def _RefineMesh(self):
''' This function remeshes the main_model_part according to the distance, using the MMG process from the MeshingApplication.
In order to perform the refinement, it is needed to calculate the distance gradient, the initial nodal_h and the level_set metric.
'''
ini_time=time.time()
local_gradient = KratosMultiphysics.ComputeNodalGradientProcess2D(self.main_model_part, KratosMultiphysics.DISTANCE, KratosMultiphysics.DISTANCE_GRADIENT, KratosMultiphysics.NODAL_AREA)
local_gradient.Execute()
find_nodal_h = KratosMultiphysics.FindNodalHNonHistoricalProcess(self.main_model_part)
find_nodal_h.Execute()
KratosMultiphysics.VariableUtils().SetNonHistoricalVariableToZero(KratosMultiphysics.MeshingApplication.METRIC_TENSOR_2D,self.main_model_part.Nodes)
metric_process = MeshingApplication.ComputeLevelSetSolMetricProcess2D(self.main_model_part, KratosMultiphysics.DISTANCE_GRADIENT, self.metric_parameters)
metric_process.Execute()
mmg_parameters = KratosMultiphysics.Parameters("""
{
"discretization_type" : "STANDARD",
"save_external_files" : false,
"initialize_entities" : false,
"echo_level" : 0
}
""")
mmg_process = MeshingApplication.MmgProcess2D(self.main_model_part, mmg_parameters)
mmg_process.Execute()
KratosMultiphysics.Logger.PrintInfo('LevelSetRemeshing','Remesh time: ',time.time()-ini_time)
def _CreateMetricsProcess(self):
self.metric_processes = []
if self.strategy == "LevelSet":
level_set_parameters = KratosMultiphysics.Parameters("""{}""")
level_set_parameters.AddValue("minimal_size",self.settings["minimal_size"])
level_set_parameters.AddValue("maximal_size",self.settings["maximal_size"])
level_set_parameters.AddValue("sizing_parameters",self.settings["sizing_parameters"])
level_set_parameters.AddValue("enforce_current",self.settings["enforce_current"])
level_set_parameters.AddValue("anisotropy_remeshing",self.settings["anisotropy_remeshing"])
level_set_parameters.AddValue("anisotropy_parameters",self.settings["anisotropy_parameters"])
level_set_parameters["anisotropy_parameters"].RemoveValue("boundary_layer_min_size_ratio")
if self.domain_size == 2:
self.metric_processes.append(MeshingApplication.ComputeLevelSetSolMetricProcess2D(self.main_model_part, self.gradient_variable, level_set_parameters))
else:
self.metric_processes.append(MeshingApplication.ComputeLevelSetSolMetricProcess3D(self.main_model_part, self.gradient_variable, level_set_parameters))
elif self.strategy == "Hessian":
hessian_parameters = KratosMultiphysics.Parameters("""{}""")
hessian_parameters.AddValue("minimal_size",self.settings["minimal_size"])
hessian_parameters.AddValue("maximal_size",self.settings["maximal_size"])
hessian_parameters.AddValue("enforce_current",self.settings["enforce_current"])
hessian_parameters.AddValue("hessian_strategy_parameters",self.settings["hessian_strategy_parameters"])
hessian_parameters["hessian_strategy_parameters"].RemoveValue("metric_variable")
hessian_parameters.AddValue("anisotropy_remeshing",self.settings["anisotropy_remeshing"])
hessian_parameters.AddValue("enforce_anisotropy_relative_variable",self.settings["enforce_anisotropy_relative_variable"])
hessian_parameters.AddValue("enforced_anisotropy_parameters",self.settings["anisotropy_parameters"])
hessian_parameters["enforced_anisotropy_parameters"].RemoveValue("boundary_layer_min_size_ratio")
for current_metric_variable in self.metric_variable:
self.metric_processes.append(MeshingApplication.ComputeHessianSolMetricProcess(self.main_model_part, current_metric_variable, hessian_parameters))
elif self.strategy == "superconvergent_patch_recovery":
if not structural_dependencies:
raise Exception("You need to compile the StructuralMechanicsApplication in order to use this criteria")
# We compute the error
error_compute_parameters = KratosMultiphysics.Parameters("""{}""")
error_compute_parameters.AddValue("stress_vector_variable", self.settings["compute_error_extra_parameters"]["stress_vector_variable"])
error_compute_parameters.AddValue("echo_level", self.settings["echo_level"])
if self.domain_size == 2:
self.error_compute = StructuralMechanicsApplication.SPRErrorProcess2D(self.main_model_part, error_compute_parameters)
else:
self.error_compute = StructuralMechanicsApplication.SPRErrorProcess3D(self.main_model_part, error_compute_parameters)
