def main(ctx_factory=cl.create_some_context,
snapshot_pattern="flame1d-{step:06d}-{rank:04d}.pkl",
restart_step=None,
use_profiling=False,
use_logmgr=False):
"""Drive the Y0 example."""
from mpi4py import MPI
comm = MPI.COMM_WORLD
rank = 0
rank = comm.Get_rank()
nparts = comm.Get_size()
"""logging and profiling"""
logmgr = initialize_logmgr(use_logmgr,
filename="flame1d.sqlite",
mode="wo",
mpi_comm=comm)
cl_ctx = ctx_factory()
if use_profiling:
queue = cl.CommandQueue(
cl_ctx, properties=cl.command_queue_properties.PROFILING_ENABLE)
actx = PyOpenCLProfilingArrayContext(
queue,
allocator=cl_tools.MemoryPool(cl_tools.ImmediateAllocator(queue)),
logmgr=logmgr)
else:
queue = cl.CommandQueue(cl_ctx)
actx = PyOpenCLArrayContext(queue,
allocator=cl_tools.MemoryPool(
cl_tools.ImmediateAllocator(queue)))
#nviz = 500
#nrestart = 500
nviz = 1
nrestart = 3
#current_dt = 5.0e-8 # stable with euler
current_dt = 5.0e-8 # stable with rk4
#current_dt = 4e-7 # stable with lrsrk144
t_final = 1.5e-7
dim = 2
order = 1
exittol = 1000000000000
#t_final = 0.001
current_cfl = 1.0
current_t = 0
constant_cfl = False
nstatus = 10000000000
rank = 0
checkpoint_t = current_t
current_step = 0
vel_burned = np.zeros(shape=(dim, ))
vel_unburned = np.zeros(shape=(dim, ))
# {{{ Set up initial state using Cantera
# Use Cantera for initialization
# -- Pick up a CTI for the thermochemistry config
# --- Note: Users may add their own CTI file by dropping it into
# --- mirgecom/mechanisms alongside the other CTI files.
from mirgecom.mechanisms import get_mechanism_cti
# uiuc C2H4
#mech_cti = get_mechanism_cti("uiuc")
# sanDiego H2
mech_cti = get_mechanism_cti("sanDiego")
cantera_soln = cantera.Solution(phase_id="gas", source=mech_cti)
nspecies = cantera_soln.n_species
# Initial temperature, pressure, and mixutre mole fractions are needed to
# set up the initial state in Cantera.
temp_unburned = 300.0
temp_ignition = 1500.0
# Parameters for calculating the amounts of fuel, oxidizer, and inert species
equiv_ratio = 1.0
ox_di_ratio = 0.21
# H2
stoich_ratio = 0.5
#C2H4
#stoich_ratio = 3.0
# Grab the array indices for the specific species, ethylene, oxygen, and nitrogen
# C2H4
#i_fu = cantera_soln.species_index("C2H4")
# H2
i_fu = cantera_soln.species_index("H2")
i_ox = cantera_soln.species_index("O2")
i_di = cantera_soln.species_index("N2")
x = np.zeros(nspecies)
# Set the species mole fractions according to our desired fuel/air mixture
x[i_fu] = (ox_di_ratio * equiv_ratio) / (stoich_ratio +
ox_di_ratio * equiv_ratio)
x[i_ox] = stoich_ratio * x[i_fu] / equiv_ratio
x[i_di] = (1.0 - ox_di_ratio) * x[i_ox] / ox_di_ratio
# Uncomment next line to make pylint fail when it can't find cantera.one_atm
one_atm = cantera.one_atm # pylint: disable=no-member
# one_atm = 101325.0
pres_unburned = one_atm
# Let the user know about how Cantera is being initilized
print(f"Input state (T,P,X) = ({temp_unburned}, {pres_unburned}, {x}")
# Set Cantera internal gas temperature, pressure, and mole fractios
cantera_soln.TPX = temp_unburned, pres_unburned, x
# Pull temperature, total density, mass fractions, and pressure from Cantera
# We need total density, and mass fractions to initialize the fluid/gas state.
y_unburned = np.zeros(nspecies)
can_t, rho_unburned, y_unburned = cantera_soln.TDY
can_p = cantera_soln.P
# *can_t*, *can_p* should not differ (significantly) from user's initial data,
# but we want to ensure that we use exactly the same starting point as Cantera,
# so we use Cantera's version of these data.
# now find the conditions for the burned gas
cantera_soln.equilibrate('TP')
temp_burned, rho_burned, y_burned = cantera_soln.TDY
pres_burned = cantera_soln.P
casename = "flame1d"
pyrometheus_mechanism = pyro.get_thermochem_class(cantera_soln)(actx.np)
# C2H4
mu = 1.e-5
kappa = 1.6e-5 # Pr = mu*rho/alpha = 0.75
# H2
mu = 1.e-5
kappa = mu * 0.08988 / 0.75 # Pr = mu*rho/alpha = 0.75
species_diffusivity = 1.e-5 * np.ones(nspecies)
transport_model = SimpleTransport(viscosity=mu,
thermal_conductivity=kappa,
species_diffusivity=species_diffusivity)
eos = PyrometheusMixture(pyrometheus_mechanism,
temperature_guess=temp_unburned,
transport_model=transport_model)
species_names = pyrometheus_mechanism.species_names
print(f"Pyrometheus mechanism species names {species_names}")
print(
f"Unburned state (T,P,Y) = ({temp_unburned}, {pres_unburned}, {y_unburned}"
)
print(f"Burned state (T,P,Y) = ({temp_burned}, {pres_burned}, {y_burned}")
flame_start_loc = 0.05
flame_speed = 1000
# use the burned conditions with a lower temperature
bulk_init = PlanarDiscontinuity(dim=dim,
disc_location=flame_start_loc,
sigma=0.01,
nspecies=nspecies,
temperature_left=temp_ignition,
temperature_right=temp_unburned,
pressure_left=pres_burned,
pressure_right=pres_unburned,
velocity_left=vel_burned,
velocity_right=vel_unburned,
species_mass_left=y_burned,
species_mass_right=y_unburned)
inflow_init = MixtureInitializer(dim=dim,
nspecies=nspecies,
pressure=pres_burned,
temperature=temp_ignition,
massfractions=y_burned,
velocity=vel_burned)
outflow_init = MixtureInitializer(dim=dim,
nspecies=nspecies,
pressure=pres_unburned,
temperature=temp_unburned,
massfractions=y_unburned,
velocity=vel_unburned)
inflow = PrescribedViscousBoundary(q_func=inflow_init)
outflow = PrescribedViscousBoundary(q_func=outflow_init)
wall = PrescribedViscousBoundary(
) # essentially a "dummy" use the interior solution for the exterior
from grudge import sym
boundaries = {
sym.DTAG_BOUNDARY("Inflow"): inflow,
sym.DTAG_BOUNDARY("Outflow"): outflow,
sym.DTAG_BOUNDARY("Wall"): wall
}
if restart_step is None:
char_len = 0.001
box_ll = (0.0, 0.0)
box_ur = (0.25, 0.01)
num_elements = (int((box_ur[0] - box_ll[0]) / char_len),
int((box_ur[1] - box_ll[1]) / char_len))
from meshmode.mesh.generation import generate_regular_rect_mesh
generate_mesh = partial(generate_regular_rect_mesh,
a=box_ll,
b=box_ur,
n=num_elements,
mesh_type="X",
boundary_tag_to_face={
"Inflow": ["-x"],
"Outflow": ["+x"],
"Wall": ["+y", "-y"]
})
local_mesh, global_nelements = generate_and_distribute_mesh(
comm, generate_mesh)
local_nelements = local_mesh.nelements
else: # Restart
with open(snapshot_pattern.format(step=restart_step, rank=rank),
"rb") as f:
restart_data = pickle.load(f)
local_mesh = restart_data["local_mesh"]
local_nelements = local_mesh.nelements
global_nelements = restart_data["global_nelements"]
assert comm.Get_size() == restart_data["num_parts"]
if rank == 0:
logging.info("Making discretization")
discr = EagerDGDiscretization(actx,
local_mesh,
order=order,
mpi_communicator=comm)
nodes = thaw(actx, discr.nodes())
if restart_step is None:
if rank == 0:
logging.info("Initializing soln.")
# for Discontinuity initial conditions
current_state = bulk_init(t=0., x_vec=nodes, eos=eos)
# for uniform background initial condition
#current_state = bulk_init(nodes, eos=eos)
else:
current_t = restart_data["t"]
current_step = restart_step
current_state = unflatten(
actx, discr.discr_from_dd("vol"),
obj_array_vectorize(actx.from_numpy, restart_data["state"]))
vis_timer = None
if logmgr:
logmgr_add_cl_device_info(logmgr, queue)
logmgr_add_many_discretization_quantities(logmgr, discr, dim,
extract_vars_for_logging,
units_for_logging)
logmgr.add_watches([
"step.max", "t_sim.max", "t_step.max", "t_log.max", "min_pressure",
"max_pressure", "min_temperature", "max_temperature"
])
try:
logmgr.add_watches(
["memory_usage_python.max", "memory_usage_gpu.max"])
except KeyError:
pass
if use_profiling:
logmgr.add_watches(["pyopencl_array_time.max"])
vis_timer = IntervalTimer("t_vis", "Time spent visualizing")
logmgr.add_quantity(vis_timer)
visualizer = make_visualizer(discr, order)
# initname = initializer.__class__.__name__
initname = "flame1d"
eosname = eos.__class__.__name__
init_message = make_init_message(dim=dim,
order=order,
nelements=local_nelements,
global_nelements=global_nelements,
dt=current_dt,
t_final=t_final,
nstatus=nstatus,
nviz=nviz,
cfl=current_cfl,
constant_cfl=constant_cfl,
initname=initname,
eosname=eosname,
casename=casename)
if rank == 0:
logger.info(init_message)
#timestepper = rk4_step
#timestepper = lsrk54_step
#timestepper = lsrk144_step
timestepper = euler_step
get_timestep = partial(inviscid_sim_timestep,
discr=discr,
t=current_t,
dt=current_dt,
cfl=current_cfl,
eos=eos,
t_final=t_final,
constant_cfl=constant_cfl)
def my_rhs(t, state):
# check for some troublesome output types
inf_exists = not np.isfinite(discr.norm(state, np.inf))
if inf_exists:
if rank == 0:
logging.info(
"Non-finite values detected in simulation, exiting...")
# dump right now
sim_checkpoint(discr=discr,
visualizer=visualizer,
eos=eos,
q=state,
vizname=casename,
step=999999999,
t=t,
dt=current_dt,
nviz=1,
exittol=exittol,
constant_cfl=constant_cfl,
comm=comm,
vis_timer=vis_timer,
overwrite=True,
s0=s0_sc,
kappa=kappa_sc)
exit()
cv = split_conserved(dim=dim, q=state)
return (
ns_operator(discr, q=state, t=t, boundaries=boundaries, eos=eos) +
eos.get_species_source_terms(cv))
def my_checkpoint(step, t, dt, state):
write_restart = (check_step(step, nrestart)
if step != restart_step else False)
if write_restart is True:
with open(snapshot_pattern.format(step=step, rank=rank),
"wb") as f:
pickle.dump(
{
"local_mesh": local_mesh,
"state": obj_array_vectorize(actx.to_numpy,
flatten(state)),
"t": t,
"step": step,
"global_nelements": global_nelements,
"num_parts": nparts,
}, f)
def loc_fn(t):
return flame_start_loc + flame_speed * t
exact_soln = PlanarDiscontinuity(dim=dim,
disc_location=loc_fn,
sigma=0.0000001,
nspecies=nspecies,
temperature_left=temp_ignition,
temperature_right=temp_unburned,
pressure_left=pres_burned,
pressure_right=pres_unburned,
velocity_left=vel_burned,
velocity_right=vel_unburned,
species_mass_left=y_burned,
species_mass_right=y_unburned)
cv = split_conserved(dim, state)
reaction_rates = eos.get_production_rates(cv)
viz_fields = [("reaction_rates", reaction_rates)]
return sim_checkpoint(discr=discr,
visualizer=visualizer,
eos=eos,
q=state,
vizname=casename,
step=step,
t=t,
dt=dt,
nstatus=nstatus,
nviz=nviz,
exittol=exittol,
constant_cfl=constant_cfl,
comm=comm,
vis_timer=vis_timer,
overwrite=True,
exact_soln=exact_soln,
viz_fields=viz_fields)
if rank == 0:
logging.info("Stepping.")
