def setup_sph_code(self, sph_code, number_of_particles, L, rho, u):
converter = ConvertBetweenGenericAndSiUnits(L, rho, constants.G)
sph_code = sph_code(converter,
mode='periodic') #, redirection = 'none')
sph_code.parameters.periodic_box_size = 10.0 | units.parsec
gas = Particles(number_of_particles)
gas.mass = (rho * L**3) / number_of_particles
numpy.random.seed(12345)
gas.x = L * numpy.random.uniform(0.0, 1.0, number_of_particles)
gas.y = L * numpy.random.uniform(0.0, 1.0, number_of_particles)
gas.z = L * numpy.random.uniform(0.0, 1.0, number_of_particles)
gas.vx = numpy.zeros(number_of_particles) | units.cm / units.s
gas.vy = numpy.zeros(number_of_particles) | units.cm / units.s
gas.vz = numpy.zeros(number_of_particles) | units.cm / units.s
gas.u = u
if isinstance(sph_code, Fi):
sph_code.parameters.self_gravity_flag = False
sph_code.parameters.timestep = 0.1 | generic_unit_system.time
gas.h_smooth = L / number_of_particles**(1 / 3.0)
gas.position -= 0.5 * L
sph_code.gas_particles.add_particles(gas)
sph_code.commit_particles()
#~ sph_code.evolve_model(0.01 | units.Myr)
return sph_code
def setup_sph_code(sph_code, N, L, rho, u):
converter = ConvertBetweenGenericAndSiUnits(L, rho, constants.G)
sph_code = sph_code(converter, mode='periodic') #, redirection = 'none')
sph_code.parameters.periodic_box_size = 10.0 | units.parsec
plummer = new_plummer_gas_model(N, convert_nbody=converter)
plummer = plummer.select(lambda r: r.length() < 0.5 * L, ["position"])
N = len(plummer)
print "N=", len(plummer)
plummer.mass = (rho * L**3) / N
gas = Particles(N)
gas.mass = 0.01 * (rho * L**3) / N
numpy.random.seed(12345)
gas.x = L * numpy.random.uniform(0.0, 1.0, N)
gas.y = L * numpy.random.uniform(0.0, 1.0, N)
gas.z = L * numpy.random.uniform(0.0, 1.0, N)
gas.vx = numpy.zeros(N) | units.cm / units.s
gas.vy = numpy.zeros(N) | units.cm / units.s
gas.vz = numpy.zeros(N) | units.cm / units.s
gas.u = u
if isinstance(sph_code, Fi):
sph_code.parameters.self_gravity_flag = False
sph_code.parameters.timestep = 0.1 | generic_unit_system.time
gas.h_smooth = L / N**(1 / 3.0)
gas.position -= 0.5 * L
sph_code.gas_particles.add_particles(gas)
sph_code.gas_particles.add_particles(plummer)
sph_code.commit_particles()
return sph_code
def run_supernova():
use_hydro_code = Gadget2
hydro_code_options = dict(number_of_workers=3)
number_of_sph_particles = 3000
t_end = 1.0e4 | units.s
pickle_file = setup_stellar_evolution_model()
model = convert_stellar_model_to_SPH(None,
number_of_sph_particles,
seed=12345,
pickle_file=pickle_file,
with_core_particle=True,
target_core_mass=1.4 | units.MSun)
print("model=", model.core_particle)
core, gas_without_core, core_radius \
= model.core_particle, model.gas_particles, model.core_radius
inject_supernova_energy(gas_without_core)
print("\nEvolving (SPH) to:", t_end)
n_steps = 100
unit_converter = ConvertBetweenGenericAndSiUnits(1.0 | units.RSun,
constants.G, t_end)
hydro_code = use_hydro_code(unit_converter, **hydro_code_options)
try:
hydro_code.parameters.timestep = t_end / n_steps
except Exception as exc:
if not "parameter is read-only" in str(exc): raise
hydro_code.parameters.epsilon_squared = core_radius**2
hydro_code.parameters.n_smooth_tol = 0.01
hydro_code.gas_particles.add_particles(gas_without_core)
hydro_code.dm_particles.add_particle(core)
times = [] | units.s
potential_energies = [] | units.J
kinetic_energies = [] | units.J
thermal_energies = [] | units.J
for time, i_step in [(i * t_end / n_steps, i)
for i in range(0, n_steps + 1)]:
hydro_code.evolve_model(time)
times.append(time)
potential_energies.append(hydro_code.potential_energy)
kinetic_energies.append(hydro_code.kinetic_energy)
thermal_energies.append(hydro_code.thermal_energy)
hydro_plot([-1.0, 1.0, -1.0, 1.0] * (350 | units.RSun), hydro_code,
(100, 100), time,
os.path.join(
get_path_to_results(),
"supernova_hydro_image{0:=03}.png".format(i_step)))
energy_plot(times, kinetic_energies, potential_energies, thermal_energies,
"supernova_energy_evolution.pdf")
hydro_code.stop()
def relax_in_isolation(giant_in_sph, sph_code, output_base_name):
total_mass = giant_in_sph.gas_particles.total_mass() + giant_in_sph.core_particle.mass
total_radius = max(giant_in_sph.gas_particles.position.lengths_squared()).sqrt()
dynamical_timescale = (total_radius**3 / (2 * constants.G * total_mass)).sqrt().as_quantity_in(units.day)
t_end = (10.0 * dynamical_timescale).as_quantity_in(units.day)
n_steps = 100
hydro_code_options = dict(number_of_workers=2, redirection='file', redirect_file='hydrodynamics_code_relax_out.log')
unit_converter = ConvertBetweenGenericAndSiUnits(total_radius, total_mass, t_end)
hydrodynamics = sph_code(unit_converter, **hydro_code_options)
hydrodynamics.parameters.epsilon_squared = giant_in_sph.core_radius**2
hydrodynamics.parameters.max_size_timestep = t_end
hydrodynamics.parameters.time_max = 1.1 * t_end
hydrodynamics.parameters.time_limit_cpu = 7.0 | units.day
hydrodynamics.gas_particles.add_particles(giant_in_sph.gas_particles)
hydrodynamics.dm_particles.add_particle(giant_in_sph.core_particle)
