def _CreateScheme(self):
domain_size = self.GetComputingModelPart().ProcessInfo[
KratosMultiphysics.DOMAIN_SIZE]
# Cases in which the element manages the time integration
if self.element_integrates_in_time:
# "Fake" scheme for those cases in where the element manages the time integration
# It is required to perform the nodal update once the current time step is solved
scheme = KratosTrilinos.TrilinosResidualBasedIncrementalUpdateStaticSchemeSlip(
domain_size, domain_size + 1)
# In case the BDF2 scheme is used inside the element, set the time discretization utility to compute the BDF coefficients
if (self.settings["time_scheme"].GetString() == "bdf2"):
time_order = 2
self.time_discretization = KratosMultiphysics.TimeDiscretization.BDF(
time_order)
else:
err_msg = "Requested elemental time scheme " + self.settings[
"time_scheme"].GetString() + " is not available.\n"
err_msg += "Available options are: \"bdf2\""
raise Exception(err_msg)
# Cases in which a time scheme manages the time integration
else:
# Bossak time integration scheme
if self.settings["time_scheme"].GetString() == "bossak":
# TODO: Can we remove this periodic check, Is the PATCH_INDEX used in this scheme?
if self.settings["consider_periodic_conditions"].GetBool(
) == True:
scheme = TrilinosFluid.TrilinosPredictorCorrectorVelocityBossakSchemeTurbulent(
self.settings["alpha"].GetDouble(), domain_size,
KratosCFD.PATCH_INDEX)
else:
scheme = TrilinosFluid.TrilinosPredictorCorrectorVelocityBossakSchemeTurbulent(
self.settings["alpha"].GetDouble(),
self.settings["move_mesh_strategy"].GetInt(),
domain_size)
# BDF2 time integration scheme
elif self.settings["time_scheme"].GetString() == "bdf2":
scheme = TrilinosFluid.TrilinosBDF2TurbulentScheme()
# Time scheme for steady state fluid solver
elif self.settings["time_scheme"].GetString() == "steady":
scheme = TrilinosFluid.TrilinosResidualBasedSimpleSteadyScheme(
self.settings["velocity_relaxation"].GetDouble(),
self.settings["pressure_relaxation"].GetDouble(),
domain_size)
return scheme
def Initialize(self):
## Construct the communicator
self.EpetraCommunicator = KratosTrilinos.CreateCommunicator()
if hasattr(self, "_turbulence_model_solver"):
self._turbulence_model_solver.SetCommunicator(
self.EpetraCommunicator)
## Get the computing model part
self.computing_model_part = self.GetComputingModelPart()
## If needed, create the estimate time step utility
if (self.settings["time_stepping"]["automatic_time_step"].GetBool()):
self.EstimateDeltaTimeUtility = self._GetAutomaticTimeSteppingUtility(
)
## Creating the Trilinos convergence criteria
if (self.settings["time_scheme"].GetString() == "bossak"):
self.conv_criteria = KratosTrilinos.TrilinosUPCriteria(
self.settings["relative_velocity_tolerance"].GetDouble(),
self.settings["absolute_velocity_tolerance"].GetDouble(),
self.settings["relative_pressure_tolerance"].GetDouble(),
self.settings["absolute_pressure_tolerance"].GetDouble())
elif (self.settings["time_scheme"].GetString() == "steady"):
self.conv_criteria = KratosTrilinos.TrilinosResidualCriteria(
self.settings["relative_velocity_tolerance"].GetDouble(),
self.settings["absolute_velocity_tolerance"].GetDouble())
(self.conv_criteria).SetEchoLevel(self.settings["echo_level"].GetInt())
## Creating the Trilinos time scheme
if (self.element_integrates_in_time):
# "Fake" scheme for those cases in where the element manages the time integration
# It is required to perform the nodal update once the current time step is solved
self.time_scheme = KratosTrilinos.TrilinosResidualBasedIncrementalUpdateStaticSchemeSlip(
self.computing_model_part.ProcessInfo[
KratosMultiphysics.DOMAIN_SIZE],
self.computing_model_part.ProcessInfo[
KratosMultiphysics.DOMAIN_SIZE] + 1)
# In case the BDF2 scheme is used inside the element, set the time discretization utility to compute the BDF coefficients
if (self.settings["time_scheme"].GetString() == "bdf2"):
time_order = self.settings["time_order"].GetInt()
if time_order == 2:
self.time_discretization = KratosMultiphysics.TimeDiscretization.BDF(
time_order)
else:
raise Exception(
"Only \"time_order\" equal to 2 is supported. Provided \"time_order\": "
+ str(time_order))
else:
err_msg = "Requested elemental time scheme " + self.settings[
"time_scheme"].GetString() + " is not available.\n"
err_msg += "Available options are: \"bdf2\""
raise Exception(err_msg)
else:
if not hasattr(self, "_turbulence_model_solver"):
if self.settings["time_scheme"].GetString() == "bossak":