(current_step, current_t, current_state) = \
advance_state(rhs=my_rhs, timestepper=timestepper,
checkpoint=my_checkpoint,
get_timestep=get_timestep, state=current_state,
t_final=t_final, t=current_t, istep=current_step,
logmgr=logmgr,eos=eos,dim=dim)
if rank == 0:
logger.info("Checkpointing final state ...")
my_checkpoint(current_step,
t=current_t,
dt=(current_t - checkpoint_t),
state=current_state)
if current_t - t_final < 0:
raise ValueError("Simulation exited abnormally")
if logmgr:
logmgr.close()
elif use_profiling:
print(actx.tabulate_profiling_data())
exit()
def main(ctx_factory=cl.create_some_context, use_leap=False):
"""Drive example."""
cl_ctx = ctx_factory()
queue = cl.CommandQueue(cl_ctx)
actx = PyOpenCLArrayContext(queue,
allocator=cl_tools.MemoryPool(
cl_tools.ImmediateAllocator(queue)))
dim = 3
nel_1d = 16
order = 3
exittol = 10.0
t_final = 0.002
current_cfl = 1.0
velocity = np.zeros(shape=(dim, ))
velocity[:dim] = 1.0
current_dt = .001
current_t = 0
constant_cfl = False
nstatus = 1
nviz = 1
rank = 0
checkpoint_t = current_t
current_step = 0
if use_leap:
from leap.rk import RK4MethodBuilder
timestepper = RK4MethodBuilder("state")
else:
timestepper = rk4_step
box_ll = -5.0
box_ur = 5.0
error_state = 0
from mpi4py import MPI
comm = MPI.COMM_WORLD
rank = comm.Get_rank()
from meshmode.mesh.generation import generate_regular_rect_mesh
generate_mesh = partial(generate_regular_rect_mesh,
a=(box_ll, ) * dim,
b=(box_ur, ) * dim,
nelements_per_axis=(nel_1d, ) * dim)
local_mesh, global_nelements = generate_and_distribute_mesh(
comm, generate_mesh)
local_nelements = local_mesh.nelements
discr = EagerDGDiscretization(actx,
local_mesh,
order=order,
mpi_communicator=comm)
nodes = thaw(actx, discr.nodes())
casename = "uiuc_mixture"
# Pyrometheus initialization
from mirgecom.mechanisms import get_mechanism_cti
mech_cti = get_mechanism_cti("uiuc")
sol = cantera.Solution(phase_id="gas", source=mech_cti)
pyrometheus_mechanism = pyro.get_thermochem_class(sol)(actx.np)
nspecies = pyrometheus_mechanism.num_species
eos = PyrometheusMixture(pyrometheus_mechanism)
y0s = np.zeros(shape=(nspecies, ))
for i in range(nspecies - 1):
y0s[i] = 1.0 / (10.0**(i + 1))
spec_sum = sum([y0s[i] for i in range(nspecies - 1)])
y0s[nspecies - 1] = 1.0 - spec_sum
# Mixture defaults to STP (p, T) = (1atm, 300K)
initializer = MixtureInitializer(dim=dim,
nspecies=nspecies,
massfractions=y0s,
velocity=velocity)
boundaries = {BTAG_ALL: PrescribedBoundary(initializer)}
nodes = thaw(actx, discr.nodes())
current_state = initializer(x_vec=nodes, eos=eos)
visualizer = make_visualizer(discr)
initname = initializer.__class__.__name__
eosname = eos.__class__.__name__
init_message = make_init_message(dim=dim,
order=order,
nelements=local_nelements,
global_nelements=global_nelements,
dt=current_dt,
t_final=t_final,
nstatus=nstatus,
nviz=nviz,
cfl=current_cfl,
constant_cfl=constant_cfl,
initname=initname,
eosname=eosname,
casename=casename)
if rank == 0:
logger.info(init_message)
get_timestep = partial(inviscid_sim_timestep,
discr=discr,
t=current_t,
dt=current_dt,
cfl=current_cfl,
eos=eos,
t_final=t_final,
constant_cfl=constant_cfl)
def my_rhs(t, state):
return euler_operator(discr,
cv=state,
t=t,
boundaries=boundaries,
eos=eos)
def my_checkpoint(step, t, dt, state):
global checkpoint_t
checkpoint_t = t
return sim_checkpoint(discr,
visualizer,
eos,
cv=state,
exact_soln=initializer,
vizname=casename,
step=step,
t=t,
dt=dt,
nstatus=nstatus,
nviz=nviz,
exittol=exittol,
constant_cfl=constant_cfl,
comm=comm)
try:
(current_step, current_t, current_state) = \
advance_state(rhs=my_rhs, timestepper=timestepper,
checkpoint=my_checkpoint,
get_timestep=get_timestep, state=current_state,
t=current_t, t_final=t_final)
except ExactSolutionMismatch as ex:
error_state = 1
current_step = ex.step
current_t = ex.t
current_state = ex.state
if current_t != checkpoint_t: # This check because !overwrite
if rank == 0:
logger.info("Checkpointing final state ...")
my_checkpoint(current_step,
t=current_t,
dt=(current_t - checkpoint_t),
state=current_state)
if current_t - t_final < 0:
error_state = 1
if error_state:
raise ValueError("Simulation did not complete successfully.")
def main(ctx_factory=cl.create_some_context,
casename="flame1d",
user_input_file=None,
snapshot_pattern="{casename}-{step:06d}-{rank:04d}.pkl",
restart_step=None,
restart_name=None,
use_profiling=False,
use_logmgr=False,
use_lazy_eval=False):
"""Drive the 1D Flame example."""
from mpi4py import MPI
comm = MPI.COMM_WORLD
rank = 0
rank = comm.Get_rank()
nparts = comm.Get_size()
if restart_name is None:
restart_name = casename
"""logging and profiling"""
logmgr = initialize_logmgr(use_logmgr,
filename=(f"{casename}.sqlite"),
mode="wo",
mpi_comm=comm)
cl_ctx = ctx_factory()
if use_profiling:
if use_lazy_eval:
raise RuntimeError("Cannot run lazy with profiling.")
queue = cl.CommandQueue(
cl_ctx, properties=cl.command_queue_properties.PROFILING_ENABLE)
actx = PyOpenCLProfilingArrayContext(
queue,
allocator=cl_tools.MemoryPool(cl_tools.ImmediateAllocator(queue)),
logmgr=logmgr)
else:
queue = cl.CommandQueue(cl_ctx)
if use_lazy_eval:
actx = PytatoArrayContext(queue)
else:
actx = PyOpenCLArrayContext(
queue,
allocator=cl_tools.MemoryPool(
cl_tools.ImmediateAllocator(queue)))
# default input values that will be read from input (if they exist)
nviz = 100
nrestart = 100
nhealth = 100
nstatus = 1
current_dt = 1e-9
t_final = 1.e-3
order = 1
integrator = "rk4"
if user_input_file:
if rank == 0:
with open(user_input_file) as f:
input_data = yaml.load(f, Loader=yaml.FullLoader)
else:
input_data = None
input_data = comm.bcast(input_data, root=0)
#print(input_data)
try:
nviz = int(input_data["nviz"])
except KeyError:
pass
try:
nrestart = int(input_data["nrestart"])
except KeyError:
pass
try:
nhealth = int(input_data["nhealth"])
except KeyError:
pass
try:
nstatus = int(input_data["nstatus"])
except KeyError:
pass
try:
current_dt = float(input_data["current_dt"])
except KeyError:
pass
try:
t_final = float(input_data["t_final"])
except KeyError:
pass
try:
order = int(input_data["order"])
except KeyError:
pass
try:
integrator = input_data["integrator"]
except KeyError:
pass
# param sanity check
allowed_integrators = ["rk4", "euler", "lsrk54", "lsrk144"]
if (integrator not in allowed_integrators):
error_message = "Invalid time integrator: {}".format(integrator)
raise RuntimeError(error_message)
timestepper = rk4_step
if integrator == "euler":
timestepper = euler_step
if integrator == "lsrk54":
timestepper = lsrk54_step
if integrator == "lsrk144":
timestepper = lsrk144_step
if (rank == 0):
print(f'#### Simluation control data: ####')
print(f'\tnviz = {nviz}')
print(f'\tnrestart = {nrestart}')
print(f'\tnhealth = {nhealth}')
print(f'\tnstatus = {nstatus}')
print(f'\tcurrent_dt = {current_dt}')
print(f'\tt_final = {t_final}')
print(f'\torder = {order}')
print(f"\tTime integration {integrator}")
print(f'#### Simluation control data: ####')
restart_path = 'restart_data/'
viz_path = 'viz_data/'
#if(rank == 0):
#if not os.path.exists(restart_path):
#os.makedirs(restart_path)
#if not os.path.exists(viz_path):
#os.makedirs(viz_path)
dim = 2
exittol = .09
current_cfl = 1.0
current_t = 0
constant_cfl = False
checkpoint_t = current_t
current_step = 0
vel_burned = np.zeros(shape=(dim, ))
vel_unburned = np.zeros(shape=(dim, ))
# {{{ Set up initial state using Cantera
# Use Cantera for initialization
# -- Pick up a CTI for the thermochemistry config
# --- Note: Users may add their own CTI file by dropping it into
# --- mirgecom/mechanisms alongside the other CTI files.
fuel = "H2"
allowed_fuels = ["H2", "C2H4"]
if (fuel not in allowed_fuels):
error_message = "Invalid fuel selection: {}".format(fuel)
raise RuntimeError(error_message)
if rank == 0:
print(f"Fuel: {fuel}")
from mirgecom.mechanisms import get_mechanism_cti
if fuel == "C2H4":
mech_cti = get_mechanism_cti("uiuc")
elif fuel == "H2":
mech_cti = get_mechanism_cti("sanDiego")
cantera_soln = cantera.Solution(phase_id="gas", source=mech_cti)
nspecies = cantera_soln.n_species
# Initial temperature, pressure, and mixutre mole fractions are needed to
# set up the initial state in Cantera.
temp_unburned = 300.0
temp_ignition = 1500.0
# Parameters for calculating the amounts of fuel, oxidizer, and inert species
if fuel == "C2H4":
stoich_ratio = 3.0
if fuel == "H2":
stoich_ratio = 0.5
equiv_ratio = 1.0
ox_di_ratio = 0.21
# Grab the array indices for the specific species, ethylene, oxygen, and nitrogen
i_fu = cantera_soln.species_index(fuel)
i_ox = cantera_soln.species_index("O2")
i_di = cantera_soln.species_index("N2")
x = np.zeros(nspecies)
# Set the species mole fractions according to our desired fuel/air mixture
x[i_fu] = (ox_di_ratio * equiv_ratio) / (stoich_ratio +
ox_di_ratio * equiv_ratio)
x[i_ox] = stoich_ratio * x[i_fu] / equiv_ratio
x[i_di] = (1.0 - ox_di_ratio) * x[i_ox] / ox_di_ratio
# Uncomment next line to make pylint fail when it can't find cantera.one_atm
one_atm = cantera.one_atm # pylint: disable=no-member
# one_atm = 101325.0
pres_unburned = one_atm
# Let the user know about how Cantera is being initilized
print(f"Input state (T,P,X) = ({temp_unburned}, {pres_unburned}, {x}")
# Set Cantera internal gas temperature, pressure, and mole fractios
cantera_soln.TPX = temp_unburned, pres_unburned, x
# Pull temperature, total density, mass fractions, and pressure from Cantera
# We need total density, and mass fractions to initialize the fluid/gas state.
y_unburned = np.zeros(nspecies)
can_t, rho_unburned, y_unburned = cantera_soln.TDY
can_p = cantera_soln.P
# *can_t*, *can_p* should not differ (significantly) from user's initial data,
# but we want to ensure that we use exactly the same starting point as Cantera,
# so we use Cantera's version of these data.
# now find the conditions for the burned gas
cantera_soln.equilibrate('TP')
temp_burned, rho_burned, y_burned = cantera_soln.TDY
pres_burned = cantera_soln.P
pyrometheus_mechanism = pyro.get_thermochem_class(cantera_soln)(actx.np)
kappa = 1.6e-5 # Pr = mu*rho/alpha = 0.75
mu = 1.e-5
species_diffusivity = 1.e-5 * np.ones(nspecies)
transport_model = SimpleTransport(viscosity=mu,
thermal_conductivity=kappa,
species_diffusivity=species_diffusivity)
eos = PyrometheusMixture(pyrometheus_mechanism,
temperature_guess=temp_unburned,
transport_model=transport_model)
species_names = pyrometheus_mechanism.species_names
print(f"Pyrometheus mechanism species names {species_names}")
print(
f"Unburned state (T,P,Y) = ({temp_unburned}, {pres_unburned}, {y_unburned}"
)
print(f"Burned state (T,P,Y) = ({temp_burned}, {pres_burned}, {y_burned}")
flame_start_loc = 0.10
flame_speed = 1000
# use the burned conditions with a lower temperature
#bulk_init = PlanarDiscontinuity(dim=dim, disc_location=flame_start_loc, sigma=0.01, nspecies=nspecies,
#temperature_left=temp_ignition, temperature_right=temp_unburned,
#pressure_left=pres_burned, pressure_right=pres_unburned,
#velocity_left=vel_burned, velocity_right=vel_unburned,
#species_mass_left=y_burned, species_mass_right=y_unburned)
bulk_init = PlanarDiscontinuity(dim=dim,
disc_location=flame_start_loc,
sigma=0.0005,
nspecies=nspecies,
temperature_right=temp_ignition,
temperature_left=temp_unburned,
pressure_right=pres_burned,
pressure_left=pres_unburned,
velocity_right=vel_burned,
velocity_left=vel_unburned,
species_mass_right=y_burned,
species_mass_left=y_unburned)
inflow_init = MixtureInitializer(dim=dim,
nspecies=nspecies,
pressure=pres_burned,
temperature=temp_ignition,
massfractions=y_burned,
velocity=vel_burned)
outflow_init = MixtureInitializer(dim=dim,
nspecies=nspecies,
pressure=pres_unburned,
temperature=temp_unburned,
massfractions=y_unburned,
velocity=vel_unburned)
def symmetry(nodes, eos, cv=None, **kwargs):
dim = len(nodes)
if cv is not None:
#cv = split_conserved(dim, q)
mass = cv.mass
momentum = cv.momentum
momentum[1] = -1.0 * momentum[1]
ke = .5 * np.dot(cv.momentum, cv.momentum) / cv.mass
energy = cv.energy
species_mass = cv.species_mass
return make_conserved(dim=dim,
mass=mass,
momentum=momentum,
energy=energy,
species_mass=species_mass)
def dummy(nodes, eos, cv=None, **kwargs):
dim = len(nodes)
if cv is not None:
#cv = split_conserved(dim, q)
mass = cv.mass
momentum = cv.momentum
ke = .5 * np.dot(cv.momentum, cv.momentum) / cv.mass
energy = cv.energy
species_mass = cv.species_mass
return make_conserved(dim=dim,
mass=mass,
momentum=momentum,
energy=energy,
species_mass=species_mass)
inflow = PrescribedViscousBoundary(q_func=inflow_init)
outflow = PrescribedViscousBoundary(q_func=outflow_init)
wall_symmetry = PrescribedViscousBoundary(q_func=symmetry)
wall_dummy = PrescribedViscousBoundary(q_func=dummy)
wall = PrescribedViscousBoundary(
) # essentially a "dummy" use the interior solution for the exterior
boundaries = {
DTAG_BOUNDARY("Inflow"): inflow,
DTAG_BOUNDARY("Outflow"): outflow,
#DTAG_BOUNDARY("Wall"): wall_dummy}
DTAG_BOUNDARY("Wall"): wall_symmetry
}
if restart_step is None:
char_len = 0.0001
box_ll = (0.0, 0.0)
box_ur = (0.2, 0.00125)
num_elements = (int((box_ur[0] - box_ll[0]) / char_len),
int((box_ur[1] - box_ll[1]) / char_len))
from meshmode.mesh.generation import generate_regular_rect_mesh
generate_mesh = partial(generate_regular_rect_mesh,
a=box_ll,
b=box_ur,
n=num_elements,
boundary_tag_to_face={
"Inflow": ["+x"],
"Outflow": ["-x"],
"Wall": ["+y", "-y"]
})
local_mesh, global_nelements = generate_and_distribute_mesh(
comm, generate_mesh)
local_nelements = local_mesh.nelements
else: # Restart
from mirgecom.restart import read_restart_data
restart_file = restart_path + snapshot_pattern.format(
casename=restart_name, step=restart_step, rank=rank)
restart_data = read_restart_data(actx, restart_file)
local_mesh = restart_data["local_mesh"]
local_nelements = local_mesh.nelements
global_nelements = restart_data["global_nelements"]
assert comm.Get_size() == restart_data["num_parts"]
if rank == 0:
logging.info("Making discretization")
discr = EagerDGDiscretization(actx,
local_mesh,
order=order,
mpi_communicator=comm)
nodes = thaw(actx, discr.nodes())
if restart_step is None:
if rank == 0:
logging.info("Initializing soln.")