potential_energies = hydrodynamics.potential_energy.as_vector_with_length(1).as_quantity_in(units.erg)
kinetic_energies = hydrodynamics.kinetic_energy.as_vector_with_length(1).as_quantity_in(units.erg)
thermal_energies = hydrodynamics.thermal_energy.as_vector_with_length(1).as_quantity_in(units.erg)
print(" Relaxing for", t_end, "(10 * dynamical timescale)")
times = (t_end * list(range(1, n_steps+1)) / n_steps).as_quantity_in(units.day)
for i_step, time in enumerate(times):
hydrodynamics.evolve_model(time)
print(" Relaxed for:", time)
potential_energies.append(hydrodynamics.potential_energy)
kinetic_energies.append(hydrodynamics.kinetic_energy)
thermal_energies.append(hydrodynamics.thermal_energy)
hydrodynamics.gas_particles.copy_values_of_attributes_to(
['mass', 'x','y','z', 'vx','vy','vz', 'u', 'h_smooth'],
giant_in_sph.gas_particles)
giant_in_sph.core_particle.position = hydrodynamics.dm_particles[0].position
giant_in_sph.core_particle.velocity = hydrodynamics.dm_particles[0].velocity
hydrodynamics.stop()
snapshotfile = output_base_name + "_gas.amuse"
write_set_to_file(giant_in_sph.gas_particles, snapshotfile, format='amuse')
shutil.copy(snapshotfile, os.path.join("..", "giant_models"))
snapshotfile = output_base_name + "_core.amuse"
# temporarily store core_radius on the core particle
giant_in_sph.core_particle.radius = giant_in_sph.core_radius
write_set_to_file(giant_in_sph.core_particle.as_set(), snapshotfile, format='amuse')
giant_in_sph.core_particle.radius = 0.0 | units.m
shutil.copy(snapshotfile, os.path.join("..", "giant_models"))
energy_evolution_plot(times, kinetic_energies, potential_energies, thermal_energies,
figname = output_base_name + "_energy_evolution.png")
def test2(self):
print("Demonstrate new_sink_particles usage")
cloud = Particles(100)
cloud.mass = 1 | units.MSun
cloud.position = [[0, 0, 0], [100, 100, 100], [200, 200, 200],
[300, 300, 300]] * 25 | units.parsec
cloud.velocity = [[0, 0, 0], [1, 1, 1]] * 50 | units.km / units.s
unit_converter = ConvertBetweenGenericAndSiUnits(
1 | units.m, 1 | units.kg, 1 | units.s)
sph_code = Stub(unit_converter)
sph_code.parameters.stopping_condition_maximum_density = 1 | units.kg / units.m**3
sph_code.gas_particles.add_particles(cloud)
density_limit_detection = sph_code.stopping_conditions.density_limit_detection
density_limit_detection.enable()
sph_code.evolve_model(1 | units.Myr)
self.assertTrue(density_limit_detection.is_set())
self.assertEqual(len(density_limit_detection.particles()), 3)
self.assertEqual(density_limit_detection.particles().position,
[[100, 100, 100], [200, 200, 200], [300, 300, 300]]
| units.parsec)
print(density_limit_detection.particles())
clumps = density_limit_detection.particles().copy()
sph_code.gas_particles.remove_particles(clumps)
sinks = new_sink_particles(clumps,
sink_radius=1 | units.parsec,
looping_over=self.looping_over)
self.assertEqual(sinks.sink_radius, 1.0 | units.parsec)
self.assertEqual(sinks.mass, 1.0 | units.MSun)
self.assertEqual(sinks.position,
[[100, 100, 100], [200, 200, 200], [300, 300, 300]]
| units.parsec)
self.assertEqual(len(sph_code.gas_particles), 97)
self.assertAlmostRelativeEqual(
sph_code.gas_particles.total_mass() + clumps.total_mass(),
100 | units.MSun, 10)
self.assertAlmostRelativeEqual(sph_code.gas_particles.total_mass(),
97 | units.MSun, 10)
sinks.accrete(sph_code.gas_particles)
self.assertAlmostRelativeEqual(sinks.mass, [25, 25, 25] | units.MSun,
10)
self.assertEqual(len(sph_code.gas_particles), 25)
self.assertAlmostRelativeEqual(
sph_code.gas_particles.total_mass() + clumps.total_mass(),
100 | units.MSun, 10)
self.assertAlmostRelativeEqual(sph_code.gas_particles.total_mass(),
25 | units.MSun, 10)
def slowtest1(self):
stellar_evolution = self.new_instance(MESA)
stellar_evolution.particles.add_particles(
Particles(2, mass=[1.0, 5.0] | units.MSun))
stellar_evolution.evolve_model(10.0 | units.Myr)
initial_separation = stellar_evolution.particles.radius.sum()
sph_particles_1 = convert_stellar_model_to_SPH(
stellar_evolution.particles[0], 200, seed=12345).gas_particles
sph_particles_2 = convert_stellar_model_to_SPH(
stellar_evolution.particles[1], 1000, seed=12345).gas_particles
stellar_evolution.stop()
initial_speed = 10.0 | units.km / units.s
sph_particles_2.x += initial_separation
sph_particles_1.vx += initial_speed
all_sph_particles = ParticlesSuperset(
[sph_particles_1, sph_particles_2])
all_sph_particles.move_to_center()
t_end = 4.0e3 | units.s
print "Evolving to:", t_end
n_steps = 4
unit_system_converter = ConvertBetweenGenericAndSiUnits(
1.0 | units.RSun, 1.0 | units.MSun, t_end)
hydro_code = Gadget2(unit_system_converter)
hydro_code.gas_particles.add_particles(all_sph_particles)
pyplot.ion()
for time in [i * t_end / n_steps for i in range(1, n_steps + 1)]:
hydro_code.evolve_model(time)
pyplot.close('all')
pyplot.figure()
pynbody_column_density_plot(hydro_code.gas_particles,
width=10 | units.RSun)
pyplot.draw()
pyplot.figure()
loglog(hydro_code.gas_particles.position.lengths_squared(),
hydro_code.gas_particles.pressure, 'bo')
pyplot.draw()
hydro_code.stop()
sleep(3)
pyplot.ioff()
