def run(kn=1.0, dt=0.01, nt=1000, coll="linear", scheme="Euler"):
config = collision.utils.CollisionConfig.from_json(
"./examples/linear_transport/configs/" + "linear" + ".json"
)
vmesh = collision.CartesianMesh(config)
if coll == "linear":
coll_op = collision.LinearCollision(config, vmesh)
elif coll == "rbm":
coll_op = collision.RandomBatchLinearCollision(config, vmesh)
else:
raise NotImplementedError(
"Collision method {} is not implemented.".format(coll)
)
solver = pykinetic.BoltzmannSolver0D(collision_operator=coll_op, kn=kn)
if "RK" in scheme:
solver.time_integrator = "RK"
solver.a = rkcoeff[scheme]["a"]
solver.b = rkcoeff[scheme]["b"]
solver.c = rkcoeff[scheme]["c"]
else:
solver.time_integrator = scheme
solver.dt = dt
domain = pykinetic.Domain([])
state = pykinetic.State(domain, vmesh, 1)
qinit(state, vmesh)
sol = pykinetic.Solution(state, domain)
output_dict = {}
sol_frames, macro_frames, ts, l2_errs = (
[copy.deepcopy(sol)],
[compute_rho(sol.state, vmesh)],
[0.0],
l2_err(sol, vmesh),
)
pbar = Progbar(nt)
for t in range(nt):
solver.evolve_to_time(sol)
l2_errs.append(l2_err(sol, vmesh))
sol_frames.append([copy.deepcopy(sol), l2_err])
macro_frames.append(compute_rho(sol.state, vmesh))
ts.append(0.0 + (t + 1) * dt)
pbar.update(t + 1, finalize=False)
pbar.update(nt, finalize=True)
output_dict["macro_frames"] = macro_frames
output_dict["t"] = ts
return output_dict
def run(kn=1.0, tau=0.1, p=1.0, dt=0.01, nt=1000, scheme="Euler"):
config = collision.utils.CollisionConfig.from_json(
"./configs/penalty.json")
vmesh = collision.SpectralMesh(config)
coll_op = collision.FSInelasticVHSCollision(config, vmesh)
tau = tau * kn
print("tau is {}.".format(tau))
if scheme == "BEuler":
solver = PenalizationSolver0D(collision_operator=coll_op,
penalty=p,
kn=kn,
heat_bath=tau)
solver.time_integrator = "BEuler"
else:
solver = pykinetic.BoltzmannSolver0D(collision_operator=coll_op,
kn=kn,
heat_bath=tau)
if "RK" in scheme:
print("OK")
solver.time_integrator = "RK"
solver.a = rkcoeff[scheme]["a"]
solver.b = rkcoeff[scheme]["b"]
solver.c = rkcoeff[scheme]["c"]
else:
solver.time_integrator = scheme
solver.dt = dt
domain = pykinetic.Domain([])
state = pykinetic.State(domain, vdof=vmesh.nvs)
qinit(state, vmesh)
sol = pykinetic.Solution(state, domain)
sol_frames = []
T_frames = []
pbar = Progbar(nt)
for t in range(nt):
solver.evolve_to_time(sol)
T_frames.append(vmesh.get_p(sol.q)[-1])
sol_frames.append(copy.deepcopy(sol))
pbar.update(t + 1, finalize=False)
pbar.update(nt, finalize=True)
return T_frames, sol_frames, vmesh, coll_op, solver
def run(kn=1.0, dt=0.01, nt=1000, eps=(1.0, 1.0), coll="fsm", scheme="Euler"):
config = collision.utils.CollisionConfig.from_json("./configs/" + coll +
".json")
vmesh = collision.SpectralMesh(config)
if coll == "fsm":
coll_op = collision.FSInelasticVHSCollision(config, vmesh)
elif coll == "rbm":
coll_op = collision.RandomBatchCollisionV2(config, vmesh)
a, b = eps
coll_op.eps = a * vmesh.delta**b
else:
raise NotImplementedError(
"Collision method {} is not implemented.".format(coll))
solver = pykinetic.BoltzmannSolver0D(collision_operator=coll_op, kn=kn)
if "RK" in scheme:
solver.time_integrator = "RK"