# for Discontinuity initial conditions
current_state = bulk_init(x_vec=nodes, eos=eos, time=0.)
# for uniform background initial condition
#current_state = bulk_init(nodes, eos=eos)
else:
current_t = restart_data["t"]
current_step = restart_step
#current_state = make_fluid_restart_state(actx, discr.discr_from_dd("vol"), restart_data["state"])
current_state = restart_data["state"]
vis_timer = None
log_cfl = LogUserQuantity(name="cfl", value=current_cfl)
if logmgr:
logmgr_add_cl_device_info(logmgr, queue)
logmgr_add_many_discretization_quantities(logmgr, discr, dim,
extract_vars_for_logging,
units_for_logging)
logmgr_set_time(logmgr, current_step, current_t)
logmgr.add_quantity(log_cfl, interval=nstatus)
#logmgr_add_package_versions(logmgr)
logmgr.add_watches([
("step.max", "step = {value}, "),
("t_sim.max", "sim time: {value:1.6e} s, "),
("cfl.max", "cfl = {value:1.4f}\n"),
("min_pressure", "------- P (min, max) (Pa) = ({value:1.9e}, "),
("max_pressure", "{value:1.9e})\n"),
("min_temperature", "------- T (min, max) (K) = ({value:7g}, "),
("max_temperature", "{value:7g})\n"),
("t_step.max", "------- step walltime: {value:6g} s, "),
("t_log.max", "log walltime: {value:6g} s")
])
try:
logmgr.add_watches(["memory_usage.max"])
except KeyError:
pass
if use_profiling:
logmgr.add_watches(["pyopencl_array_time.max"])
vis_timer = IntervalTimer("t_vis", "Time spent visualizing")
logmgr.add_quantity(vis_timer)
visualizer = make_visualizer(discr)
initname = "flame1d"
eosname = eos.__class__.__name__
init_message = make_init_message(dim=dim,
order=order,
nelements=local_nelements,
global_nelements=global_nelements,
dt=current_dt,
t_final=t_final,
nstatus=nstatus,
nviz=nviz,
cfl=current_cfl,
constant_cfl=constant_cfl,
initname=initname,
eosname=eosname,
casename=casename)
if rank == 0:
logger.info(init_message)
get_timestep = partial(inviscid_sim_timestep,
discr=discr,
t=current_t,
dt=current_dt,
cfl=current_cfl,
eos=eos,
t_final=t_final,
constant_cfl=constant_cfl)
def my_rhs(t, state):
return (
ns_operator(discr, cv=state, t=t, boundaries=boundaries, eos=eos) +
eos.get_species_source_terms(cv=state))
def my_checkpoint(step, t, dt, state, force=False):
do_health = force or check_step(step, nhealth) and step > 0
do_viz = force or check_step(step, nviz)
do_restart = force or check_step(step, nrestart)
do_status = force or check_step(step, nstatus)
if do_viz or do_health:
dv = eos.dependent_vars(state)
errors = False
if do_health:
health_message = ""
if check_naninf_local(discr, "vol", dv.pressure):
errors = True
health_message += "Invalid pressure data found.\n"
elif check_range_local(discr,
"vol",
dv.pressure,
min_value=1,
max_value=2.e6):
errors = True
health_message += "Pressure data failed health check.\n"
errors = comm.allreduce(errors, MPI.LOR)
if errors:
if rank == 0:
logger.info("Fluid solution failed health check.")
if health_message:
logger.info(f"{rank=}: {health_message}")
#if check_step(step, nrestart) and step != restart_step and not errors:
if do_restart or errors:
filename = restart_path + snapshot_pattern.format(
step=step, rank=rank, casename=casename)
restart_dictionary = {
"local_mesh": local_mesh,
"order": order,
"state": state,
"t": t,
"step": step,
"global_nelements": global_nelements,
"num_parts": nparts
}
write_restart_file(actx, restart_dictionary, filename, comm)
if do_status or do_viz or errors:
local_cfl = get_inviscid_cfl(discr, eos=eos, dt=dt, cv=state)
max_cfl = nodal_max(discr, "vol", local_cfl)
log_cfl.set_quantity(max_cfl)
#if ((check_step(step, nviz) and step != restart_step) or errors):
if do_viz or errors:
def loc_fn(t):
return flame_start_loc + flame_speed * t
#exact_soln = PlanarDiscontinuity(dim=dim, disc_location=loc_fn,
#sigma=0.0000001, nspecies=nspecies,
#temperature_left=temp_ignition, temperature_right=temp_unburned,
#pressure_left=pres_burned, pressure_right=pres_unburned,
#velocity_left=vel_burned, velocity_right=vel_unburned,
#species_mass_left=y_burned, species_mass_right=y_unburned)
reaction_rates = eos.get_production_rates(cv=state)
# conserved quantities
viz_fields = [
#("cv", state),
("CV_rho", state.mass),
("CV_rhoU", state.momentum[0]),
("CV_rhoV", state.momentum[1]),
("CV_rhoE", state.energy)
]
# species mass fractions
viz_fields.extend(
("Y_" + species_names[i], state.species_mass[i] / state.mass)
for i in range(nspecies))
# dependent variables
viz_fields.extend([
("DV", eos.dependent_vars(state)),
#("exact_soln", exact_soln),
("reaction_rates", reaction_rates),
("cfl", local_cfl)
])
write_visfile(discr,
viz_fields,
visualizer,
vizname=viz_path + casename,
step=step,
t=t,
overwrite=True,
vis_timer=vis_timer)
if errors:
raise RuntimeError("Error detected by user checkpoint, exiting.")
if rank == 0:
logging.info("Stepping.")
(current_step, current_t, current_state) = \
advance_state(rhs=my_rhs, timestepper=timestepper,
checkpoint=my_checkpoint,
get_timestep=get_timestep, state=current_state,
t_final=t_final, t=current_t, istep=current_step,
logmgr=logmgr,eos=eos,dim=dim)
if rank == 0:
logger.info("Checkpointing final state ...")
my_checkpoint(current_step,
t=current_t,
dt=(current_t - checkpoint_t),
state=current_state,
force=True)
if logmgr:
logmgr.close()
elif use_profiling:
print(actx.tabulate_profiling_data())
exit()
def test_pyrometheus_mechanisms(ctx_factory, mechname, rate_tol, y0):
"""Test known pyrometheus mechanisms.
This test reproduces a pyrometheus-native test in the MIRGE context.
Tests that the Pyrometheus mechanism code gets the same thermo properties as the
corresponding mechanism in Cantera.
"""
cl_ctx = ctx_factory()
queue = cl.CommandQueue(cl_ctx)
actx = PyOpenCLArrayContext(queue)
dim = 1
nel_1d = 2
from meshmode.mesh.generation import generate_regular_rect_mesh
mesh = generate_regular_rect_mesh(a=(-0.5, ) * dim,
b=(0.5, ) * dim,
nelements_per_axis=(nel_1d, ) * dim)
order = 4
logger.info(f"Number of elements {mesh.nelements}")
discr = EagerDGDiscretization(actx, mesh, order=order)
# Pyrometheus initialization
mech_cti = get_mechanism_cti(mechname)
sol = cantera.Solution(phase_id="gas", source=mech_cti)
prometheus_mechanism = pyro.get_thermochem_class(sol)(actx.np)
nspecies = prometheus_mechanism.num_species
print(f"PyrometheusMixture::NumSpecies = {nspecies}")
press0 = 101500.0
temp0 = 300.0
y0s = np.zeros(shape=(nspecies, ))
for i in range(nspecies - 1):
y0s[i] = y0 / (10.0**(i + 1))
y0s[-1] = 1.0 - np.sum(y0s[:-1])
for fac in range(1, 11):
pressin = fac * press0
tempin = fac * temp0
print(f"Testing (t,P) = ({tempin}, {pressin})")
cantera_soln = cantera.Solution(phase_id="gas", source=mech_cti)
cantera_soln.TPY = tempin, pressin, y0s
cantera_soln.equilibrate("UV")
can_t, can_rho, can_y = cantera_soln.TDY
can_p = cantera_soln.P
can_e = cantera_soln.int_energy_mass
can_k = cantera_soln.forward_rate_constants
can_c = cantera_soln.concentrations
# Chemistry functions for testing pyro chem
can_r = cantera_soln.net_rates_of_progress
can_omega = cantera_soln.net_production_rates
ones = discr.zeros(actx) + 1.0
tin = can_t * ones
pin = can_p * ones
yin = make_obj_array([can_y[i] * ones for i in range(nspecies)])
prom_rho = prometheus_mechanism.get_density(pin, tin, yin)
prom_e = prometheus_mechanism.get_mixture_internal_energy_mass(
tin, yin)
prom_t = prometheus_mechanism.get_temperature(prom_e, tin, yin, True)
prom_p = prometheus_mechanism.get_pressure(prom_rho, tin, yin)
prom_c = prometheus_mechanism.get_concentrations(prom_rho, yin)
prom_k = prometheus_mechanism.get_fwd_rate_coefficients(prom_t, prom_c)
# Pyro chemistry functions
prom_r = prometheus_mechanism.get_net_rates_of_progress(prom_t, prom_c)
prom_omega = prometheus_mechanism.get_net_production_rates(
prom_rho, prom_t, yin)
print(f"can(rho, y, p, t, e, k) = ({can_rho}, {can_y}, "
f"{can_p}, {can_t}, {can_e}, {can_k})")
print(f"prom(rho, y, p, t, e, k) = ({prom_rho}, {y0s}, "
f"{prom_p}, {prom_t}, {prom_e}, {prom_k})")
# For pyro chem testing
print(f"can_r = {can_r}")
print(f"prom_r = {prom_r}")
print(f"can_omega = {can_omega}")
print(f"prom_omega = {prom_omega}")
assert discr.norm((prom_c - can_c) / can_c, np.inf) < 1e-14
assert discr.norm((prom_t - can_t) / can_t, np.inf) < 1e-14
assert discr.norm((prom_rho - can_rho) / can_rho, np.inf) < 1e-14
assert discr.norm((prom_p - can_p) / can_p, np.inf) < 1e-14
assert discr.norm((prom_e - can_e) / can_e, np.inf) < 1e-6
assert discr.norm((prom_k - can_k) / can_k, np.inf) < 1e-10
# Pyro chem test comparisons
for i, rate in enumerate(can_r):
assert discr.norm((prom_r[i] - rate), np.inf) < rate_tol
for i, rate in enumerate(can_omega):
assert discr.norm((prom_omega[i] - rate), np.inf) < rate_tol
def main(ctx_factory=cl.create_some_context,
use_logmgr=True,
use_leap=False,
use_overintegration=False,
use_profiling=False,
casename=None,
rst_filename=None,
actx_class=PyOpenCLArrayContext,
log_dependent=True):
"""Drive example."""