def prepare_giant_system(sph_code, giant_model, view_on_giant, time_unit, n_steps):
hydro_code_options = dict(number_of_workers=2,
redirection='file', redirect_file='hydrodynamics_code_out.log')
unit_converter = ConvertBetweenGenericAndSiUnits(
1.0 | units.RSun,
giant_model.gas_particles.total_mass() + giant_model.core_particle.mass,
time_unit)
system = sph_code(unit_converter, **hydro_code_options)
system.parameters.epsilon_squared = giant_model.core_radius**2
system.parameters.max_size_timestep = time_unit / n_steps
system.parameters.time_max = 1.1 * time_unit
system.parameters.time_limit_cpu = 7.0 | units.day
giant_model.gas_particles.position += view_on_giant.position
giant_model.gas_particles.velocity += view_on_giant.velocity
giant_model.core_particle.position += view_on_giant.position
giant_model.core_particle.velocity += view_on_giant.velocity
system.gas_particles.add_particles(giant_model.gas_particles)
system.dm_particles.add_particle(giant_model.core_particle)
return system
def new_particles(self):
input_file = os.path.join(get_path_to_results(),
"test_sph_to_star_input.hdf5")
if os.path.exists(input_file):
return read_set_from_file(input_file, "hdf5")
stellar_evolution = EVtwin()
stellar_evolution.particles.add_particle(
Particle(mass=1.0 | units.MSun))
stellar_evolution.evolve_model(100.0 | units.Myr)
particles = convert_stellar_model_to_SPH(
stellar_evolution.particles[0], 500, seed=12345).gas_particles
stellar_evolution.stop()
hydrodynamics = Gadget2(
ConvertBetweenGenericAndSiUnits(1.0 | units.MSun, 1.0 | units.RSun,
1.0e3 | units.s))
hydrodynamics.gas_particles.add_particles(particles)
hydrodynamics.evolve_model(1.0 | units.s)
hydrodynamics.gas_particles.copy_values_of_attributes_to(
["density", "u", "pressure"], particles)
hydrodynamics.stop()
write_set_to_file(particles, input_file, "hdf5")
return particles
class CalculateSolutionIn3D(object):
number_of_workers = 1
number_of_grid_points = 10
gamma = 5.0 / 3.0
name_of_the_code = "gadget2"
hydro_code_options = dict(redirection="none")
convert_generic_units = ConvertBetweenGenericAndSiUnits(
1.0 | units.kpc, 1.0e10 | units.MSun, constants.G)
convert_nbody_units = nbody_to_si(1.0 | units.kpc, 1.0e10 | units.MSun)
def __init__(self, **keyword_arguments):
for x in keyword_arguments:
# print x, keyword_arguments[x]
setattr(self, x, keyword_arguments[x])
self.dimensions_of_mesh = (self.number_of_grid_points * 3,
self.number_of_grid_points,
self.number_of_grid_points)
def new_instance_of_code(self):
attribute = "new_instance_of_{0}_code".format(
self.name_of_the_code.lower())
return getattr(self, attribute)()
def new_instance_of_athena_code(self):
result = Athena(number_of_workers=self.number_of_workers,
**self.hydro_code_options)
result.initialize_code()
result.parameters.gamma = self.gamma
result.parameters.courant_number = 0.3
return result
def new_instance_of_mpiamrvac_code(self):
result = MpiAmrVac(number_of_workers=self.number_of_workers,
**self.hydro_code_options)
result.set_parameters_filename(result.default_parameters_filename)
result.initialize_code()
return result
def new_instance_of_capreole_code(self):
result = Capreole(number_of_workers=self.number_of_workers,
**self.hydro_code_options)
result.initialize_code()
return result
grid_hydro_codes = ("athena", "mpiamrvac", "capreole")
def new_instance_of_gadget2_code(self):
result = Gadget2(self.convert_generic_units,
number_of_workers=self.number_of_workers,
mode="periodic",
**self.hydro_code_options)
result.initialize_code()
return result
def new_instance_of_fi_code(self):
result = Fi(self.convert_nbody_units,
number_of_workers=self.number_of_workers,
mode="periodic",
**self.hydro_code_options)
result.initialize_code()
result.parameters.self_gravity_flag = False
result.parameters.timestep = 0.01 | time
return result
sph_hydro_codes = ("gadget2", "fi")
def set_parameters(self, instance):
if self.name_of_the_code in self.sph_hydro_codes:
instance.parameters.periodic_box_size = 1.0 | length
else:
instance.parameters.mesh_size = self.dimensions_of_mesh
instance.parameters.length_x = 1 | length
instance.parameters.length_y = 1 | length
instance.parameters.length_z = 1 | length
instance.parameters.x_boundary_conditions = ("periodic",
"periodic")
instance.parameters.y_boundary_conditions = ("periodic",
"periodic")
instance.parameters.z_boundary_conditions = ("periodic",
"periodic")
result = instance.commit_parameters()
def new_grid(self):
grid = Grid.create(self.dimensions_of_mesh, [1, 1, 1] | length)
self.clear_grid(grid)
return grid
def clear_grid(self, grid):
density = mass / length**3
momentum = speed * density
energy = mass / (time**2 * length)
grid.rho = 0.0 | density
grid.rhovx = 0.0 | momentum
grid.rhovy = 0.0 | momentum
grid.rhovz = 0.0 | momentum
grid.energy = 0.0 | energy
return grid
def initialize_grid_with_shock(self, grid):
energy = mass / (time**2 * length)
halfway = self.dimensions_of_mesh[0] / 2 - 1
firsthalf = grid.x <= 0.5 | length
secondhalf = grid.x > 0.5 | length
grid[firsthalf].rho = 4.0 | density
grid[firsthalf].energy = (1.0 | energy) / (self.gamma - 1)