solver.a = rkcoeff[scheme]["a"]
solver.b = rkcoeff[scheme]["b"]
solver.c = rkcoeff[scheme]["c"]
else:
solver.time_integrator = scheme
solver.dt = dt
domain = pykinetic.Domain([])
state = pykinetic.State(domain, vdof=vmesh.nvs)
qinit(state, vmesh)
sol = pykinetic.Solution(state, domain)
sol_frames = []
macro_frames = []
pbar = Progbar(nt)
for t in range(nt):
solver.evolve_to_time(sol)
l2_err = (np.sqrt(np.sum(
(sol.q - bkw_fn(vmesh, sol.t))**2)) * vmesh.delta)
sol_frames.append([copy.deepcopy(sol), l2_err])
macro_frames.append(vmesh.get_p(sol.q))
# sol_frames.append(copy.deepcopy(sol))
pbar.update(t + 1, finalize=False)
pbar.update(nt, finalize=True)
return macro_frames, sol_frames, vmesh.delta
def run(
kn=lambda x, y: 1.0,
sigma_s=lambda x, y: 1.0,
sigma_a=lambda x, y: 0.0,
Q=lambda x, y: 0.0,
xmin=[0.0, 0.0],
xmax=[1.0, 1.0],
nx=40,
dt=0.01,
nt=1000,
coll="linear",
scheme="Euler",
BC="periodic",
f_l=lambda vx, vy: 0.0,
f_b=lambda vx, vy: 0.0,
f_r=lambda vx, vy: 0.0,
f_t=lambda vx, vy: 0.0,
init_func=lambda vmesh, u, T, rho: 0.0,
):
# Load config
config = collision.utils.CollisionConfig.from_json(
"./examples/linear_transport/configs/" + "parity_2d" + ".json")
# Collision
vmesh = collision.PolarMesh(config)
# print(vmesh.centers[0], vmesh.weights)
if coll == "linear":
coll_op = collision.LinearCollision(config, vmesh)
elif coll == "rbm":
coll_op = collision.RandomBatchLinearCollision(config, vmesh)
elif coll == "rbm_symm":
coll_op = collision.SymmetricRBMLinearCollision(config, vmesh)
else:
raise NotImplementedError(
"Collision method {} is not implemented.".format(coll))
# x domian
x = pykinetic.Dimension(xmin[0], xmax[0], nx, name="x")
y = pykinetic.Dimension(xmin[1], xmax[1], nx, name="y")
# print(x.centers_with_ghost(2))
domain = pykinetic.Domain([x, y])
# Riemann solver
rp = pykinetic.riemann.parity_2D
solver = APNeutronTransportSolver2D(
rp,
[coll_op],
kn=kn(x.centers, y.centers),
sigma_s=sigma_s(x.centers, y.centers),
sigma_a=sigma_a(x.centers, y.centers),
Q=Q(x.centers, y.centers),
)
# print(solver.kn)
solver.order = 1
# solver.lim_type = -1
solver.time_integrator = scheme
solver.dt = dt
print("dt is {}".format(solver.dt))
# sigma = sigma_s(x.centers, y.centers) + kn(
# x.centers, y.centers
# ) ** 2 * sigma_a(x.centers, y.centers)
# sigma_l, sigma_r = None, None
# if isinstance(sigma, np.ndarray):
# sigma_l, sigma_r = sigma[0], sigma[-1]
# else:
# sigma_l = sigma_r = sigma
# kn_l, kn_r = None, None
# if isinstance(solver.kn, np.ndarray):
# kn_l, kn_r = solver.kn[0], solver.kn[-1]
# else:
# kn_l = kn_r = solver.kn
# Boundary conditions
def dirichlet_lower_BC(state, dim, t, qbc, auxbc, num_ghost):
vx, vy = state.problem_data["v"]
if dim.name == "x":
for i in range(num_ghost):
qbc[::2, i] = -qbc[::2, num_ghost + i]
qbc[1::2, i] = (
2 * (-vx * 2 * qbc[::2, num_ghost] / state.grid.delta[0]) -
qbc[1::2, num_ghost + i])
elif dim.name == "y":
for i in range(num_ghost):
qbc[::2, :, i] = -qbc[::2, :, num_ghost + i]
qbc[1::2, :, i] = (
2 *
(-vy * 2 * qbc[::2, :, num_ghost] / state.grid.delta[1]) -
qbc[1::2, :, num_ghost + i])
qbc[1, :, i] = -qbc[1, :, i]
else:
raise ValueError("Dim could be only x or y.")