cl_ctx = ctx_factory()
if casename is None:
casename = "mirgecom"
from mpi4py import MPI
comm = MPI.COMM_WORLD
rank = comm.Get_rank()
nproc = comm.Get_size()
from mirgecom.simutil import global_reduce as _global_reduce
global_reduce = partial(_global_reduce, comm=comm)
logmgr = initialize_logmgr(use_logmgr,
filename=f"{casename}.sqlite",
mode="wu",
mpi_comm=comm)
if use_profiling:
queue = cl.CommandQueue(
cl_ctx, properties=cl.command_queue_properties.PROFILING_ENABLE)
else:
queue = cl.CommandQueue(cl_ctx)
actx = actx_class(queue,
allocator=cl_tools.MemoryPool(
cl_tools.ImmediateAllocator(queue)))
# Some discretization parameters
dim = 2
nel_1d = 8
order = 1
# {{{ Time stepping control
# This example runs only 3 steps by default (to keep CI ~short)
# With the mixture defined below, equilibrium is achieved at ~40ms
# To run to equilibrium, set t_final >= 40ms.
# Time stepper selection
if use_leap:
from leap.rk import RK4MethodBuilder
timestepper = RK4MethodBuilder("state")
else:
timestepper = rk4_step
# Time loop control parameters
current_step = 0
t_final = 1e-8
current_cfl = 1.0
current_dt = 1e-9
current_t = 0
constant_cfl = False
# i.o frequencies
nstatus = 1
nviz = 5
nhealth = 1
nrestart = 5
# }}} Time stepping control
debug = False
rst_path = "restart_data/"
rst_pattern = (rst_path + "{cname}-{step:04d}-{rank:04d}.pkl")
if rst_filename: # read the grid from restart data
rst_filename = f"{rst_filename}-{rank:04d}.pkl"
from mirgecom.restart import read_restart_data
restart_data = read_restart_data(actx, rst_filename)
local_mesh = restart_data["local_mesh"]
local_nelements = local_mesh.nelements
global_nelements = restart_data["global_nelements"]
assert restart_data["num_parts"] == nproc
rst_time = restart_data["t"]
rst_step = restart_data["step"]
rst_order = restart_data["order"]
else: # generate the grid from scratch
from meshmode.mesh.generation import generate_regular_rect_mesh
box_ll = -0.005
box_ur = 0.005
generate_mesh = partial(generate_regular_rect_mesh,
a=(box_ll, ) * dim,
b=(box_ur, ) * dim,
nelements_per_axis=(nel_1d, ) * dim)
local_mesh, global_nelements = generate_and_distribute_mesh(
comm, generate_mesh)
local_nelements = local_mesh.nelements
from grudge.dof_desc import DISCR_TAG_BASE, DISCR_TAG_QUAD
from meshmode.discretization.poly_element import \
default_simplex_group_factory, QuadratureSimplexGroupFactory
discr = EagerDGDiscretization(
actx,
local_mesh,
discr_tag_to_group_factory={
DISCR_TAG_BASE:
default_simplex_group_factory(base_dim=local_mesh.dim,
order=order),
DISCR_TAG_QUAD:
QuadratureSimplexGroupFactory(2 * order + 1)
},
mpi_communicator=comm)
nodes = thaw(discr.nodes(), actx)
ones = discr.zeros(actx) + 1.0
if use_overintegration:
quadrature_tag = DISCR_TAG_QUAD
else:
quadrature_tag = None
ones = discr.zeros(actx) + 1.0
vis_timer = None
if logmgr:
logmgr_add_cl_device_info(logmgr, queue)
logmgr_add_device_memory_usage(logmgr, queue)
vis_timer = IntervalTimer("t_vis", "Time spent visualizing")
logmgr.add_quantity(vis_timer)
logmgr.add_watches([("step.max", "step = {value}, "),
("t_sim.max", "sim time: {value:1.6e} s\n"),
("t_step.max",
"------- step walltime: {value:6g} s, "),
("t_log.max", "log walltime: {value:6g} s")])
if log_dependent:
logmgr_add_many_discretization_quantities(
logmgr, discr, dim, extract_vars_for_logging,
units_for_logging)
logmgr.add_watches([
("min_pressure",
"\n------- P (min, max) (Pa) = ({value:1.9e}, "),
("max_pressure", "{value:1.9e})\n"),
("min_temperature",
"------- T (min, max) (K) = ({value:7g}, "),
("max_temperature", "{value:7g})\n")
])
# {{{ Set up initial state using Cantera
# Use Cantera for initialization
# -- Pick up a CTI for the thermochemistry config
# --- Note: Users may add their own CTI file by dropping it into
# --- mirgecom/mechanisms alongside the other CTI files.
from mirgecom.mechanisms import get_mechanism_cti
mech_cti = get_mechanism_cti("uiuc")
cantera_soln = cantera.Solution(phase_id="gas", source=mech_cti)
nspecies = cantera_soln.n_species
# Initial temperature, pressure, and mixutre mole fractions are needed to
# set up the initial state in Cantera.
temperature_seed = 1500.0 # Initial temperature hot enough to burn
# Parameters for calculating the amounts of fuel, oxidizer, and inert species
equiv_ratio = 1.0
ox_di_ratio = 0.21
stoich_ratio = 3.0
# Grab the array indices for the specific species, ethylene, oxygen, and nitrogen
i_fu = cantera_soln.species_index("C2H4")
i_ox = cantera_soln.species_index("O2")
i_di = cantera_soln.species_index("N2")
x = np.zeros(nspecies)
# Set the species mole fractions according to our desired fuel/air mixture
x[i_fu] = (ox_di_ratio * equiv_ratio) / (stoich_ratio +
ox_di_ratio * equiv_ratio)
x[i_ox] = stoich_ratio * x[i_fu] / equiv_ratio
x[i_di] = (1.0 - ox_di_ratio) * x[i_ox] / ox_di_ratio
# Uncomment next line to make pylint fail when it can't find cantera.one_atm
one_atm = cantera.one_atm # pylint: disable=no-member
# one_atm = 101325.0
# Let the user know about how Cantera is being initilized
print(f"Input state (T,P,X) = ({temperature_seed}, {one_atm}, {x}")
# Set Cantera internal gas temperature, pressure, and mole fractios
cantera_soln.TPX = temperature_seed, one_atm, x
# Pull temperature, total density, mass fractions, and pressure from Cantera
# We need total density, and mass fractions to initialize the fluid/gas state.
can_t, can_rho, can_y = cantera_soln.TDY
can_p = cantera_soln.P
# *can_t*, *can_p* should not differ (significantly) from user's initial data,
# but we want to ensure that we use exactly the same starting point as Cantera,
# so we use Cantera's version of these data.
# }}}
# {{{ Create Pyrometheus thermochemistry object & EOS
# Create a Pyrometheus EOS with the Cantera soln. Pyrometheus uses Cantera and
# generates a set of methods to calculate chemothermomechanical properties and
# states for this particular mechanism.
from mirgecom.thermochemistry import make_pyrometheus_mechanism_class
pyro_mechanism = make_pyrometheus_mechanism_class(cantera_soln)(actx.np)
eos = PyrometheusMixture(pyro_mechanism,
temperature_guess=temperature_seed)
gas_model = GasModel(eos=eos)
from pytools.obj_array import make_obj_array
def get_temperature_update(cv, temperature):
y = cv.species_mass_fractions
e = gas_model.eos.internal_energy(cv) / cv.mass
return pyro_mechanism.get_temperature_update_energy(e, temperature, y)
from mirgecom.gas_model import make_fluid_state
def get_fluid_state(cv, tseed):
return make_fluid_state(cv=cv,
gas_model=gas_model,
temperature_seed=tseed)
compute_temperature_update = actx.compile(get_temperature_update)
construct_fluid_state = actx.compile(get_fluid_state)
# }}}
# {{{ MIRGE-Com state initialization
# Initialize the fluid/gas state with Cantera-consistent data:
# (density, pressure, temperature, mass_fractions)
print(f"Cantera state (rho,T,P,Y) = ({can_rho}, {can_t}, {can_p}, {can_y}")
velocity = np.zeros(shape=(dim, ))
initializer = MixtureInitializer(dim=dim,
nspecies=nspecies,
pressure=can_p,
temperature=can_t,
massfractions=can_y,
velocity=velocity)
my_boundary = AdiabaticSlipBoundary()
boundaries = {BTAG_ALL: my_boundary}
if rst_filename:
current_step = rst_step
current_t = rst_time
if logmgr:
from mirgecom.logging_quantities import logmgr_set_time
logmgr_set_time(logmgr, current_step, current_t)
if order == rst_order:
current_cv = restart_data["cv"]
temperature_seed = restart_data["temperature_seed"]
else:
rst_cv = restart_data["cv"]
old_discr = EagerDGDiscretization(actx,
local_mesh,
order=rst_order,
mpi_communicator=comm)
from meshmode.discretization.connection import make_same_mesh_connection
connection = make_same_mesh_connection(
actx, discr.discr_from_dd("vol"),
old_discr.discr_from_dd("vol"))
current_cv = connection(rst_cv)
temperature_seed = connection(restart_data["temperature_seed"])
else:
# Set the current state from time 0
current_cv = initializer(eos=gas_model.eos, x_vec=nodes)
temperature_seed = temperature_seed * ones
# The temperature_seed going into this function is:
# - At time 0: the initial temperature input data (maybe from Cantera)
# - On restart: the restarted temperature seed from restart file (saving
# the *seed* allows restarts to be deterministic
current_fluid_state = construct_fluid_state(current_cv, temperature_seed)
current_dv = current_fluid_state.dv
temperature_seed = current_dv.temperature
# Inspection at physics debugging time
if debug:
print("Initial MIRGE-Com state:")
print(f"Initial DV pressure: {current_fluid_state.pressure}")
print(f"Initial DV temperature: {current_fluid_state.temperature}")
# }}}
visualizer = make_visualizer(discr)
initname = initializer.__class__.__name__
eosname = gas_model.eos.__class__.__name__
init_message = make_init_message(dim=dim,
order=order,
nelements=local_nelements,
global_nelements=global_nelements,
dt=current_dt,
t_final=t_final,
nstatus=nstatus,
nviz=nviz,
cfl=current_cfl,
constant_cfl=constant_cfl,
initname=initname,
eosname=eosname,
casename=casename)
# Cantera equilibrate calculates the expected end state @ chemical equilibrium
# i.e. the expected state after all reactions
cantera_soln.equilibrate("UV")
eq_temperature, eq_density, eq_mass_fractions = cantera_soln.TDY
eq_pressure = cantera_soln.P
# Report the expected final state to the user
if rank == 0:
logger.info(init_message)
logger.info(f"Expected equilibrium state:"
f" {eq_pressure=}, {eq_temperature=},"
f" {eq_density=}, {eq_mass_fractions=}")
def my_write_status(dt, cfl, dv=None):
status_msg = f"------ {dt=}" if constant_cfl else f"----- {cfl=}"
if ((dv is not None) and (not log_dependent)):
temp = dv.temperature
press = dv.pressure
from grudge.op import nodal_min_loc, nodal_max_loc
tmin = allsync(actx.to_numpy(nodal_min_loc(discr, "vol", temp)),
comm=comm,
op=MPI.MIN)
tmax = allsync(actx.to_numpy(nodal_max_loc(discr, "vol", temp)),
comm=comm,
op=MPI.MAX)
pmin = allsync(actx.to_numpy(nodal_min_loc(discr, "vol", press)),
comm=comm,
op=MPI.MIN)
pmax = allsync(actx.to_numpy(nodal_max_loc(discr, "vol", press)),
comm=comm,
op=MPI.MAX)
dv_status_msg = f"\nP({pmin}, {pmax}), T({tmin}, {tmax})"
status_msg = status_msg + dv_status_msg
if rank == 0:
logger.info(status_msg)
def my_write_viz(step, t, dt, state, ts_field, dv, production_rates, cfl):
viz_fields = [("cv", state), ("dv", dv),
("production_rates", production_rates),
("dt" if constant_cfl else "cfl", ts_field)]
write_visfile(discr,
viz_fields,
visualizer,
vizname=casename,
step=step,
t=t,
overwrite=True,
vis_timer=vis_timer)
def my_write_restart(step, t, state, temperature_seed):
rst_fname = rst_pattern.format(cname=casename, step=step, rank=rank)
if rst_fname == rst_filename:
if rank == 0:
logger.info("Skipping overwrite of restart file.")
else:
rst_data = {
"local_mesh": local_mesh,
"cv": state.cv,
"temperature_seed": temperature_seed,
"t": t,
"step": step,
"order": order,
"global_nelements": global_nelements,
"num_parts": nproc
}
from mirgecom.restart import write_restart_file
write_restart_file(actx, rst_data, rst_fname, comm)
def my_health_check(cv, dv):
import grudge.op as op
health_error = False
pressure = dv.pressure
temperature = dv.temperature
from mirgecom.simutil import check_naninf_local, check_range_local
if check_naninf_local(discr, "vol", pressure):
health_error = True
logger.info(f"{rank=}: Invalid pressure data found.")
if check_range_local(discr, "vol", pressure, 1e5, 2.6e5):
health_error = True
logger.info(f"{rank=}: Pressure range violation.")
if check_naninf_local(discr, "vol", temperature):
health_error = True
logger.info(f"{rank=}: Invalid temperature data found.")
if check_range_local(discr, "vol", temperature, 1.498e3, 1.6e3):
health_error = True
logger.info(f"{rank=}: Temperature range violation.")