grid[secondhalf].rho = 1.0 | density
grid[secondhalf].energy = (0.1795 | energy) / (self.gamma - 1)
def set_initial_conditions(self, instance):
if self.name_of_the_code in self.sph_hydro_codes:
initial_grid = self.new_grid()
self.initialize_grid_with_shock(initial_grid)
if self.name_of_the_code == "fi":
initial_grid.position -= 0.5 | length
sph_particles = convert_grid_to_SPH(initial_grid,
self.number_of_particles)
instance.gas_particles.add_particles(sph_particles)
else:
for x in instance.itergrids():
inmem = x.copy()
self.clear_grid(inmem)
self.initialize_grid_with_shock(inmem)
from_model_to_code = inmem.new_channel_to(x)
from_model_to_code.copy()
instance.initialize_grid()
def copy_results(self, instance):
if self.name_of_the_code in self.sph_hydro_codes:
n_samples = self.number_of_grid_points * 3
result = Particles(n_samples)
result.position = [(x, 0.5, 0.5) | length
for x in numpy.linspace(0.0, 1.0, n_samples)]
x, y, z = result.x, result.y, result.z
if self.name_of_the_code == "fi":
x -= (0.5 | length)
y -= (0.5 | length)
z -= (0.5 | length)
no_speed = [0.0] * n_samples | speed
result.rho, result.rhovx, result.rhovy, result.rhovz, result.energy = [
self.convert_generic_units.to_generic(quantity)
for quantity in instance.get_hydro_state_at_point(
x, y, z, no_speed, no_speed, no_speed)
]
else:
result = []
for x in instance.itergrids():
result.append(x.copy())
return result
def get_solution_at_time(self, time):
instance = self.new_instance_of_code()
self.set_parameters(instance)
self.set_initial_conditions(instance)
print "start evolve"
instance.evolve_model(time)
print "copying results"
result = self.copy_results(instance)
print "terminating code"
instance.stop()
return result
def test3(self):
print("Demonstrate new_sink_particles usage (using Gadget2)")
UnitLength = 1.0 | units.kpc
UnitMass = 1.0e10 | units.MSun
UnitVelocity = 1.0 | units.km / units.s
convert_nbody = nbody_system.nbody_to_si(UnitLength, UnitMass)
converter = ConvertBetweenGenericAndSiUnits(UnitLength, UnitMass, UnitVelocity)
number_gas_particles = 1000
gas = new_evrard_gas_sphere(number_gas_particles, convert_nbody, do_scale=True, seed=12345)
sph_code = Gadget2(converter)
sph_code.initialize_code()
sph_code.parameters.stopping_condition_maximum_density = 10 * UnitMass / UnitLength**3
sph_code.gas_particles.add_particles(gas)
self.assertIsOfOrder(max(sph_code.gas_particles.density), UnitMass / UnitLength**3)
density_limit_detection = sph_code.stopping_conditions.density_limit_detection
density_limit_detection.enable()
sph_code.evolve_model(10.0 | units.Myr)
self.assertTrue(density_limit_detection.is_set())
self.assertTrue(sph_code.model_time < 10.0 | units.Myr)
print("density_limit exceeded at t =", sph_code.model_time.as_quantity_in(units.Myr))
self.assertEqual(len(density_limit_detection.particles()), 1)
self.assertTrue(density_limit_detection.particles().density >
10 * UnitMass / UnitLength**3)
clumps = density_limit_detection.particles().copy()
sph_code.gas_particles.remove_particles(clumps)
clumps_in_code = sph_code.dm_particles.add_particles(clumps)
sinks = new_sink_particles(clumps_in_code,looping_over=self.looping_over)
self.assertEqual(sinks.sink_radius, clumps.radius)
self.assertAlmostRelativeEqual(sinks.mass, UnitMass / number_gas_particles, 10)
self.assertAlmostRelativeEqual(sinks.position, clumps.position, 10)
self.assertEqual(len(sph_code.gas_particles), number_gas_particles - 1)
self.assertAlmostRelativeEqual(sph_code.particles.total_mass(), UnitMass, 10)
self.assertAlmostRelativeEqual(sph_code.gas_particles.total_mass(), UnitMass - sinks.total_mass(), 10)
self.assertEqual(set(sinks.get_attribute_names_defined_in_store()) - set(["sink_radius","lx","ly","lz"]),
set(sph_code.particles.get_attribute_names_defined_in_store()))
sinks.accrete(sph_code.gas_particles)
self.assertAlmostRelativeEqual(sinks.mass, 3 * UnitMass / number_gas_particles, 10)
self.assertEqual(len(sph_code.gas_particles), number_gas_particles - 3)
self.assertAlmostRelativeEqual(sph_code.particles.total_mass(), UnitMass, 10)
self.assertAlmostRelativeEqual(sph_code.gas_particles.total_mass(), UnitMass - sinks.total_mass(), 10)
sinks.accrete(sph_code.particles) # Nothing happens: gas already gone, and cannot accrete itself
self.assertAlmostRelativeEqual(sinks.mass, 3 * UnitMass / number_gas_particles, 10)
self.assertAlmostRelativeEqual(sph_code.particles.total_mass(), UnitMass, 10)
steps = 0
while True:
sph_code.evolve_model(sph_code.model_time + (0.1 | units.Myr))
sinks.sink_radius = 4 * clumps_in_code.radius
sinks.accrete(sph_code.gas_particles)
steps += 1
if density_limit_detection.is_set():
break
self.assertEqual(len(sph_code.gas_particles), number_gas_particles - 7)
self.assertAlmostRelativeEqual(sinks.mass, 7 * UnitMass / number_gas_particles, 10)
self.assertAlmostRelativeEqual(sph_code.particles.total_mass(), UnitMass, 10)
self.assertAlmostRelativeEqual(sph_code.gas_particles.total_mass(), UnitMass - sinks.total_mass(), 10)
self.assertTrue(density_limit_detection.is_set())
self.assertEqual(steps, 5)