# TODO: Can we remove this periodic check, Is the PATCH_INDEX used in this scheme?
if self.settings["consider_periodic_conditions"].GetBool(
) == True:
self.time_scheme = TrilinosFluid.TrilinosPredictorCorrectorVelocityBossakSchemeTurbulent(
self.settings["alpha"].GetDouble(),
self.computing_model_part.ProcessInfo[
KratosMultiphysics.DOMAIN_SIZE],
KratosCFD.PATCH_INDEX)
else:
self.time_scheme = TrilinosFluid.TrilinosPredictorCorrectorVelocityBossakSchemeTurbulent(
self.settings["alpha"].GetDouble(),
self.settings["move_mesh_strategy"].GetInt(),
self.computing_model_part.ProcessInfo[
KratosMultiphysics.DOMAIN_SIZE])
elif self.settings["time_scheme"].GetString() == "steady":
self.time_scheme = TrilinosFluid.TrilinosResidualBasedSimpleSteadyScheme(
self.settings["velocity_relaxation"].GetDouble(),
self.settings["pressure_relaxation"].GetDouble(),
self.computing_model_part.ProcessInfo[
KratosMultiphysics.DOMAIN_SIZE])
else:
self._turbulence_model_solver.Initialize()
if self.settings["time_scheme"].GetString() == "bossak":
self.time_scheme = TrilinosFluid.TrilinosPredictorCorrectorVelocityBossakSchemeTurbulent(
self.settings["alpha"].GetDouble(),
self.settings["move_mesh_strategy"].GetInt(),
self.computing_model_part.ProcessInfo[
KratosMultiphysics.DOMAIN_SIZE],
self.settings["turbulence_model_solver_settings"]
["velocity_pressure_relaxation_factor"].GetDouble(),
self._turbulence_model_solver.
GetTurbulenceSolvingProcess())
# Time scheme for steady state fluid solver
elif self.settings["time_scheme"].GetString() == "steady":
self.time_scheme = TrilinosFluid.TrilinosResidualBasedSimpleSteadyScheme(
self.settings["velocity_relaxation"].GetDouble(),
self.settings["pressure_relaxation"].GetDouble(),
self.computing_model_part.ProcessInfo[
KratosMultiphysics.DOMAIN_SIZE],
self._turbulence_model_solver.
GetTurbulenceSolvingProcess())
## Set the guess_row_size (guess about the number of zero entries) for the Trilinos builder and solver
if self.main_model_part.ProcessInfo[
KratosMultiphysics.DOMAIN_SIZE] == 3:
guess_row_size = 20 * 4
elif self.main_model_part.ProcessInfo[
KratosMultiphysics.DOMAIN_SIZE] == 2:
guess_row_size = 10 * 3
## Construct the Trilinos builder and solver
if self.settings["consider_periodic_conditions"].GetBool() == True:
self.builder_and_solver = KratosTrilinos.TrilinosBlockBuilderAndSolverPeriodic(
self.EpetraCommunicator, guess_row_size,
self.trilinos_linear_solver, KratosCFD.PATCH_INDEX)
else:
self.builder_and_solver = KratosTrilinos.TrilinosBlockBuilderAndSolver(
self.EpetraCommunicator, guess_row_size,
self.trilinos_linear_solver)
## Construct the Trilinos Newton-Raphson strategy
self.solver = KratosTrilinos.TrilinosNewtonRaphsonStrategy(
self.main_model_part, self.time_scheme,
self.trilinos_linear_solver, self.conv_criteria,
self.builder_and_solver,
self.settings["maximum_iterations"].GetInt(),
self.settings["compute_reactions"].GetBool(),
self.settings["reform_dofs_at_each_step"].GetBool(),
self.settings["move_mesh_flag"].GetBool())
(self.solver).SetEchoLevel(self.settings["echo_level"].GetInt())
self.formulation.SetProcessInfo(self.computing_model_part)
(self.solver).Initialize()
KratosMultiphysics.Logger.Print(
"Monolithic MPI solver initialization finished.")