# This check is the temperature convergence check
# The current *temperature* is what Pyrometheus gets
# after a fixed number of Newton iterations, *n_iter*.
# Calling `compute_temperature` here with *temperature*
# input as the guess returns the calculated gas temperature after
# yet another *n_iter*.
# The difference between those two temperatures is the
# temperature residual, which can be used as an indicator of
# convergence in Pyrometheus `get_temperature`.
# Note: The local max jig below works around a very long compile
# in lazy mode.
temp_resid = compute_temperature_update(cv, temperature) / temperature
temp_err = (actx.to_numpy(op.nodal_max_loc(discr, "vol", temp_resid)))
if temp_err > 1e-8:
health_error = True
logger.info(
f"{rank=}: Temperature is not converged {temp_resid=}.")
return health_error
from mirgecom.inviscid import get_inviscid_timestep
def get_dt(state):
return get_inviscid_timestep(discr, state=state)
compute_dt = actx.compile(get_dt)
from mirgecom.inviscid import get_inviscid_cfl
def get_cfl(state, dt):
return get_inviscid_cfl(discr, dt=dt, state=state)
compute_cfl = actx.compile(get_cfl)
def get_production_rates(cv, temperature):
return eos.get_production_rates(cv, temperature)
compute_production_rates = actx.compile(get_production_rates)
def my_get_timestep(t, dt, state):
# richer interface to calculate {dt,cfl} returns node-local estimates
t_remaining = max(0, t_final - t)
if constant_cfl:
ts_field = current_cfl * compute_dt(state)
from grudge.op import nodal_min_loc
dt = allsync(actx.to_numpy(nodal_min_loc(discr, "vol", ts_field)),
comm=comm,
op=MPI.MIN)
cfl = current_cfl
else:
ts_field = compute_cfl(state, current_dt)
from grudge.op import nodal_max_loc
cfl = allsync(actx.to_numpy(nodal_max_loc(discr, "vol", ts_field)),
comm=comm,
op=MPI.MAX)
return ts_field, cfl, min(t_remaining, dt)
def my_pre_step(step, t, dt, state):
cv, tseed = state
fluid_state = construct_fluid_state(cv, tseed)
dv = fluid_state.dv
try:
if logmgr:
logmgr.tick_before()
from mirgecom.simutil import check_step
do_viz = check_step(step=step, interval=nviz)
do_restart = check_step(step=step, interval=nrestart)
do_health = check_step(step=step, interval=nhealth)
do_status = check_step(step=step, interval=nstatus)
if do_health:
health_errors = global_reduce(my_health_check(cv, dv),
op="lor")
if health_errors:
if rank == 0:
logger.info("Fluid solution failed health check.")
raise MyRuntimeError("Failed simulation health check.")
ts_field, cfl, dt = my_get_timestep(t=t, dt=dt, state=fluid_state)
if do_status:
my_write_status(dt=dt, cfl=cfl, dv=dv)
if do_restart:
my_write_restart(step=step,
t=t,
state=fluid_state,
temperature_seed=tseed)
if do_viz:
production_rates = compute_production_rates(
fluid_state.cv, fluid_state.temperature)
my_write_viz(step=step,
t=t,
dt=dt,
state=cv,
dv=dv,
production_rates=production_rates,
ts_field=ts_field,
cfl=cfl)
except MyRuntimeError:
if rank == 0:
logger.info("Errors detected; attempting graceful exit.")
# my_write_viz(step=step, t=t, dt=dt, state=cv)
# my_write_restart(step=step, t=t, state=fluid_state)
raise
return state, dt
def my_post_step(step, t, dt, state):
cv, tseed = state
fluid_state = construct_fluid_state(cv, tseed)
# Logmgr needs to know about EOS, dt, dim?
# imo this is a design/scope flaw
if logmgr:
set_dt(logmgr, dt)
set_sim_state(logmgr, dim, cv, gas_model.eos)
logmgr.tick_after()
return make_obj_array([cv, fluid_state.temperature]), dt
def my_rhs(t, state):
cv, tseed = state
from mirgecom.gas_model import make_fluid_state
fluid_state = make_fluid_state(cv=cv,
gas_model=gas_model,
temperature_seed=tseed)
return make_obj_array([
euler_operator(discr,
state=fluid_state,
time=t,
boundaries=boundaries,
gas_model=gas_model,
quadrature_tag=quadrature_tag) +
eos.get_species_source_terms(cv, fluid_state.temperature),
0 * tseed
])
current_dt = get_sim_timestep(discr, current_fluid_state, current_t,
current_dt, current_cfl, t_final,
constant_cfl)
current_step, current_t, current_state = \
advance_state(rhs=my_rhs, timestepper=timestepper,
pre_step_callback=my_pre_step,
post_step_callback=my_post_step, dt=current_dt,
state=make_obj_array([current_cv, temperature_seed]),
t=current_t, t_final=t_final)
# Dump the final data
if rank == 0:
logger.info("Checkpointing final state ...")
final_cv, tseed = current_state
final_fluid_state = construct_fluid_state(final_cv, tseed)
final_dv = final_fluid_state.dv
final_dm = compute_production_rates(final_cv, final_dv.temperature)
ts_field, cfl, dt = my_get_timestep(t=current_t,
dt=current_dt,
state=final_fluid_state)
my_write_viz(step=current_step,
t=current_t,
dt=dt,
state=final_cv,
dv=final_dv,
production_rates=final_dm,
ts_field=ts_field,
cfl=cfl)
my_write_status(dt=dt, cfl=cfl, dv=final_dv)
my_write_restart(step=current_step,
t=current_t,
state=final_fluid_state,
temperature_seed=tseed)
if logmgr:
logmgr.close()
elif use_profiling:
print(actx.tabulate_profiling_data())
finish_tol = 1e-16
assert np.abs(current_t - t_final) < finish_tol
def test_pyrometheus_eos(ctx_factory, mechname, dim, y0, vel):
"""Test PyrometheusMixture EOS for all available mechanisms.
Tests that the PyrometheusMixture EOS gets the same thermo properties
(p, T, e) as the Pyrometheus-native mechanism code.
"""
cl_ctx = ctx_factory()
queue = cl.CommandQueue(cl_ctx)
actx = PyOpenCLArrayContext(queue)
nel_1d = 4
from meshmode.mesh.generation import generate_regular_rect_mesh
mesh = generate_regular_rect_mesh(a=(-0.5, ) * dim,
b=(0.5, ) * dim,
nelements_per_axis=(nel_1d, ) * dim)
order = 4
logger.info(f"Number of elements {mesh.nelements}")
discr = EagerDGDiscretization(actx, mesh, order=order)
nodes = thaw(actx, discr.nodes())
# Pyrometheus initialization
mech_cti = get_mechanism_cti(mechname)
sol = cantera.Solution(phase_id="gas", source=mech_cti)
prometheus_mechanism = pyro.get_thermochem_class(sol)(actx.np)
nspecies = prometheus_mechanism.num_species
print(f"PrometheusMixture::Mechanism = {mechname}")
print(f"PrometheusMixture::NumSpecies = {nspecies}")
press0 = 101500.0
temp0 = 300.0
y0s = np.zeros(shape=(nspecies, ))
for i in range(1, nspecies):
y0s[i] = y0 / (10.0**i)
y0s[0] = 1.0 - np.sum(y0s[1:])
velocity = vel * np.ones(shape=(dim, ))
for fac in range(1, 11):
tempin = fac * temp0
pressin = fac * press0
print(f"Testing {mechname}(t,P) = ({tempin}, {pressin})")
ones = discr.zeros(actx) + 1.0
tin = tempin * ones
pin = pressin * ones
yin = y0s * ones
tguess = 300.0
pyro_rho = prometheus_mechanism.get_density(pin, tin, yin)
pyro_e = prometheus_mechanism.get_mixture_internal_energy_mass(
tin, yin)
pyro_t = prometheus_mechanism.get_temperature(pyro_e, tguess, yin,
True)
pyro_p = prometheus_mechanism.get_pressure(pyro_rho, pyro_t, yin)
print(f"prom(rho, y, p, t, e) = ({pyro_rho}, {y0s}, "
f"{pyro_p}, {pyro_t}, {pyro_e})")
eos = PyrometheusMixture(prometheus_mechanism)
initializer = MixtureInitializer(dim=dim,
nspecies=nspecies,
pressure=pyro_p,
temperature=pyro_t,
massfractions=y0s,
velocity=velocity)
cv = initializer(eos=eos, t=0, x_vec=nodes)
p = eos.pressure(cv)
temperature = eos.temperature(cv)
internal_energy = eos.get_internal_energy(tin, yin)
y = eos.species_fractions(cv)
print(f"pyro_y = {y}")
print(f"pyro_eos.p = {p}")
print(f"pyro_eos.temp = {temperature}")
print(f"pyro_eos.e = {internal_energy}")
tol = 1e-14
assert discr.norm((cv.mass - pyro_rho) / pyro_rho, np.inf) < tol
assert discr.norm((temperature - pyro_t) / pyro_t, np.inf) < tol
assert discr.norm((internal_energy - pyro_e) / pyro_e, np.inf) < tol
assert discr.norm((p - pyro_p) / pyro_p, np.inf) < tol
def test_pyrometheus_kinetics(ctx_factory, mechname, rate_tol, y0):
"""Test known pyrometheus reaction mechanisms.
This test reproduces a pyrometheus-native test in the MIRGE context.
Tests that the Pyrometheus mechanism code gets the same chemical properties
and reaction rates as the corresponding mechanism in Cantera. The reactions
are integrated in time and verified against a homogeneous reactor in
Cantera.
"""
cl_ctx = ctx_factory()
queue = cl.CommandQueue(cl_ctx)
actx = PyOpenCLArrayContext(queue)
dim = 1
nel_1d = 4
from meshmode.mesh.generation import generate_regular_rect_mesh
mesh = generate_regular_rect_mesh(a=(-0.5, ) * dim,
b=(0.5, ) * dim,
nelements_per_axis=(nel_1d, ) * dim)
order = 4
logger.info(f"Number of elements {mesh.nelements}")
discr = EagerDGDiscretization(actx, mesh, order=order)
ones = discr.zeros(actx) + 1.0
# Pyrometheus initialization
mech_cti = get_mechanism_cti(mechname)
cantera_soln = cantera.Solution(phase_id="gas", source=mech_cti)
pyro_obj = pyro.get_thermochem_class(cantera_soln)(actx.np)
nspecies = pyro_obj.num_species
print(f"PrometheusMixture::NumSpecies = {nspecies}")
tempin = 1500.0
pressin = cantera.one_atm
print(f"Testing (t,P) = ({tempin}, {pressin})")
# Homogeneous reactor to get test data
equiv_ratio = 1.0
ox_di_ratio = 0.21
stoich_ratio = 0.5
i_fu = cantera_soln.species_index("H2")
i_ox = cantera_soln.species_index("O2")
i_di = cantera_soln.species_index("N2")
x = np.zeros(shape=(nspecies, ))
x[i_fu] = (ox_di_ratio * equiv_ratio) / (stoich_ratio +
ox_di_ratio * equiv_ratio)
x[i_ox] = stoich_ratio * x[i_fu] / equiv_ratio
x[i_di] = (1.0 - ox_di_ratio) * x[i_ox] / ox_di_ratio
cantera_soln.TPX = tempin, pressin, x
# cantera_soln.equilibrate("UV")
can_t, can_rho, can_y = cantera_soln.TDY
# can_p = cantera_soln.P
reactor = cantera.IdealGasConstPressureReactor(cantera_soln)
sim = cantera.ReactorNet([reactor])
time = 0.0
for _ in range(50):
time += 1.0e-6
sim.advance(time)
# Cantera kinetics
can_r = reactor.kinetics.net_rates_of_progress
can_omega = reactor.kinetics.net_production_rates
# Get state from Cantera
can_t = reactor.T
can_rho = reactor.density
can_y = reactor.Y
print(f"can_y = {can_y}")
tin = can_t * ones
rhoin = can_rho * ones
yin = can_y * ones
# Prometheus kinetics
pyro_c = pyro_obj.get_concentrations(rhoin, yin)
print(f"pyro_conc = {pyro_c}")
pyro_r = pyro_obj.get_net_rates_of_progress(tin, pyro_c)
pyro_omega = pyro_obj.get_net_production_rates(rhoin, tin, yin)
# Print
print(f"can_r = {can_r}")
print(f"pyro_r = {pyro_r}")
abs_diff = discr.norm(pyro_r - can_r, np.inf)
if abs_diff > 1e-14:
min_r = (np.abs(can_r)).min()
if min_r > 0:
assert discr.norm((pyro_r - can_r) / can_r, np.inf) < rate_tol
else:
assert discr.norm(pyro_r, np.inf) < rate_tol
print(f"can_omega = {can_omega}")
print(f"pyro_omega = {pyro_omega}")
for i, omega in enumerate(can_omega):
omin = np.abs(omega).min()
if omin > 1e-12:
assert discr.norm(
(pyro_omega[i] - omega) / omega, np.inf) < 1e-8
else:
assert discr.norm(pyro_omega[i], np.inf) < 1e-12
def main(ctx_factory=cl.create_some_context, use_logmgr=True,
use_leap=False, use_profiling=False, casename=None,
rst_filename=None, actx_class=PyOpenCLArrayContext,
log_dependent=True):
"""Drive example."""