self.assertTrue(sph_code.model_time < 10.0 | units.Myr)
print("density_limit exceeded at t =", sph_code.model_time.as_quantity_in(units.Myr))
self.assertEqual(len(density_limit_detection.particles()), 5)
self.assertTrue((density_limit_detection.particles().density >
10 * UnitMass / UnitLength**3).all())
clumps = density_limit_detection.particles().copy()
sph_code.gas_particles.remove_particles(clumps)
clumps_in_code = sph_code.dm_particles.add_particles(clumps)
sinks.add_sinks(clumps_in_code, sink_radius=0.1|units.kpc)
self.assertEqual(sinks[1:].sink_radius, 0.1 | units.kpc)
self.assertEqual(len(sph_code.gas_particles), number_gas_particles - 12)
self.assertAlmostRelativeEqual(sinks.mass[1:], UnitMass / number_gas_particles, 10)
self.assertAlmostRelativeEqual(sinks.position[1:], clumps.position, 10)
self.assertAlmostRelativeEqual(sph_code.particles.total_mass(), UnitMass, 10)
self.assertAlmostRelativeEqual(sph_code.gas_particles.total_mass(), UnitMass - sinks.total_mass(), 10)
sinks.accrete(sph_code.gas_particles)
self.assertEqual(len(sph_code.gas_particles), number_gas_particles - 66)
self.assertAlmostRelativeEqual(sph_code.particles.total_mass().as_quantity_in(units.MSun), UnitMass, 10)
self.assertAlmostRelativeEqual(sinks.mass, [7.0, 13.0, 15.0, 9.0, 11.0, 11.0] * UnitMass / number_gas_particles, 10)
class CalculateSolutionIn3D(object):
size = 10.0 | length
number_of_workers = 1
number_of_grid_points = 25
gamma = 5.0 / 3.0
rho_medium = 0 | density
rho_sphere = 0.5 | density
center = [1.0 / 2.0, 1.0 / 2.0, 1.0 / 2.0] * size
radius = 1.0 | length
total_mass = 1.0 | mass
name_of_the_code = "athena_selfgravity"
convert_generic_units = ConvertBetweenGenericAndSiUnits(
1.0 | units.kpc, 1.0e10 | units.MSun, constants.G)
def __init__(self, **keyword_arguments):
for x in keyword_arguments:
print(x, keyword_arguments[x])
setattr(self, x, keyword_arguments[x])
self.dimensions_of_mesh = (self.number_of_grid_points,
self.number_of_grid_points,
self.number_of_grid_points)
self.instance = None
def new_instance_of_code(self):
attribute = "new_instance_of_{0}_code".format(
self.name_of_the_code.lower())
return getattr(self, attribute)()
def new_instance_of_athena_selfgravity_code(self):
result = Athena(mode=AthenaInterface.MODE_SELF_GRAVITY,
redirection="none",
number_of_workers=1)
result.initialize_code()
result.parameters.gamma = self.gamma
result.parameters.courant_number = 0.3
result.set_grav_mean_rho(self.rho_mean)
return result
def new_instance_of_athena_code(self):
result = Athena(redirection="none", number_of_workers=1)
result.initialize_code()
result.parameters.gamma = self.gamma
result.parameters.courant_number = 0.3
return result
def new_instance_of_athena_and_nbody_code(self):
gridcode = Athena(redirection="none", number_of_workers=1)
gridcode.initialize_code()
gridcode.parameters.gamma = self.gamma
gridcode.parameters.courant_number = 0.3
gridcode.set_has_external_gravitational_potential(1)
nbodycode = PhiGRAPE(mode="gpu")
# nbodycode = Octgrav(mode="gpu")
nbodycode.initialize_code()
nbodycode.parameters.epsilon_squared = (
self.size / (10000.0 * self.number_of_grid_points))**2
nbodycode.commit_parameters()
result = HydroGridAndNbody(gridcode, nbodycode)
return result
def new_instance_of_capreole_and_nbody_code(self):
gridcode = Capreole(number_of_workers=self.number_of_workers)
gridcode.initialize_code()
nbodycode = PhiGRAPE(mode="gpu")
# nbodycode = Octgrav(mode="gpu")
nbodycode.initialize_code()
nbodycode.parameters.epsilon_squared = (
self.size / (10000.0 * self.number_of_grid_points))**2
nbodycode.commit_parameters()
result = HydroGridAndNbodyWithAccelerationTransfer(gridcode, nbodycode)
return result
def set_parameters(self, instance):
instance.parameters.mesh_size = self.dimensions_of_mesh
instance.parameters.length_x = self.size
instance.parameters.length_y = self.size
instance.parameters.length_z = self.size
instance.parameters.x_boundary_conditions = ("periodic", "periodic")
instance.parameters.y_boundary_conditions = ("periodic", "periodic")
instance.parameters.z_boundary_conditions = ("periodic", "periodic")
result = instance.commit_parameters()
def new_grid(self):
density = mass / length**3
density = density
momentum = speed * density
energy = mass / (time**2 * length)
grid = Grid.create(self.dimensions_of_mesh,
(10.0, 10.0, 10.0) | length)
grid.rho = self.rho_medium
grid.rhovx = 0.0 | momentum
grid.rhovy = 0.0 | momentum
grid.rhovz = 0.0 | momentum
grid.energy = 0.0 | energy
return grid
def initialize_grid_with_plummer_sphere(self, grid):
scaled_radius = self.radius # / 1.695
radii = (grid.position - self.center).lengths()
selected_radii = radii[radii < self.radius]
print("number of cells in cloud (number of cells in grid)",
len(selected_radii), grid.shape, grid.size)
self.rho_sphere = ((0.75 * self.total_mass / (pi *
(scaled_radius**3))))
grid.rho = (self.rho_medium + (self.rho_sphere *
((1 + (radii**2) /
(scaled_radius**2))**(-5.0 / 2.0))))
internal_energy = ((0.25 | potential) * (1.0 | length / mass) *
self.total_mass / scaled_radius)
# 1.0 * grid.rho *
grid.energy = grid.rho * \