def dirichlet_upper_BC(state, dim, t, qbc, auxbc, num_ghost):
vx, vy = state.problem_data["v"]
if dim.name == "x":
for i in range(num_ghost):
qbc[::2, -i - 1] = -qbc[::2, -2 * num_ghost + i]
qbc[1::2, -i - 1] = (
2 *
(vx * 2 * qbc[::2, -num_ghost - 1] / state.grid.delta[0]) -
qbc[1::2, -2 * num_ghost + i])
elif dim.name == "y":
for i in range(num_ghost):
qbc[::2, :, -i - 1] = -qbc[::2, :, -2 * num_ghost + i]
qbc[1::2, :,
-i - 1] = (2 * (vy * 2 * qbc[::2, :, -num_ghost - 1] /
state.grid.delta[1]) -
qbc[1::2, :, -2 * num_ghost + i])
qbc[1, :, -i - 1] = -qbc[1, :, -i - 1]
else:
raise ValueError("Dim could be only x or y.")
if BC == "periodic":
solver.all_bcs = pykinetic.BC.periodic
elif BC == "dirichlet":
solver.all_bcs = pykinetic.BC.custom
solver.user_bc_lower = dirichlet_lower_BC
solver.user_bc_upper = dirichlet_upper_BC
else:
raise ValueError("Given BC type is not avaliable!")
state = pykinetic.State(domain, vmesh, 4)
state.problem_data["v"] = vmesh.centers
state.problem_data["phi"] = phi(solver.kn)
state.problem_data["sqrt_phi"] = np.sqrt(phi(solver.kn))
qinit(state, vmesh, solver.kn, init_func)
sol = pykinetic.Solution(state, domain)
output_dict = {}
sol_frames, macro_frames, ts = (
[copy.deepcopy(sol)],
[compute_rho(sol.state, vmesh)],
[0.0],
)
pbar = Progbar(nt)
for t in range(nt):
solver.evolve_to_time(sol)
sol_frames.append(copy.deepcopy(sol))
macro_frames.append(compute_rho(sol.state, vmesh))
ts.append(0.0 + (t + 1) * dt)
pbar.update(t + 1, finalize=False)
pbar.update(nt, finalize=True)
output_dict["macro_frames"] = macro_frames
output_dict["mesh"] = state.c_centers
output_dict["t"] = ts
return output_dict
def run(
kn=1.0,
sigma_s=lambda x: 1.0,
sigma_a=lambda x: 0.0,
Q=lambda x: 0.0,
xmin=0.0,
xmax=1.0,
nx=40,
dt=0.01,
nt=1000,
coll="linear",
scheme="Euler",
BC="periodic",
f_l=lambda v: 1.0,
f_r=lambda v: 0.0,
init_func=lambda vmesh, u, T, rho: 0.0,
):
# Load config
config = collision.utils.CollisionConfig.from_json(
"./linear_transport/configs/" + "linear" + ".json")
# Collision
vmesh = collision.CartesianMesh(config)
if coll == "linear":
coll_op = collision.LinearCollision(config, vmesh)
elif coll == "rbm":
coll_op = collision.RandomBatchLinearCollision(config, vmesh)
elif coll == "rbm_symm":
coll_op = collision.SymmetricRBMLinearCollision(config, vmesh)
else:
raise NotImplementedError(
"Collision method {} is not implemented.".format(coll))
# x domian
x = pykinetic.Dimension(xmin, xmax, nx, name="x")
domain = pykinetic.Domain([x])
# Riemann solver
rp = pykinetic.riemann.advection_1D
solver = DiffusiveRegimeSolver1D(
rp,
[coll_op],
kn=kn(x.centers),
sigma_s=sigma_s(x.centers),
sigma_a=sigma_a(x.centers),
Q=Q(x.centers),
)
solver.order = 1
# solver.lim_type = 2
# Time integrator
if "RK" in scheme:
solver.time_integrator = "RK"
solver.a = rkcoeff[scheme]["a"]
solver.b = rkcoeff[scheme]["b"]
solver.c = rkcoeff[scheme]["c"]
else:
solver.time_integrator = scheme
solver.dt = dt
print("dt is {}".format(solver.dt))
# Boundary condition
def dirichlet_lower_BC(state, dim, t, qbc, auxbc, num_ghost):
v = state.problem_data["v"][0]
for i in range(num_ghost):
qbc[0, i, v > 0] = f_l(v[v > 0])
def dirichlet_upper_BC(state, dim, t, qbc, auxbc, num_ghost):
v = state.problem_data["v"][0]
for i in range(num_ghost):
qbc[0, -i - 1, v < 0] = f_r(v[v < 0])
if BC == "periodic":
solver.bc_lower[0] = pykinetic.BC.periodic
solver.bc_upper[0] = pykinetic.BC.periodic
elif BC == "dirichlet":
solver.bc_lower[0] = pykinetic.BC.custom
solver.bc_upper[0] = pykinetic.BC.custom
solver.user_bc_lower = dirichlet_lower_BC
solver.user_bc_upper = dirichlet_upper_BC
else:
raise ValueError("Given BC type is not avaliable!")