cl_ctx = ctx_factory()
if casename is None:
casename = "mirgecom"
from mpi4py import MPI
comm = MPI.COMM_WORLD
rank = comm.Get_rank()
nparts = comm.Get_size()
from mirgecom.simutil import global_reduce as _global_reduce
global_reduce = partial(_global_reduce, comm=comm)
logmgr = initialize_logmgr(use_logmgr,
filename=f"{casename}.sqlite", mode="wu", mpi_comm=comm)
if use_profiling:
queue = cl.CommandQueue(
cl_ctx, properties=cl.command_queue_properties.PROFILING_ENABLE)
else:
queue = cl.CommandQueue(cl_ctx)
actx = actx_class(
queue,
allocator=cl_tools.MemoryPool(cl_tools.ImmediateAllocator(queue)))
# timestepping control
if use_leap:
from leap.rk import RK4MethodBuilder
timestepper = RK4MethodBuilder("state")
else:
timestepper = rk4_step
t_final = 1e-8
current_cfl = 1.0
current_dt = 1e-9
current_t = 0
current_step = 0
constant_cfl = False
# some i/o frequencies
nstatus = 1
nhealth = 1
nrestart = 5
nviz = 1
dim = 2
rst_path = "restart_data/"
rst_pattern = (
rst_path + "{cname}-{step:04d}-{rank:04d}.pkl"
)
if rst_filename: # read the grid from restart data
rst_filename = f"{rst_filename}-{rank:04d}.pkl"
from mirgecom.restart import read_restart_data
restart_data = read_restart_data(actx, rst_filename)
local_mesh = restart_data["local_mesh"]
local_nelements = local_mesh.nelements
global_nelements = restart_data["global_nelements"]
assert restart_data["num_parts"] == nparts
else: # generate the grid from scratch
nel_1d = 16
box_ll = -5.0
box_ur = 5.0
from meshmode.mesh.generation import generate_regular_rect_mesh
generate_mesh = partial(generate_regular_rect_mesh, a=(box_ll,)*dim,
b=(box_ur,) * dim, nelements_per_axis=(nel_1d,)*dim)
local_mesh, global_nelements = generate_and_distribute_mesh(comm,
generate_mesh)
local_nelements = local_mesh.nelements
order = 3
discr = EagerDGDiscretization(
actx, local_mesh, order=order, mpi_communicator=comm
)
nodes = thaw(discr.nodes(), actx)
vis_timer = None
if logmgr:
logmgr_add_device_name(logmgr, queue)
logmgr_add_device_memory_usage(logmgr, queue)
vis_timer = IntervalTimer("t_vis", "Time spent visualizing")
logmgr.add_quantity(vis_timer)
logmgr.add_watches([
("step.max", "step = {value}, "),
("t_sim.max", "sim time: {value:1.6e} s\n"),
("t_step.max", "------- step walltime: {value:6g} s, "),
("t_log.max", "log walltime: {value:6g} s")
])
if log_dependent:
logmgr_add_many_discretization_quantities(logmgr, discr, dim,
extract_vars_for_logging,
units_for_logging)
logmgr.add_watches([
("min_pressure", "\n------- P (min, max) (Pa) = ({value:1.9e}, "),
("max_pressure", "{value:1.9e})\n"),
("min_temperature", "------- T (min, max) (K) = ({value:7g}, "),
("max_temperature", "{value:7g})\n")])
# Pyrometheus initialization
from mirgecom.mechanisms import get_mechanism_cti
mech_cti = get_mechanism_cti("uiuc")
sol = cantera.Solution(phase_id="gas", source=mech_cti)
from mirgecom.thermochemistry import make_pyrometheus_mechanism_class
pyrometheus_mechanism = make_pyrometheus_mechanism_class(sol)(actx.np)
nspecies = pyrometheus_mechanism.num_species
eos = PyrometheusMixture(pyrometheus_mechanism)
from mirgecom.gas_model import GasModel, make_fluid_state
gas_model = GasModel(eos=eos)
from pytools.obj_array import make_obj_array
y0s = np.zeros(shape=(nspecies,))
for i in range(nspecies-1):
y0s[i] = 1.0 / (10.0 ** (i + 1))
spec_sum = sum([y0s[i] for i in range(nspecies-1)])
y0s[nspecies-1] = 1.0 - spec_sum
# Mixture defaults to STP (p, T) = (1atm, 300K)
velocity = np.zeros(shape=(dim,)) + 1.0
initializer = MixtureInitializer(dim=dim, nspecies=nspecies,
massfractions=y0s, velocity=velocity)
def boundary_solution(discr, btag, gas_model, state_minus, **kwargs):
actx = state_minus.array_context
bnd_discr = discr.discr_from_dd(btag)
nodes = thaw(bnd_discr.nodes(), actx)
return make_fluid_state(initializer(x_vec=nodes, eos=gas_model.eos,
**kwargs), gas_model,
temperature_seed=state_minus.temperature)
boundaries = {
BTAG_ALL: PrescribedFluidBoundary(boundary_state_func=boundary_solution)
}
if rst_filename:
current_t = restart_data["t"]
current_step = restart_data["step"]
current_cv = restart_data["cv"]
tseed = restart_data["temperature_seed"]
if logmgr:
from mirgecom.logging_quantities import logmgr_set_time
logmgr_set_time(logmgr, current_step, current_t)
else:
# Set the current state from time 0
current_cv = initializer(x_vec=nodes, eos=eos)
tseed = 300.0
current_state = make_fluid_state(current_cv, gas_model, temperature_seed=tseed)
visualizer = make_visualizer(discr)
initname = initializer.__class__.__name__
eosname = eos.__class__.__name__
init_message = make_init_message(dim=dim, order=order,
nelements=local_nelements,
global_nelements=global_nelements,
dt=current_dt, t_final=t_final, nstatus=nstatus,
nviz=nviz, cfl=current_cfl,
constant_cfl=constant_cfl, initname=initname,
eosname=eosname, casename=casename)
if rank == 0:
logger.info(init_message)
def my_write_status(component_errors, dv=None):
from mirgecom.simutil import allsync
status_msg = (
"------- errors="
+ ", ".join("%.3g" % en for en in component_errors))
if ((dv is not None) and (not log_dependent)):
temp = dv.temperature
press = dv.pressure
from grudge.op import nodal_min_loc, nodal_max_loc
tmin = allsync(actx.to_numpy(nodal_min_loc(discr, "vol", temp)),
comm=comm, op=MPI.MIN)
tmax = allsync(actx.to_numpy(nodal_max_loc(discr, "vol", temp)),
comm=comm, op=MPI.MAX)
pmin = allsync(actx.to_numpy(nodal_min_loc(discr, "vol", press)),
comm=comm, op=MPI.MIN)
pmax = allsync(actx.to_numpy(nodal_max_loc(discr, "vol", press)),
comm=comm, op=MPI.MAX)
dv_status_msg = f"\nP({pmin}, {pmax}), T({tmin}, {tmax})"
status_msg = status_msg + dv_status_msg
if rank == 0:
logger.info(status_msg)
if rank == 0:
logger.info(status_msg)
def my_write_viz(step, t, state, dv, exact=None, resid=None):
if exact is None:
exact = initializer(x_vec=nodes, eos=eos, time=t)
if resid is None:
resid = state - exact
viz_fields = [("cv", state), ("dv", dv)]
from mirgecom.simutil import write_visfile
write_visfile(discr, viz_fields, visualizer, vizname=casename,
step=step, t=t, overwrite=True, vis_timer=vis_timer)
def my_write_restart(step, t, state, tseed):
rst_fname = rst_pattern.format(cname=casename, step=step, rank=rank)
if rst_fname != rst_filename:
rst_data = {
"local_mesh": local_mesh,
"cv": state,
"temperature_seed": tseed,
"t": t,
"step": step,
"order": order,
"global_nelements": global_nelements,
"num_parts": nparts
}
from mirgecom.restart import write_restart_file
write_restart_file(actx, rst_data, rst_fname, comm)
def my_health_check(dv, component_errors):
health_error = False
from mirgecom.simutil import check_naninf_local, check_range_local
if check_naninf_local(discr, "vol", dv.pressure) \
or check_range_local(discr, "vol", dv.pressure, 1e5, 1.1e5):
health_error = True
logger.info(f"{rank=}: Invalid pressure data found.")
exittol = .09
if max(component_errors) > exittol:
health_error = True
if rank == 0:
logger.info("Solution diverged from exact soln.")
return health_error
def my_pre_step(step, t, dt, state):
cv, tseed = state
fluid_state = make_fluid_state(cv, gas_model, temperature_seed=tseed)
dv = fluid_state.dv
try:
exact = None
component_errors = None
if logmgr:
logmgr.tick_before()
from mirgecom.simutil import check_step
do_viz = check_step(step=step, interval=nviz)
do_restart = check_step(step=step, interval=nrestart)
do_health = check_step(step=step, interval=nhealth)
do_status = check_step(step=step, interval=nstatus)
if do_health:
exact = initializer(x_vec=nodes, eos=eos, time=t)
from mirgecom.simutil import compare_fluid_solutions
component_errors = compare_fluid_solutions(discr, cv, exact)
health_errors = global_reduce(
my_health_check(dv, component_errors), op="lor")
if health_errors:
if rank == 0:
logger.info("Fluid solution failed health check.")
raise MyRuntimeError("Failed simulation health check.")
if do_restart:
my_write_restart(step=step, t=t, state=cv, tseed=tseed)
if do_viz:
if exact is None:
exact = initializer(x_vec=nodes, eos=eos, time=t)
resid = state - exact
my_write_viz(step=step, t=t, state=cv, dv=dv, exact=exact,
resid=resid)
if do_status:
if component_errors is None:
if exact is None:
exact = initializer(x_vec=nodes, eos=eos, time=t)
from mirgecom.simutil import compare_fluid_solutions
component_errors = compare_fluid_solutions(discr, cv, exact)
my_write_status(component_errors, dv=dv)
except MyRuntimeError:
if rank == 0:
logger.info("Errors detected; attempting graceful exit.")
my_write_viz(step=step, t=t, state=cv, dv=dv)
my_write_restart(step=step, t=t, state=cv, tseed=tseed)
raise
dt = get_sim_timestep(discr, fluid_state, t, dt, current_cfl, t_final,
constant_cfl)
return state, dt
def my_post_step(step, t, dt, state):
cv, tseed = state
fluid_state = make_fluid_state(cv, gas_model, temperature_seed=tseed)
tseed = fluid_state.temperature
# Logmgr needs to know about EOS, dt, dim?
# imo this is a design/scope flaw
if logmgr:
set_dt(logmgr, dt)
set_sim_state(logmgr, dim, cv, eos)
logmgr.tick_after()
return make_obj_array([fluid_state.cv, tseed]), dt
def my_rhs(t, state):
cv, tseed = state
fluid_state = make_fluid_state(cv, gas_model, temperature_seed=tseed)
return make_obj_array(
[euler_operator(discr, state=fluid_state, time=t,
boundaries=boundaries, gas_model=gas_model),
0*tseed])
current_dt = get_sim_timestep(discr, current_state, current_t, current_dt,
current_cfl, t_final, constant_cfl)
current_step, current_t, advanced_state = \
advance_state(rhs=my_rhs, timestepper=timestepper,
pre_step_callback=my_pre_step,
post_step_callback=my_post_step, dt=current_dt,
state=make_obj_array([current_state.cv,
current_state.temperature]),
t=current_t, t_final=t_final, eos=eos, dim=dim)
# Dump the final data
if rank == 0:
logger.info("Checkpointing final state ...")
current_cv, tseed = advanced_state
current_state = make_fluid_state(current_cv, gas_model, temperature_seed=tseed)
final_dv = current_state.dv
final_exact = initializer(x_vec=nodes, eos=eos, time=current_t)
final_resid = current_state.cv - final_exact
my_write_viz(step=current_step, t=current_t, state=current_cv, dv=final_dv,
exact=final_exact, resid=final_resid)
my_write_restart(step=current_step, t=current_t, state=current_state.cv,
tseed=tseed)
if logmgr:
logmgr.close()
elif use_profiling:
print(actx.tabulate_profiling_data())
finish_tol = 1e-16
assert np.abs(current_t - t_final) < finish_tol
def run_init(
ctx_factory=cl.create_some_context,
snapshot_pattern="flame1d-{step:06d}-{rank:04d}.pkl",
):
"""Drive the Y0 example."""
from mpi4py import MPI
comm = MPI.COMM_WORLD
rank = 0
rank = comm.Get_rank()
nparts = comm.Get_size()
cl_ctx = ctx_factory()
queue = cl.CommandQueue(cl_ctx)
actx = PyOpenCLArrayContext(queue,
allocator=cl_tools.MemoryPool(
cl_tools.ImmediateAllocator(queue)))
dim = 2
order = 1
vel_burned = np.zeros(shape=(dim, ))
vel_unburned = np.zeros(shape=(dim, ))
# {{{ Set up initial state using Cantera
# Use Cantera for initialization
# -- Pick up a CTI for the thermochemistry config
# --- Note: Users may add their own CTI file by dropping it into
# --- mirgecom/mechanisms alongside the other CTI files.
from mirgecom.mechanisms import get_mechanism_cti
# uiuc C2H4
#mech_cti = get_mechanism_cti("uiuc")
# sanDiego H2
mech_cti = get_mechanism_cti("sanDiego")
cantera_soln = cantera.Solution(phase_id="gas", source=mech_cti)
nspecies = cantera_soln.n_species
# Initial temperature, pressure, and mixutre mole fractions are needed to
# set up the initial state in Cantera.
temp_unburned = 300.0
temp_ignition = 1500.0
# Parameters for calculating the amounts of fuel, oxidizer, and inert species
equiv_ratio = 1.0
ox_di_ratio = 0.21
# H2
stoich_ratio = 0.5
#C2H4
#stoich_ratio = 3.0
# Grab the array indices for the specific species, ethylene, oxygen, and nitrogen
# C2H4
#i_fu = cantera_soln.species_index("C2H4")
# H2
i_fu = cantera_soln.species_index("H2")
i_ox = cantera_soln.species_index("O2")
i_di = cantera_soln.species_index("N2")
x = np.zeros(nspecies)
# Set the species mole fractions according to our desired fuel/air mixture
x[i_fu] = (ox_di_ratio * equiv_ratio) / (stoich_ratio +
ox_di_ratio * equiv_ratio)
x[i_ox] = stoich_ratio * x[i_fu] / equiv_ratio
x[i_di] = (1.0 - ox_di_ratio) * x[i_ox] / ox_di_ratio
# Uncomment next line to make pylint fail when it can't find cantera.one_atm
one_atm = cantera.one_atm # pylint: disable=no-member
# one_atm = 101325.0
pres_unburned = one_atm
# Let the user know about how Cantera is being initilized
print(f"Input state (T,P,X) = ({temp_unburned}, {pres_unburned}, {x}")
# Set Cantera internal gas temperature, pressure, and mole fractios
cantera_soln.TPX = temp_unburned, pres_unburned, x
# Pull temperature, total density, mass fractions, and pressure from Cantera
# We need total density, and mass fractions to initialize the fluid/gas state.
y_unburned = np.zeros(nspecies)