(internal_energy/((1.0+(radii/scaled_radius)**2)**(1.0/2.0)))
def setup_code(self):
print("setup code")
self.grid = self.new_grid()
self.initialize_grid_with_plummer_sphere(self.grid)
print("Mean density", self.grid.rho.flatten().mean())
self.rho_mean = self.grid.rho.flatten().mean()
self.instance = self.new_instance_of_code()
self.set_parameters(self.instance)
self.from_model_to_code = self.grid.new_channel_to(self.instance.grid)
self.from_code_to_model = self.instance.grid.new_channel_to(self.grid)
self.from_code_to_model.copy_attributes((
"x",
"y",
"z",
))
self.from_model_to_code.copy()
self.instance.initialize_grid()
def get_solution_at_time(self, time):
if self.instance is None:
self.setup_code()
print("start evolve")
self.instance.evolve_model(time)
print("copying results")
self.from_code_to_model.copy()
# print "max,min", max(self.grid.rhovx.flatten()), min(self.grid.rhovx.flatten())
# print "max,min", max(self.grid.rhovy.flatten()), min(self.grid.rhovy.flatten())
# print "max,min", max(self.grid.rhovz.flatten()), min(self.grid.rhovz.flatten())
# print "max,min", max(self.grid.energy.flatten()), min(self.grid.energy.flatten())
# print "max,min", max(self.grid.rho.flatten()), min(self.grid.rho.flatten())
return self.grid
def head_on_stellar_merger(
masses=[0.3, 3.0] | units.MSun,
star_age=310.0 | units.Myr,
maximally_evolved_stars=False,
initial_separation=4.0 | units.RSun,
angle=numpy.pi / 3,
initial_speed=3000.0 | units.km / units.s,
initial_speed_perpendicular=30.0 | units.km / units.s,
number_of_sph_particles=1000,
t_end=1.0e4 | units.s,
sph_code=Fi,
steps_per_snapshot=4,
snapshot_size=100,
use_stored_stellar_models=True
):
"""
masses: Mass of the two stars
star_age: Initial age of the stars (if maximally_evolved_stars is False)
maximally_evolved_stars: Evolve stars as far as the Stellar Evolution code
can get
number_of_sph_particles: Total number of particles of both stars, divided
according to their masses
t_end: (Physical, not computational) duration of the hydrodynamics
simulation
sph_code: Code to use for the hydrodynamics simulation
steps_per_snapshot: A hydroplot snapshot is generated each time after this
many steps (0 or None means no snapshots)
snapshot_size: Size of the snapshot in pixels along one dimension
use_stored_stellar_models: Flag to use previously stored stellar model
files (for speed-up).
"""
# Convert some of the input parameters to string, for use in output file
# names:
n_string = "n" + ("%1.0e" % (number_of_sph_particles)
).replace("+0", "").replace("+", "")
t_end_string = "t" + ("%1.0e" % (t_end.value_in(units.s))
).replace("+0", "").replace("+", "")
masses_string = (
"m1_"
+ (
"%0.3e" % (masses[0].value_in(units.MSun))
).replace("+0", "").replace("+", "")
+ "_m2_"
+ (
"%0.3e" % (masses[1].value_in(units.MSun))
).replace("+0", "").replace("+", "")
)
if maximally_evolved_stars:
star_age_string = "a_max"
else:
star_age_string = "a" + \
("%0.3e" % (star_age.value_in(units.Myr))).replace(
"+0", "").replace("+", "")
base_output_file_name = os.path.join(
get_path_to_results(), "stellar_merger_"+n_string+"_"+t_end_string)
pickle_file_1 = os.path.join(get_path_to_results(
), "stellar_merger_"+masses_string+"_"+star_age_string+"_1.pkl")
pickle_file_2 = os.path.join(get_path_to_results(
), "stellar_merger_"+masses_string+"_"+star_age_string+"_2.pkl")
if not use_stored_stellar_models or not (os.path.exists(pickle_file_1) and os.path.exists(pickle_file_2)):
stars = Particles(2)
stars.mass = masses
try:
stellar_evolution = MESA()
stellar_evolution.initialize_code()
except:
print("MESA was not built. Returning.")
return
stellar_evolution.commit_parameters()
stellar_evolution.particles.add_particles(stars)
stellar_evolution.commit_particles()
if maximally_evolved_stars:
try:
while True:
stellar_evolution.evolve_model()
except AmuseException as exception:
print(exception)
else:
stellar_evolution.evolve_model(star_age)
if os.path.exists(pickle_file_1):
print("Could not save stellar model 1: file already exists.")
else:
pickle_stellar_model(stellar_evolution.particles[0], pickle_file_1)
print("Stellar model 1 saved at:", pickle_file_1)
if os.path.exists(pickle_file_2):
print("Could not save stellar model 2: file already exists.")
else:
pickle_stellar_model(stellar_evolution.particles[1], pickle_file_2)
print("Stellar model 2 saved at:", pickle_file_2)
stellar_evolution.stop()
model_1 = StellarModel2SPH(None, None, pickle_file=pickle_file_1)
model_2 = StellarModel2SPH(None, None, pickle_file=pickle_file_2)
model_1.unpickle_stellar_structure()
model_2.unpickle_stellar_structure()
composition = model_2.composition_profile
midpoints = model_2.midpoints_profile[1:-1]
specific_internal_energy = model_2.specific_internal_energy_profile
number_of_sph_particles_1 = int(
round(
number_of_sph_particles
* (model_1.mass / (model_1.mass + model_2.mass))
)
)
number_of_sph_particles_2 = (
number_of_sph_particles
- number_of_sph_particles_1
)
print("Creating initial conditions from a MESA stellar evolution model:")
print(
model_1.mass,
"star consisting of",
number_of_sph_particles_1,
"particles."