state = pykinetic.State(domain, vmesh, 1)
state.problem_data["v"] = vmesh.centers
qinit(state, vmesh, init_func)
sol = pykinetic.Solution(state, domain)
output_dict = {}
sol_frames, macro_frames, ts = (
[copy.deepcopy(sol.q)],
[compute_rho(sol.state, vmesh)],
[0.0],
)
pbar = Progbar(nt)
for t in range(nt):
solver.evolve_to_time(sol)
if (t + 1) % 1 == 0:
sol_frames.append(copy.deepcopy(sol.q))
macro_frames.append(compute_rho(sol.state, vmesh))
ts.append(sol.t)
pbar.update(t + 1, finalize=False)
pbar.update(nt, finalize=True)
output_dict["f_frames"] = np.asarray(sol_frames)[:, 0]
output_dict["macro_frames"] = np.asarray(macro_frames)
output_dict["x"] = np.asarray(x.centers)
output_dict["t"] = np.asarray(ts)
output_dict["v"] = np.asarray(vmesh.centers[0])
return output_dict
def run(
kn=1e-4,
tau=None,
dt=0.001,
nt=100,
eps=(0.2, 2.0),
coll="fsm",
scheme="Euler",
euler_solver=False,
):
config = collision.utils.CollisionConfig.from_json("./configs/" + coll +
".json")
vmesh = collision.SpectralMesh(config)
if coll == "fsm":
coll_op = collision.FSInelasticVHSCollision(config, vmesh)
elif coll == "rbm":
coll_op = collision.RandomBatchCollisionV2(config, vmesh)
a, b = eps
coll_op.eps = a * vmesh.delta**b
else:
raise NotImplementedError(
"Collision method {} is not implemented.".format(coll))
rp = pykinetic.riemann.advection_1D
solver = pykinetic.BoltzmannSolver1D(rp,
coll_op,
kn=kn,
heat_bath=tau,
device="gpu")
if "RK" in scheme:
solver.time_integrator = "RK"
solver.a = rkcoeff[scheme]["a"]
solver.b = rkcoeff[scheme]["b"]
solver.c = rkcoeff[scheme]["c"]
else:
solver.time_integrator = scheme
solver.dt = dt
print("dt is {}".format(solver.dt))
solver.order = 2
solver.lim_type = -1
solver.bc_lower[0] = pykinetic.BC.periodic
solver.bc_upper[0] = pykinetic.BC.periodic
x = pykinetic.Dimension(0.0, 1.0, 100, name="x")
domain = pykinetic.Domain([x])
state = pykinetic.State(domain, vdof=vmesh.nvs)
state.problem_data["v"] = vmesh.centers
qinit(state, vmesh)
sol = pykinetic.Solution(state, domain)
output_dict = {}
if euler_solver:
euler = Euler1D(tau)
euler.set_initial(vmesh.get_p(sol.q)[0], 0, 1.0)
euler.solve(dt * nt)
output_dict["euler_macro"] = euler.macros(2)
sol_frames = []
macro_frames = []
pbar = Progbar(nt)
for t in range(nt):
solver.evolve_to_time(sol)
# l2_err = (
# np.sqrt(np.sum((sol.q - bkw_fn(vmesh, sol.t)) ** 2))
# * vmesh.delta
# )
# sol_frames.append([copy.deepcopy(sol), l2_err])
macro_frames.append(vmesh.get_p(sol.q))
sol_frames.append(copy.deepcopy(sol))
pbar.update(t + 1, finalize=False)
pbar.update(nt, finalize=True)
output_dict["macro_frames"] = macro_frames
return output_dict
def run(
kn=lambda x: 1.0,
sigma_s=lambda x: 1.0,
sigma_a=lambda x: 0.0,