can_t, rho_unburned, y_unburned = cantera_soln.TDY
can_p = cantera_soln.P
# *can_t*, *can_p* should not differ (significantly) from user's initial data,
# but we want to ensure that we use exactly the same starting point as Cantera,
# so we use Cantera's version of these data.
# now find the conditions for the burned gas
cantera_soln.equilibrate('TP')
temp_burned, rho_burned, y_burned = cantera_soln.TDY
pres_burned = cantera_soln.P
casename = "flame1d"
pyrometheus_mechanism = pyro.get_thermochem_class(cantera_soln)(actx.np)
# C2H4
mu = 1.e-5
kappa = 1.6e-5 # Pr = mu*rho/alpha = 0.75
# H2
mu = 1.e-5
kappa = mu * 0.08988 / 0.75 # Pr = mu*rho/alpha = 0.75
species_diffusivity = 1.e-5 * np.ones(nspecies)
transport_model = SimpleTransport(viscosity=mu,
thermal_conductivity=kappa,
species_diffusivity=species_diffusivity)
eos = PyrometheusMixture(pyrometheus_mechanism,
temperature_guess=temp_unburned,
transport_model=transport_model)
species_names = pyrometheus_mechanism.species_names
print(f"Pyrometheus mechanism species names {species_names}")
print(
f"Unburned state (T,P,Y) = ({temp_unburned}, {pres_unburned}, {y_unburned}"
)
print(f"Burned state (T,P,Y) = ({temp_burned}, {pres_burned}, {y_burned}")
flame_start_loc = 0.05
flame_speed = 1000
# use the burned conditions with a lower temperature
bulk_init = PlanarDiscontinuity(dim=dim,
disc_location=flame_start_loc,
sigma=0.01,
nspecies=nspecies,
temperature_left=temp_ignition,
temperature_right=temp_unburned,
pressure_left=pres_burned,
pressure_right=pres_unburned,
velocity_left=vel_burned,
velocity_right=vel_unburned,
species_mass_left=y_burned,
species_mass_right=y_unburned)
char_len = 0.001
box_ll = (0.0, 0.0)
box_ur = (0.25, 0.01)
num_elements = (int((box_ur[0] - box_ll[0]) / char_len),
int((box_ur[1] - box_ll[1]) / char_len))
from meshmode.mesh.generation import generate_regular_rect_mesh
generate_mesh = partial(generate_regular_rect_mesh,
a=box_ll,
b=box_ur,
n=num_elements,
mesh_type="X",
boundary_tag_to_face={
"Inflow": ["-x"],
"Outflow": ["+x"],
"Wall": ["+y", "-y"]
})
local_mesh, global_nelements = generate_and_distribute_mesh(
comm, generate_mesh)
local_nelements = local_mesh.nelements
discr = EagerDGDiscretization(actx,
local_mesh,
order=order,
mpi_communicator=comm)
nodes = thaw(actx, discr.nodes())
# for Discontinuity initial conditions
state = bulk_init(t=0., x_vec=nodes, eos=eos)
# for uniform background initial condition
#current_state = bulk_init(nodes, eos=eos)
visualizer = make_visualizer(discr, order)
with open(snapshot_pattern.format(step=0, rank=rank), "wb") as f:
pickle.dump(
{
"local_mesh": local_mesh,
"state": obj_array_vectorize(actx.to_numpy, flatten(state)),
"t": 0.,
"step": 0,
"global_nelements": global_nelements,
"num_parts": nparts,
}, f)
cv = split_conserved(dim, state)
reaction_rates = eos.get_production_rates(cv)
viz_fields = [("reaction_rates", reaction_rates)]
sim_checkpoint(discr=discr,
visualizer=visualizer,
eos=eos,
q=state,
vizname=casename,
nviz=0,
comm=comm,
overwrite=True,
viz_fields=viz_fields)
exit()
def main(ctx_factory=cl.create_some_context,
use_logmgr=True,
use_leap=False,
use_profiling=False,
casename=None,
rst_filename=None,
actx_class=PyOpenCLArrayContext):
"""Drive example."""
cl_ctx = ctx_factory()
if casename is None:
casename = "mirgecom"
from mpi4py import MPI
comm = MPI.COMM_WORLD
rank = comm.Get_rank()
nproc = comm.Get_size()
logmgr = initialize_logmgr(use_logmgr,
filename=f"{casename}.sqlite",
mode="wu",
mpi_comm=comm)
if use_profiling:
queue = cl.CommandQueue(
cl_ctx, properties=cl.command_queue_properties.PROFILING_ENABLE)
else:
queue = cl.CommandQueue(cl_ctx)
actx = actx_class(queue,
allocator=cl_tools.MemoryPool(
cl_tools.ImmediateAllocator(queue)))
# Some discretization parameters
dim = 2
nel_1d = 8
order = 1
# {{{ Time stepping control
# This example runs only 3 steps by default (to keep CI ~short)
# With the mixture defined below, equilibrium is achieved at ~40ms
# To run to equlibrium, set t_final >= 40ms.
# Time stepper selection
if use_leap:
from leap.rk import RK4MethodBuilder
timestepper = RK4MethodBuilder("state")
else:
timestepper = rk4_step
# Time loop control parameters
current_step = 0
t_final = 1e-8
current_cfl = 1.0
current_dt = 1e-9
current_t = 0
constant_cfl = False
# i.o frequencies
nstatus = 1
nviz = 5
nhealth = 1
nrestart = 5
# }}} Time stepping control
debug = False
rst_path = "restart_data/"
rst_pattern = (rst_path + "{cname}-{step:04d}-{rank:04d}.pkl")
if rst_filename: # read the grid from restart data
rst_filename = f"{rst_filename}-{rank:04d}.pkl"
from mirgecom.restart import read_restart_data
restart_data = read_restart_data(actx, rst_filename)
local_mesh = restart_data["local_mesh"]
local_nelements = local_mesh.nelements
global_nelements = restart_data["global_nelements"]
assert restart_data["num_parts"] == nproc
rst_time = restart_data["t"]
rst_step = restart_data["step"]
rst_order = restart_data["order"]
else: # generate the grid from scratch
from meshmode.mesh.generation import generate_regular_rect_mesh
box_ll = -0.005
box_ur = 0.005
generate_mesh = partial(generate_regular_rect_mesh,
a=(box_ll, ) * dim,
b=(box_ur, ) * dim,
nelements_per_axis=(nel_1d, ) * dim)
local_mesh, global_nelements = generate_and_distribute_mesh(
comm, generate_mesh)
local_nelements = local_mesh.nelements
discr = EagerDGDiscretization(actx,
local_mesh,
order=order,
mpi_communicator=comm)
nodes = thaw(actx, discr.nodes())
vis_timer = None
if logmgr:
logmgr_add_device_name(logmgr, queue)
logmgr_add_device_memory_usage(logmgr, queue)
logmgr_add_many_discretization_quantities(logmgr, discr, dim,
extract_vars_for_logging,
units_for_logging)
vis_timer = IntervalTimer("t_vis", "Time spent visualizing")
logmgr.add_quantity(vis_timer)
logmgr.add_watches([
("step.max", "step = {value}, "),
("t_sim.max", "sim time: {value:1.6e} s\n"),
("min_pressure", "------- P (min, max) (Pa) = ({value:1.9e}, "),
("max_pressure", "{value:1.9e})\n"),
("min_temperature", "------- T (min, max) (K) = ({value:7g}, "),
("max_temperature", "{value:7g})\n"),
("t_step.max", "------- step walltime: {value:6g} s, "),
("t_log.max", "log walltime: {value:6g} s")
])
# {{{ Set up initial state using Cantera
# Use Cantera for initialization
# -- Pick up a CTI for the thermochemistry config
# --- Note: Users may add their own CTI file by dropping it into
# --- mirgecom/mechanisms alongside the other CTI files.
from mirgecom.mechanisms import get_mechanism_cti
mech_cti = get_mechanism_cti("uiuc")
cantera_soln = cantera.Solution(phase_id="gas", source=mech_cti)
nspecies = cantera_soln.n_species
# Initial temperature, pressure, and mixutre mole fractions are needed to
# set up the initial state in Cantera.
init_temperature = 1500.0 # Initial temperature hot enough to burn
# Parameters for calculating the amounts of fuel, oxidizer, and inert species
equiv_ratio = 1.0
ox_di_ratio = 0.21
stoich_ratio = 3.0
# Grab the array indices for the specific species, ethylene, oxygen, and nitrogen
i_fu = cantera_soln.species_index("C2H4")
i_ox = cantera_soln.species_index("O2")
i_di = cantera_soln.species_index("N2")
x = np.zeros(nspecies)
# Set the species mole fractions according to our desired fuel/air mixture
x[i_fu] = (ox_di_ratio * equiv_ratio) / (stoich_ratio +
ox_di_ratio * equiv_ratio)
x[i_ox] = stoich_ratio * x[i_fu] / equiv_ratio
x[i_di] = (1.0 - ox_di_ratio) * x[i_ox] / ox_di_ratio
# Uncomment next line to make pylint fail when it can't find cantera.one_atm
one_atm = cantera.one_atm # pylint: disable=no-member
# one_atm = 101325.0
# Let the user know about how Cantera is being initilized
print(f"Input state (T,P,X) = ({init_temperature}, {one_atm}, {x}")
# Set Cantera internal gas temperature, pressure, and mole fractios
cantera_soln.TPX = init_temperature, one_atm, x
# Pull temperature, total density, mass fractions, and pressure from Cantera
# We need total density, and mass fractions to initialize the fluid/gas state.
can_t, can_rho, can_y = cantera_soln.TDY
can_p = cantera_soln.P
# *can_t*, *can_p* should not differ (significantly) from user's initial data,
# but we want to ensure that we use exactly the same starting point as Cantera,
# so we use Cantera's version of these data.
# }}}
# {{{ Create Pyrometheus thermochemistry object & EOS
# Create a Pyrometheus EOS with the Cantera soln. Pyrometheus uses Cantera and
# generates a set of methods to calculate chemothermomechanical properties and
# states for this particular mechanism.
pyrometheus_mechanism = pyro.get_thermochem_class(cantera_soln)(actx.np)
eos = PyrometheusMixture(pyrometheus_mechanism,
temperature_guess=init_temperature)
# }}}
# {{{ MIRGE-Com state initialization
# Initialize the fluid/gas state with Cantera-consistent data:
# (density, pressure, temperature, mass_fractions)
print(f"Cantera state (rho,T,P,Y) = ({can_rho}, {can_t}, {can_p}, {can_y}")
velocity = np.zeros(shape=(dim, ))
initializer = MixtureInitializer(dim=dim,
nspecies=nspecies,
pressure=can_p,
temperature=can_t,
massfractions=can_y,
velocity=velocity)
my_boundary = AdiabaticSlipBoundary()
boundaries = {BTAG_ALL: my_boundary}
if rst_filename:
current_step = rst_step
current_t = rst_time
if logmgr:
from mirgecom.logging_quantities import logmgr_set_time
logmgr_set_time(logmgr, current_step, current_t)
if order == rst_order:
current_state = restart_data["state"]
else:
rst_state = restart_data["state"]
old_discr = EagerDGDiscretization(actx,
local_mesh,
order=rst_order,
mpi_communicator=comm)
from meshmode.discretization.connection import make_same_mesh_connection
connection = make_same_mesh_connection(
actx, discr.discr_from_dd("vol"),
old_discr.discr_from_dd("vol"))
current_state = connection(rst_state)
else:
# Set the current state from time 0
current_state = initializer(eos=eos, x_vec=nodes)
# Inspection at physics debugging time
if debug:
print("Initial MIRGE-Com state:")
print(f"{current_state=}")
print(f"Initial DV pressure: {eos.pressure(current_state)}")
print(f"Initial DV temperature: {eos.temperature(current_state)}")
# }}}
visualizer = make_visualizer(discr)
initname = initializer.__class__.__name__
eosname = eos.__class__.__name__
init_message = make_init_message(dim=dim,
order=order,
nelements=local_nelements,
global_nelements=global_nelements,
dt=current_dt,
t_final=t_final,
nstatus=nstatus,
nviz=nviz,
cfl=current_cfl,
constant_cfl=constant_cfl,
initname=initname,
eosname=eosname,
casename=casename)
# Cantera equilibrate calculates the expected end state @ chemical equilibrium
# i.e. the expected state after all reactions
cantera_soln.equilibrate("UV")
eq_temperature, eq_density, eq_mass_fractions = cantera_soln.TDY
eq_pressure = cantera_soln.P
# Report the expected final state to the user
if rank == 0:
logger.info(init_message)
logger.info(f"Expected equilibrium state:"
f" {eq_pressure=}, {eq_temperature=},"
f" {eq_density=}, {eq_mass_fractions=}")
def my_write_status(dt, cfl):
status_msg = f"------ {dt=}" if constant_cfl else f"----- {cfl=}"
if rank == 0:
logger.info(status_msg)
def my_write_viz(step,
t,
dt,
state,
ts_field=None,
dv=None,
production_rates=None,
cfl=None):
if dv is None:
dv = eos.dependent_vars(state)
if production_rates is None:
production_rates = eos.get_production_rates(state)
if ts_field is None:
ts_field, cfl, dt = my_get_timestep(t=t, dt=dt, state=state)
viz_fields = [("cv", state), ("dv", dv),
("production_rates", production_rates),
("dt" if constant_cfl else "cfl", ts_field)]
write_visfile(discr,
viz_fields,
visualizer,
vizname=casename,
step=step,
t=t,
overwrite=True,
vis_timer=vis_timer)
def my_write_restart(step, t, state):
rst_fname = rst_pattern.format(cname=casename, step=step, rank=rank)
if rst_fname == rst_filename:
if rank == 0:
logger.info("Skipping overwrite of restart file.")