)
sph_particles_1 = convert_stellar_model_to_SPH(
None,
number_of_sph_particles_1,
seed=12345,
pickle_file = pickle_file_1
).gas_particles
print(
model_2.mass,
"star consisting of",
number_of_sph_particles_2,
"particles."
)
sph_particles_2 = convert_stellar_model_to_SPH(
None,
number_of_sph_particles_2,
pickle_file=pickle_file_2
).gas_particles
initial_separation += model_1.radius + model_2.radius
sph_particles_2.x += numpy.cos(angle) * initial_separation
sph_particles_2.y += numpy.sin(angle) * initial_separation
sph_particles_1.vx += (
numpy.cos(angle) * initial_speed
- numpy.sin(angle) * initial_speed_perpendicular
)
sph_particles_1.vy += (
numpy.cos(angle) * initial_speed_perpendicular
+ numpy.sin(angle) * initial_speed
)
view = (
[-0.5, 0.5, -0.5, 0.5]
* (initial_separation + model_1.radius + model_2.radius)
)
all_sph_particles = ParticlesSuperset([sph_particles_1, sph_particles_2])
all_sph_particles.move_to_center()
unit_converter = ConvertBetweenGenericAndSiUnits(
1.0 | units.RSun, constants.G, t_end)
hydro_legacy_code = sph_code(unit_converter)
n_steps = 100
hydro_legacy_code.parameters.n_smooth = 96
try:
hydro_legacy_code.parameters.timestep = t_end / n_steps
except Exception as exc:
if "parameter is read-only" not in str(exc):
raise
hydro_legacy_code.gas_particles.add_particles(all_sph_particles)
times = [] | units.Myr
kinetic_energies = [] | units.J
potential_energies = [] | units.J
thermal_energies = [] | units.J
print("Evolving to:", t_end)
for time, i_step in [(i*t_end/n_steps, i) for i in range(1, n_steps+1)]:
hydro_legacy_code.evolve_model(time)
times.append(time)
kinetic_energies.append(hydro_legacy_code.kinetic_energy)
potential_energies.append(hydro_legacy_code.potential_energy)
thermal_energies.append(hydro_legacy_code.thermal_energy)
if steps_per_snapshot and (not i_step % steps_per_snapshot):
hydro_plot(
view,
hydro_legacy_code,
(snapshot_size, snapshot_size),
base_output_file_name +
"_hydro_image{0:=03}.png".format(i_step)
)
hydro_legacy_code.gas_particles.new_channel_to(
all_sph_particles
).copy_attributes(
['mass', 'x', 'y', 'z', 'vx', 'vy', 'vz', 'u']
)
center_of_mass = all_sph_particles.center_of_mass(
).as_quantity_in(units.RSun)
center_of_mass_velocity = all_sph_particles.center_of_mass_velocity(
).as_quantity_in(units.km / units.s)
print()
print("center_of_mass:", center_of_mass)
print("center_of_mass_velocity:", center_of_mass_velocity)
all_sph_particles.position -= center_of_mass
sph_midpoints = all_sph_particles.position.lengths()
energy_plot(
times,
kinetic_energies, potential_energies, thermal_energies,
base_output_file_name+"_energy_evolution.png"
)
thermal_energy_plot(
times,
thermal_energies,
base_output_file_name+"_thermal_energy_evolution.png"
)
composition_comparison_plot(
midpoints, composition[0],
sph_midpoints, all_sph_particles.h1,
base_output_file_name+"_composition_h1.png"
)
internal_energy_comparison_plot(
midpoints, specific_internal_energy,
sph_midpoints, all_sph_particles.u,
base_output_file_name+"_new_u.png"
)
hydro_plot(
[-2.0, 2.0, -2.0, 2.0] | units.RSun,
hydro_legacy_code,
(100, 100),
base_output_file_name + "_hydro_image.png"
)
hydro_legacy_code.stop()
print("All done!\n")
from amuse.community.fi.interface import Fi
from amuse.rfi.core import is_mpd_running
usage = """\
usage: amuse.sh %prog [options]
This example script will simulate the spherical collapse of
an initially-cold adiabatic gas cloud, with a radial density
profile proportional to 1/r.
"""
labels = [['K', 'V', 'U', 'E'], ['K', 'V', 'U', 'E']]
fi_gadget_labels = [['K_fi', 'V_fi', 'U_fi', 'E_fi'],
['K_gadget', 'V_gadget', 'U_gadget', 'E_gadget']]
convert_generic_units = ConvertBetweenGenericAndSiUnits(
1.0 | units.kpc, 1.0e10 | units.MSun, constants.G)
convert_nbody_units = nbody_system.nbody_to_si(1.0 | units.kpc,
1.0e10 | units.MSun)
def run_evrard(hydro_legacy_codes,
number_of_particles,
random_seed=None,
name_of_the_figure="evrard_collapse_test.png"):
print "\nThe spherical collapse of an initially-cold adiabatic gas cloud,\n", \
"consisting of ", str(number_of_particles), "particles will be simulated...\n"
t_end = 3.0 * convert_nbody_units.to_si(
1.0 | nbody_system.time) # (3 natural timescales)
print "Evolving to (3 natural timescales): ", t_end.as_quantity_in(
def run_supernova():
# options:
use_hydro_code = Gadget2 # Fi -or- Gadget2
hydro_code_options = dict(
number_of_workers=3
) # e.g. dict(use_gl = True) or dict(redirection = "none")
number_of_sph_particles = 30000
t_end = 1.0e5 | units.s
pickle_file = setup_stellar_evolution_model()
print "Creating initial conditions from a MESA stellar evolution model..."