Q=lambda x: 0.0,
xmin=0.0,
xmax=1.0,
nx=40,
dt=0.01,
nt=1000,
coll="linear",
scheme="Euler",
BC="periodic",
f_l=lambda v: 1.0,
f_r=lambda v: 0.0,
init_func=lambda vmesh, u, T, rho: 0.0,
):
# Load config
config = collision.utils.CollisionConfig.from_json(
"./linear_transport/configs/" + "parity" + ".json")
# Collision
vmesh = collision.CartesianMesh(config)
# print(vmesh.centers[0], vmesh.weights)
if coll == "linear":
coll_op = collision.LinearCollision(config, vmesh)
elif coll == "rbm":
coll_op = collision.RandomBatchLinearCollision(config, vmesh)
elif coll == "rbm_symm":
coll_op = collision.SymmetricRBMLinearCollision(config, vmesh)
else:
raise NotImplementedError(
"Collision method {} is not implemented.".format(coll))
# x domian
x = pykinetic.Dimension(xmin, xmax, nx, name="x")
# print(x.centers_with_ghost(2))
domain = pykinetic.Domain([x])
# Riemann solver
rp = pykinetic.riemann.parity_1D
solver = APNeutronTransportSolver1D(
rp,
[coll_op],
kn=kn(x.centers),
sigma_s=sigma_s(x.centers),
sigma_a=sigma_a(x.centers),
Q=Q(x.centers),
)
# print(solver.kn)
solver.order = 1
# solver.lim_type = -1
solver.time_integrator = scheme
solver.dt = dt
print("dt is {}".format(solver.dt))
sigma = sigma_s(x.centers) + kn(x.centers)**2 * sigma_a(x.centers)
sigma_l, sigma_r = None, None
if isinstance(sigma, np.ndarray):
sigma_l, sigma_r = sigma[0], sigma[-1]
else:
sigma_l = sigma_r = sigma
kn_l, kn_r = None, None
if isinstance(solver.kn, np.ndarray):
kn_l, kn_r = solver.kn[0], solver.kn[-1]
else:
kn_l = kn_r = solver.kn
# Boundary conditions
def dirichlet_lower_BC(state, dim, t, qbc, auxbc, num_ghost):
v = state.problem_data["v"][0] / sigma_l
kn_dx = kn_l / state.grid.delta[0]
for i in range(num_ghost):
qbc[0,
i, :] = (f_l(v) - (0.5 - kn_dx * v) * qbc[0, num_ghost, :]) / (
0.5 + kn_dx * v)
for i in range(num_ghost):
qbc[1,
i, :] = (2 * f_l(v) -
(qbc[0, num_ghost - 1, :] +
qbc[0, num_ghost, :])) / kn_l - qbc[1, num_ghost, :]
def dirichlet_upper_BC(state, dim, t, qbc, auxbc, num_ghost):
v = state.problem_data["v"][0] / sigma_r
kn_dx = kn_r / state.grid.delta[0]
for i in range(num_ghost):
qbc[0, -i -
1, :] = (f_r(v) -
(0.5 - kn_dx * v) * qbc[0, -num_ghost - 1, :]) / (
0.5 + kn_dx * v)
for i in range(num_ghost):
qbc[1, -i -
1, :] = ((qbc[0, -num_ghost, :] + qbc[0, -num_ghost - 1, :]) -
2 * f_r(v)) / kn_r - qbc[1, -num_ghost - 1, :]
if BC == "periodic":
solver.bc_lower[0] = pykinetic.BC.periodic
solver.bc_upper[0] = pykinetic.BC.periodic
elif BC == "dirichlet":
solver.bc_lower[0] = pykinetic.BC.custom
solver.bc_upper[0] = pykinetic.BC.custom
solver.user_bc_lower = dirichlet_lower_BC
solver.user_bc_upper = dirichlet_upper_BC
else:
raise ValueError("Given BC type is not avaliable!")