else:
rst_data = {
"local_mesh": local_mesh,
"state": state,
"t": t,
"step": step,
"order": order,
"global_nelements": global_nelements,
"num_parts": nproc
}
from mirgecom.restart import write_restart_file
write_restart_file(actx, rst_data, rst_fname, comm)
def my_health_check(dv):
health_error = False
from mirgecom.simutil import check_naninf_local, check_range_local
if check_naninf_local(discr, "vol", dv.pressure) \
or check_range_local(discr, "vol", dv.pressure, 1e5, 2.4e5):
health_error = True
logger.info(f"{rank=}: Invalid pressure data found.")
if check_range_local(discr, "vol", dv.temperature, 1.498e3, 1.52e3):
health_error = True
logger.info(f"{rank=}: Invalid temperature data found.")
return health_error
def my_get_timestep(t, dt, state):
# richer interface to calculate {dt,cfl} returns node-local estimates
t_remaining = max(0, t_final - t)
if constant_cfl:
from mirgecom.inviscid import get_inviscid_timestep
ts_field = current_cfl * get_inviscid_timestep(
discr, eos=eos, cv=state)
from grudge.op import nodal_min
dt = nodal_min(discr, "vol", ts_field)
cfl = current_cfl
else:
from mirgecom.inviscid import get_inviscid_cfl
ts_field = get_inviscid_cfl(discr, eos=eos, dt=dt, cv=state)
from grudge.op import nodal_max
cfl = nodal_max(discr, "vol", ts_field)
return ts_field, cfl, min(t_remaining, dt)
def my_pre_step(step, t, dt, state):
try:
dv = None
if logmgr:
logmgr.tick_before()
from mirgecom.simutil import check_step
do_viz = check_step(step=step, interval=nviz)
do_restart = check_step(step=step, interval=nrestart)
do_health = check_step(step=step, interval=nhealth)
do_status = check_step(step=step, interval=nstatus)
if do_health:
dv = eos.dependent_vars(state)
from mirgecom.simutil import allsync
health_errors = allsync(my_health_check(dv), comm, op=MPI.LOR)
if health_errors:
if rank == 0:
logger.info("Fluid solution failed health check.")
raise MyRuntimeError("Failed simulation health check.")
ts_field, cfl, dt = my_get_timestep(t=t, dt=dt, state=state)
if do_status:
my_write_status(dt, cfl)
if do_restart:
my_write_restart(step=step, t=t, state=state)
if do_viz:
production_rates = eos.get_production_rates(state)
if dv is None:
dv = eos.dependent_vars(state)
my_write_viz(step=step,
t=t,
dt=dt,
state=state,
dv=dv,
production_rates=production_rates,
ts_field=ts_field,
cfl=cfl)
except MyRuntimeError:
if rank == 0:
logger.info("Errors detected; attempting graceful exit.")
my_write_viz(step=step, t=t, dt=dt, state=state)
my_write_restart(step=step, t=t, state=state)
raise
return state, dt
def my_post_step(step, t, dt, state):
# Logmgr needs to know about EOS, dt, dim?
# imo this is a design/scope flaw
if logmgr:
set_dt(logmgr, dt)
set_sim_state(logmgr, dim, state, eos)
logmgr.tick_after()
return state, dt
def my_rhs(t, state):
return (euler_operator(
discr, cv=state, time=t, boundaries=boundaries, eos=eos) +
eos.get_species_source_terms(state))
current_dt = get_sim_timestep(discr, current_state, current_t, current_dt,
current_cfl, eos, t_final, constant_cfl)
current_step, current_t, current_state = \
advance_state(rhs=my_rhs, timestepper=timestepper,
pre_step_callback=my_pre_step,
post_step_callback=my_post_step, dt=current_dt,
state=current_state, t=current_t, t_final=t_final)
# Dump the final data
if rank == 0:
logger.info("Checkpointing final state ...")
final_dv = eos.dependent_vars(current_state)
final_dm = eos.get_production_rates(current_state)
ts_field, cfl, dt = my_get_timestep(t=current_t,
dt=current_dt,
state=current_state)
my_write_viz(step=current_step,
t=current_t,
dt=dt,
state=current_state,
dv=final_dv,
production_rates=final_dm,
ts_field=ts_field,
cfl=cfl)
my_write_status(dt=dt, cfl=cfl)
my_write_restart(step=current_step, t=current_t, state=current_state)
if logmgr:
logmgr.close()
elif use_profiling:
print(actx.tabulate_profiling_data())
finish_tol = 1e-16
assert np.abs(current_t - t_final) < finish_tol
def test_cti_reader():
"""Quick test of CTI reader."""
test_cti = get_mechanism_cti("uiuc")
first_line = test_cti.partition("\n")[0].strip()
assert first_line == "# CH4_BFER mechanisme: CH4 + 1.5 O2 => CO +2H2O"
def main(ctx_factory=cl.create_some_context,
casename="autoignition",
use_leap=False,
restart_step=None,
restart_name=None):
"""Drive example."""
cl_ctx = ctx_factory()
queue = cl.CommandQueue(cl_ctx)
actx = PyOpenCLArrayContext(queue,
allocator=cl_tools.MemoryPool(
cl_tools.ImmediateAllocator(queue)))
dim = 2
nel_1d = 8
order = 1
# This example runs only 3 steps by default (to keep CI ~short)
# With the mixture defined below, equilibrium is achieved at ~40ms
# To run to equlibrium, set t_final >= 40ms.
t_final = 1e-8
current_cfl = 1.0
velocity = np.zeros(shape=(dim, ))
current_dt = 1e-9
current_t = 0
constant_cfl = False
nstatus = 1
nviz = 5
nrestart = 5
rank = 0
checkpoint_t = current_t
current_step = 0
if use_leap:
from leap.rk import RK4MethodBuilder
timestepper = RK4MethodBuilder("state")
else:
timestepper = rk4_step
box_ll = -0.005
box_ur = 0.005
error_state = False
debug = False
from mpi4py import MPI
comm = MPI.COMM_WORLD
rank = comm.Get_rank()
nproc = comm.Get_size()
restart_file_pattern = "{casename}-{step:04d}-{rank:04d}.pkl"
restart_path = "restart_data/"
if restart_step:
if not restart_name:
restart_name = casename
rst_filename = (restart_path + restart_file_pattern.format(
casename=restart_name, step=restart_step, rank=rank))
from mirgecom.restart import read_restart_data
restart_data = read_restart_data(actx, rst_filename)
local_mesh = restart_data["local_mesh"]
local_nelements = local_mesh.nelements
global_nelements = restart_data["global_nelements"]
assert restart_data["nparts"] == nproc
else:
from meshmode.mesh.generation import generate_regular_rect_mesh
generate_mesh = partial(generate_regular_rect_mesh,
a=(box_ll, ) * dim,
b=(box_ur, ) * dim,
nelements_per_axis=(nel_1d, ) * dim)
local_mesh, global_nelements = generate_and_distribute_mesh(
comm, generate_mesh)
local_nelements = local_mesh.nelements
discr = EagerDGDiscretization(actx,
local_mesh,
order=order,
mpi_communicator=comm)
nodes = thaw(actx, discr.nodes())
# {{{ Set up initial state using Cantera
# Use Cantera for initialization
# -- Pick up a CTI for the thermochemistry config
# --- Note: Users may add their own CTI file by dropping it into
# --- mirgecom/mechanisms alongside the other CTI files.
from mirgecom.mechanisms import get_mechanism_cti
mech_cti = get_mechanism_cti("uiuc")
cantera_soln = cantera.Solution(phase_id="gas", source=mech_cti)
nspecies = cantera_soln.n_species
# Initial temperature, pressure, and mixutre mole fractions are needed to
# set up the initial state in Cantera.
init_temperature = 1500.0 # Initial temperature hot enough to burn
# Parameters for calculating the amounts of fuel, oxidizer, and inert species
equiv_ratio = 1.0
ox_di_ratio = 0.21
stoich_ratio = 3.0
# Grab the array indices for the specific species, ethylene, oxygen, and nitrogen
i_fu = cantera_soln.species_index("C2H4")
i_ox = cantera_soln.species_index("O2")
i_di = cantera_soln.species_index("N2")
x = np.zeros(nspecies)
# Set the species mole fractions according to our desired fuel/air mixture
x[i_fu] = (ox_di_ratio * equiv_ratio) / (stoich_ratio +
ox_di_ratio * equiv_ratio)
x[i_ox] = stoich_ratio * x[i_fu] / equiv_ratio
x[i_di] = (1.0 - ox_di_ratio) * x[i_ox] / ox_di_ratio
# Uncomment next line to make pylint fail when it can't find cantera.one_atm
one_atm = cantera.one_atm # pylint: disable=no-member
# one_atm = 101325.0
# Let the user know about how Cantera is being initilized
print(f"Input state (T,P,X) = ({init_temperature}, {one_atm}, {x}")
# Set Cantera internal gas temperature, pressure, and mole fractios
cantera_soln.TPX = init_temperature, one_atm, x
# Pull temperature, total density, mass fractions, and pressure from Cantera
# We need total density, and mass fractions to initialize the fluid/gas state.
can_t, can_rho, can_y = cantera_soln.TDY
can_p = cantera_soln.P
# *can_t*, *can_p* should not differ (significantly) from user's initial data,
# but we want to ensure that we use exactly the same starting point as Cantera,
# so we use Cantera's version of these data.
# }}}
# {{{ Create Pyrometheus thermochemistry object & EOS
# Create a Pyrometheus EOS with the Cantera soln. Pyrometheus uses Cantera and
# generates a set of methods to calculate chemothermomechanical properties and
# states for this particular mechanism.
pyrometheus_mechanism = pyro.get_thermochem_class(cantera_soln)(actx.np)
eos = PyrometheusMixture(pyrometheus_mechanism,
temperature_guess=init_temperature)
# }}}
# {{{ MIRGE-Com state initialization
# Initialize the fluid/gas state with Cantera-consistent data:
# (density, pressure, temperature, mass_fractions)
print(f"Cantera state (rho,T,P,Y) = ({can_rho}, {can_t}, {can_p}, {can_y}")
initializer = MixtureInitializer(dim=dim,
nspecies=nspecies,
pressure=can_p,
temperature=can_t,
massfractions=can_y,
velocity=velocity)
my_boundary = AdiabaticSlipBoundary()
boundaries = {BTAG_ALL: my_boundary}
if restart_step:
current_t = restart_data["t"]
current_step = restart_step
current_state = restart_data["state"]
else:
# Set the current state from time 0
current_state = initializer(eos=eos, x_vec=nodes, t=0)
# Inspection at physics debugging time
if debug:
print("Initial MIRGE-Com state:")
print(f"{current_state=}")
print(f"Initial DV pressure: {eos.pressure(current_state)}")
print(f"Initial DV temperature: {eos.temperature(current_state)}")
# }}}
visualizer = make_visualizer(discr)
initname = initializer.__class__.__name__
eosname = eos.__class__.__name__
init_message = make_init_message(dim=dim,
order=order,
nelements=local_nelements,
global_nelements=global_nelements,
dt=current_dt,
t_final=t_final,
nstatus=nstatus,
nviz=nviz,
cfl=current_cfl,
constant_cfl=constant_cfl,
initname=initname,
eosname=eosname,
casename=casename)
# Cantera equilibrate calculates the expected end state @ chemical equilibrium
# i.e. the expected state after all reactions
cantera_soln.equilibrate("UV")
eq_temperature, eq_density, eq_mass_fractions = cantera_soln.TDY
eq_pressure = cantera_soln.P
# Report the expected final state to the user
if rank == 0:
logger.info(init_message)
logger.info(f"Expected equilibrium state:"
f" {eq_pressure=}, {eq_temperature=},"
f" {eq_density=}, {eq_mass_fractions=}")
get_timestep = partial(inviscid_sim_timestep,
discr=discr,
t=current_t,
dt=current_dt,
cfl=current_cfl,
eos=eos,
t_final=t_final,
constant_cfl=constant_cfl)
def my_rhs(t, state):
return (euler_operator(
discr, cv=state, t=t, boundaries=boundaries, eos=eos) +
eos.get_species_source_terms(state))
def my_checkpoint(step, t, dt, state):
if check_step(step, nrestart) and step != restart_step:
rst_filename = (restart_path + restart_file_pattern.format(
casename=casename, step=step, rank=rank))
rst_data = {
"local_mesh": local_mesh,
"state": current_state,
"t": t,
"step": step,
"global_nelements": global_nelements,
"num_parts": nproc
}
from mirgecom.restart import write_restart_file
write_restart_file(actx, rst_data, rst_filename, comm)
# awful - computes potentially expensive viz quantities
# regardless of whether it is time to viz
reaction_rates = eos.get_production_rates(state)
viz_fields = [("reaction_rates", reaction_rates)]
return sim_checkpoint(discr,
visualizer,
eos,
cv=state,
vizname=casename,
step=step,
t=t,
dt=dt,
nstatus=nstatus,
nviz=nviz,
constant_cfl=constant_cfl,
comm=comm,
viz_fields=viz_fields)
try:
(current_step, current_t, current_state) = \
advance_state(rhs=my_rhs, timestepper=timestepper,
checkpoint=my_checkpoint,
get_timestep=get_timestep, state=current_state,
t=current_t, t_final=t_final)
except ExactSolutionMismatch as ex:
error_state = True
current_step = ex.step
current_t = ex.t
current_state = ex.state
if not check_step(current_step, nviz): # If final step not an output step
if rank == 0:
logger.info("Checkpointing final state ...")
my_checkpoint(current_step,
t=current_t,
dt=(current_t - checkpoint_t),
state=current_state)
if current_t - t_final < 0:
error_state = True
if error_state:
raise ValueError("Simulation did not complete successfully.")