model = convert_stellar_model_to_SPH(
None,
number_of_sph_particles,
seed=12345,
pickle_file=pickle_file,
# base_grid_options = dict(type = "glass", target_rms = 0.01),
with_core_particle=True)
core, gas_without_core, core_radius = model.core_particle, model.gas_particles, model.core_radius
if len(core):
print "Created", len(
gas_without_core), "SPH particles and one 'core-particle':\n", core
print "Setting gravitational smoothing to:", core_radius
else:
print "Warning: Only SPH particles created."
inject_supernova_energy(gas_without_core)
print "\nEvolving (SPH) to:", t_end
n_steps = 100
unit_converter = ConvertBetweenGenericAndSiUnits(1.0 | units.RSun,
constants.G, t_end)
hydro_code = use_hydro_code(unit_converter, **hydro_code_options)
try:
hydro_code.parameters.timestep = t_end / n_steps
except Exception as exc:
if not "parameter is read-only" in str(exc): raise
hydro_code.parameters.epsilon_squared = core_radius**2
hydro_code.parameters.n_smooth_tol = 0.01
hydro_code.gas_particles.add_particles(gas_without_core)
hydro_code.dm_particles.add_particles(core)
times = [] | units.s
potential_energies = [] | units.J
kinetic_energies = [] | units.J
thermal_energies = [] | units.J
for time, i_step in [(i * t_end / n_steps, i)
for i in range(0, n_steps + 1)]:
hydro_code.evolve_model(time)
times.append(time)
potential_energies.append(hydro_code.potential_energy)
kinetic_energies.append(hydro_code.kinetic_energy)
thermal_energies.append(hydro_code.thermal_energy)
hydro_plot([-1.0, 1.0, -1.0, 1.0] * (350 | units.RSun), hydro_code,
(100, 100),
os.path.join(
get_path_to_results(),
"supernova_hydro_image{0:=03}.png".format(i_step)))
energy_plot(
times, kinetic_energies, potential_energies, thermal_energies,
os.path.join(get_path_to_results(), "supernova_energy_evolution.png"))
hydro_code.stop()
print "All done!\n"
def head_on_stellar_merger(
masses=[0.3, 3.0] | units.MSun,
star_age=310.0 | units.Myr,
initial_separation=4.0 | units.RSun,
angle=numpy.pi / 3,
initial_speed=3000.0 | units.km / units.s,
initial_speed_perpendicular=30.0 | units.km / units.s,
number_of_sph_particles=50000,
t_end=1.0e4 | units.s,
sph_code=Fi,
):
"""
masses: Mass of the two stars
star_age: Initial age of the stars
number_of_sph_particles: Total number of particles of both stars, divided
according to their masses
t_end: (Physical, not computational) duration of the hydrodynamics
simulation
sph_code: Code to use for the hydrodynamics simulation
"""
# Convert some of the input parameters to string, for use in output file
# names:
n_string = "n" + ("%1.0e" % (number_of_sph_particles)
).replace("+0", "").replace("+", "")
t_end_string = "t" + ("%1.0e" % (t_end.value_in(units.s))
).replace("+0", "").replace("+", "")
base_output_file_name = os.path.join(
get_path_to_results(), "stellar_merger_"+n_string+"_"+t_end_string)
stars = Particles(2)
stars.mass = masses
try:
stellar_evolution = MESA()
stellar_evolution.initialize_code()
except:
print "MESA was not built. Returning."
return
stellar_evolution.commit_parameters()
stellar_evolution.particles.add_particles(stars)
stellar_evolution.commit_particles()
print "Evolving stars with MESA..."
stellar_evolution.evolve_model(star_age)
number_of_sph_particles_1 = int(
round(
number_of_sph_particles
* (
stellar_evolution.particles[0].mass
/ stellar_evolution.particles.mass.sum()
)
)
)
number_of_sph_particles_2 = (
number_of_sph_particles - number_of_sph_particles_1
)
print "Creating initial conditions from a MESA stellar evolution model:"
print(
stellar_evolution.particles[0].mass,
"star consisting of", number_of_sph_particles_1, "particles."
)
sph_particles_1 = convert_stellar_model_to_SPH(
stellar_evolution.particles[0],
number_of_sph_particles_1,
seed=12345
).gas_particles
print(
stellar_evolution.particles[1].mass,
"star consisting of", number_of_sph_particles_2, "particles."
)
sph_particles_2 = convert_stellar_model_to_SPH(
stellar_evolution.particles[1],
number_of_sph_particles_2
).gas_particles
initial_separation += stellar_evolution.particles.radius.sum()
sph_particles_2.x += numpy.cos(angle) * initial_separation
sph_particles_2.y += numpy.sin(angle) * initial_separation
sph_particles_1.vx += numpy.cos(angle) * initial_speed - \
numpy.sin(angle) * initial_speed_perpendicular
sph_particles_1.vy += numpy.cos(angle) * initial_speed_perpendicular + \
numpy.sin(angle) * initial_speed
view = [-0.5, 0.5, -0.5, 0.5] * \
(initial_separation + stellar_evolution.particles.radius.sum())
stellar_evolution.stop()
all_sph_particles = ParticlesSuperset([sph_particles_1, sph_particles_2])
all_sph_particles.move_to_center()
unit_converter = ConvertBetweenGenericAndSiUnits(
1.0 | units.RSun, constants.G, t_end)
hydro_legacy_code = sph_code(unit_converter)
n_steps = 100
hydro_legacy_code.parameters.n_smooth = 96
try:
hydro_legacy_code.parameters.timestep = t_end / n_steps
except Exception as exc:
if "parameter is read-only" not in str(exc):
raise
hydro_legacy_code.gas_particles.add_particles(all_sph_particles)
print "Evolving to t =", t_end, " (using", sph_code.__name__, "SPH code)."
for time, i_step in [(i*t_end/n_steps, i) for i in range(1, n_steps+1)]:
hydro_legacy_code.evolve_model(time)
if not i_step % 4:
hydro_plot(
view,
hydro_legacy_code,
(300, 300),
base_output_file_name +
"_hydro_image{0:=03}.png".format(i_step)
)
hydro_legacy_code.stop()
print "All done!\n"