state = pykinetic.State(domain, vmesh, 2)
state.problem_data["v"] = vmesh.centers
state.problem_data["phi"] = phi(solver.kn)
state.problem_data["sqrt_phi"] = np.sqrt(phi(solver.kn))
qinit(state, vmesh, solver.kn, init_func)
sol = pykinetic.Solution(state, domain)
output_dict = {}
sol_frames, macro_frames, ts = (
[copy.deepcopy(sol.q)],
[compute_rho(sol.state, vmesh)],
[0.0],
)
pbar = Progbar(nt)
for t in range(nt):
solver.evolve_to_time(sol)
sol_frames.append(copy.deepcopy(sol.q))
macro_frames.append(compute_rho(sol.state, vmesh))
# Test
# qbc = solver.qbc
# print(
# np.max(
# np.abs(
# 5.0 * np.sin(vmesh.centers[0])
# - (
# 0.5 * (qbc[0, 1] + qbc[0, 2])
# + kn * 0.5 * (qbc[1, 1] + qbc[1, 2])
# )
# )
# )
# )
ts.append(0.0 + (t + 1) * dt)
pbar.update(t + 1, finalize=False)
pbar.update(nt, finalize=True)
output_dict["f_frames"] = np.asarray(sol_frames)
output_dict["macro_frames"] = macro_frames
output_dict["x"] = x.centers
output_dict["t"] = ts
output_dict["v"] = np.asarray(vmesh.centers[0])
return output_dict
def run(
kn=1.0,
sigma_s=lambda x, y: 1.0,
sigma_a=lambda x, y: 0.0,
Q=lambda x, y: 0.0,
xmin=[0.0, 0.0],
xmax=[1.0, 1.0],
nx=40,
dt=0.01,
nt=1000,
coll="linear",
scheme="Euler",
BC="periodic",
f_l=lambda vx, vy: 0.0,
f_b=lambda vx, vy: 0.0,
f_r=lambda vx, vy: 0.0,
f_t=lambda vx, vy: 0.0,
init_func=lambda vmesh, u, T, rho: 0.0,
):
# Load config
config = collision.utils.CollisionConfig.from_json(
"./examples/linear_transport/configs/" + "linear_2d" + ".json"
)
# Collision
vmesh = collision.PolarMesh(config)
if coll == "linear":
coll_op = collision.LinearCollision(config, vmesh)
elif coll == "rbm":
coll_op = collision.RandomBatchLinearCollision(config, vmesh)
elif coll == "rbm_symm":
coll_op = collision.SymmetricRBMLinearCollision(config, vmesh)
else:
raise NotImplementedError(
"Collision method {} is not implemented.".format(coll)
)
# x domian
x = pykinetic.Dimension(xmin[0], xmax[0], nx, name="x")
y = pykinetic.Dimension(xmin[1], xmax[1], nx, name="y")
domain = pykinetic.Domain([x, y])
# Riemann solver
rp = pykinetic.riemann.advection_2D
solver = DiffusiveRegimeSolver2D(
rp,
coll_op,
kn=kn(x.centers, y.centers),
sigma_s=sigma_s(x.centers, y.centers),
sigma_a=sigma_a(x.centers, y.centers),
Q=Q(x.centers, y.centers),
)
solver.order = 1
# solver.lim_type = 2
# Time integrator
solver.time_integrator = scheme
solver.dt = dt
print("dt is {}".format(solver.dt))
# Boundary condition
def dirichlet_lower_BC(state, dim, t, qbc, auxbc, num_ghost):
vx, vy = state.problem_data["v"]
if dim.name == "x":
for i in range(num_ghost):
qbc[0, i, :, (vx > 0)[0], :] = f_l(vx[(vx > 0)[0]], vy)
elif dim.name == "y":
for i in range(num_ghost):
qbc[0, :, i, :, (vy > 0)[:, 0]] = f_b(vx, vy[(vy > 0)[:, 0]])
else:
raise ValueError("Dim could be only x or y.")
def dirichlet_upper_BC(state, dim, t, qbc, auxbc, num_ghost):
vx, vy = state.problem_data["v"]
if dim.name == "x":
for i in range(num_ghost):
qbc[0, -i - 1, :, (vx < 0)[0], :] = f_r(vx[(vx < 0)[0]], vy)
elif dim.name == "y":
for i in range(num_ghost):
qbc[0, :, -i - 1, :, (vy < 0)[:, 0]] = f_t(vx, vy[(vy < 0)[:, 0]])
else:
raise ValueError("Dim could be only 'x' or 'y'.")
if BC == "periodic":
solver.all_bcs = pykinetic.BC.periodic
elif BC == "dirichlet":
solver.all_bcs = pykinetic.BC.custom
solver.user_bc_lower = dirichlet_lower_BC
solver.user_bc_upper = dirichlet_upper_BC
else:
raise ValueError("Given BC type is not avaliable!")
state = pykinetic.State(domain, vmesh, 1)
state.problem_data["v"] = vmesh.centers
qinit(state, vmesh, init_func)
sol = pykinetic.Solution(state, domain)
output_dict = {}
sol_frames, macro_frames, ts = (
[copy.deepcopy(sol)],
[compute_rho(sol.state, vmesh)],
[0.0],
)
pbar = Progbar(nt)
for t in range(nt):
solver.evolve_to_time(sol)
sol_frames.append(copy.deepcopy(sol))
macro_frames.append(compute_rho(sol.state, vmesh))
ts.append(0.0 + (t + 1) * dt)
pbar.update(t + 1, finalize=False)
pbar.update(nt, finalize=True)
output_dict["macro_frames"] = macro_frames
output_dict["mesh"] = state.c_centers
output_dict["t"] = ts
return output_dict
def run(kn=1e-4, tau=None, p=5.0, dt=0.001, nt=100, scheme="Euler"):
config = collision.utils.CollisionConfig.from_json(
"./examples/boltzmann/configs/penalty.json")
vmesh = collision.SpectralMesh(config)
rp = pykinetic.riemann.advection_1D
coll_op = collision.FSInelasticVHSCollision(config, vmesh)
if scheme == "BEuler":
solver = PenalizationSolver1D(rp,
coll_op,
penalty=p,
kn=kn,
heat_bath=tau,
device="gpu")
solver.time_integrator = "BEuler"
else:
solver = pykinetic.BoltzmannSolver1D(rp,
coll_op,
kn=kn,
heat_bath=tau,
device="gpu")
if "RK" in scheme:
solver.time_integrator = "RK"
solver.a = rkcoeff[scheme]["a"]
solver.b = rkcoeff[scheme]["b"]
solver.c = rkcoeff[scheme]["c"]
else:
solver.time_integrator = scheme
solver.dt = dt
print("dt is {}".format(solver.dt))
# solver.order = 2
solver.lim_type = 2
solver.bc_lower[0] = pykinetic.BC.periodic
solver.bc_upper[0] = pykinetic.BC.periodic
x = pykinetic.Dimension(0.0, 1.0, 100, name="x")
domain = pykinetic.Domain([x])
state = pykinetic.State(domain, vdof=vmesh.nvs)
state.problem_data["v"] = vmesh.centers
qinit(state, vmesh)
sol = pykinetic.Solution(state, domain)
euler = Euler1D(tau)
euler.set_initial(vmesh.get_p(sol.q)[0], 0, 1.0)
sol_frames = []
macro_frames = []
pbar = Progbar(nt)
for t in range(nt):
solver.evolve_to_time(sol)
# l2_err = (
# np.sqrt(np.sum((sol.q - bkw_fn(vmesh, sol.t)) ** 2))
# * vmesh.delta
# )
# sol_frames.append([copy.deepcopy(sol), l2_err])
macro_frames.append(vmesh.get_p(sol.q))
sol_frames.append(copy.deepcopy(sol))
pbar.update(t + 1, finalize=False)
pbar.update(nt, finalize=True)
euler.solve(dt * nt)
return macro_frames, euler.macros(2)