# Now we compute the metric
error_metric_parameters = KratosMultiphysics.Parameters("""{}""")
error_metric_parameters.AddValue("minimal_size",self.settings["minimal_size"])
error_metric_parameters.AddValue("maximal_size",self.settings["maximal_size"])
error_metric_parameters.AddValue("target_error",self.settings["error_strategy_parameters"]["error_metric_parameters"]["interpolation_error"])
error_metric_parameters.AddValue("set_target_number_of_elements", self.settings["error_strategy_parameters"]["set_target_number_of_elements"])
error_metric_parameters.AddValue("target_number_of_elements", self.settings["error_strategy_parameters"]["target_number_of_elements"])
error_metric_parameters.AddValue("perform_nodal_h_averaging", self.settings["error_strategy_parameters"]["perform_nodal_h_averaging"])
error_metric_parameters.AddValue("echo_level", self.settings["echo_level"])
if self.domain_size == 2:
self.metric_process = MeshingApplication.MetricErrorProcess2D(self.main_model_part, error_metric_parameters)
else:
self.metric_process = MeshingApplication.MetricErrorProcess3D(self.main_model_part, error_metric_parameters)
def _CreateMetricsProcess(self):
self.MetricsProcess = []
if (self.strategy == "LevelSet"):
level_set_parameters = KratosMultiphysics.Parameters("""{}""")
level_set_parameters.AddValue("minimal_size",self.params["minimal_size"])
level_set_parameters.AddValue("enforce_current",self.params["enforce_current"])
level_set_parameters.AddValue("anisotropy_remeshing",self.params["anisotropy_remeshing"])
level_set_parameters.AddValue("anisotropy_parameters",self.params["anisotropy_parameters"])
if (self.dim == 2):
self.MetricsProcess.append(MeshingApplication.ComputeLevelSetSolMetricProcess2D(
self.Model[self.model_part_name],
self.gradient_variable,
level_set_parameters))
else:
self.MetricsProcess.append(MeshingApplication.ComputeLevelSetSolMetricProcess3D(
self.Model[self.model_part_name],
self.gradient_variable,
level_set_parameters))
elif (self.strategy == "Hessian"):
hessian_parameters = KratosMultiphysics.Parameters("""{}""")
hessian_parameters.AddValue("minimal_size",self.params["minimal_size"])
hessian_parameters.AddValue("maximal_size",self.params["maximal_size"])
hessian_parameters.AddValue("enforce_current",self.params["enforce_current"])
hessian_parameters.AddValue("hessian_strategy_parameters",self.params["hessian_strategy_parameters"])
hessian_parameters.AddValue("anisotropy_remeshing",self.params["anisotropy_remeshing"])
hessian_parameters.AddValue("anisotropy_parameters",self.params["anisotropy_parameters"])
for current_metric_variable in self.metric_variable:
if (type(current_metric_variable) is KratosMultiphysics.Array1DComponentVariable):
if (self.dim == 2):
self.MetricsProcess.append(MeshingApplication.ComputeHessianSolMetricProcessComp2D(
self.Model[self.model_part_name],
current_metric_variable,
hessian_parameters))
else:
self.MetricsProcess.append(MeshingApplication.ComputeHessianSolMetricProcessComp3D(
self.Model[self.model_part_name],
current_metric_variable,
hessian_parameters))
else:
if (self.dim == 2):
self.MetricsProcess.append(MeshingApplication.ComputeHessianSolMetricProcess2D(
self.Model[self.model_part_name],
current_metric_variable,
hessian_parameters))
else:
self.MetricsProcess.append(MeshingApplication.ComputeHessianSolMetricProcess3D(
self.Model[self.model_part_name],
current_metric_variable,
hessian_parameters))
def _CreateMetricsProcess(self):
""" This method is responsible to create the metrics of the process
Keyword arguments:
self -- It signifies an instance of a class.
"""
self.metric_processes = []
if self.strategy == "LevelSet":
level_set_parameters = KratosMultiphysics.Parameters("""{}""")
level_set_parameters.AddValue("minimal_size",self.settings["minimal_size"])
level_set_parameters.AddValue("maximal_size",self.settings["maximal_size"])
level_set_parameters.AddValue("sizing_parameters",self.settings["sizing_parameters"])
level_set_parameters.AddValue("enforce_current",self.settings["enforce_current"])
level_set_parameters.AddValue("anisotropy_remeshing",self.settings["anisotropy_remeshing"])
level_set_parameters.AddValue("anisotropy_parameters",self.settings["anisotropy_parameters"])
level_set_parameters["anisotropy_parameters"].RemoveValue("boundary_layer_min_size_ratio")
if self.domain_size == 2:
self.metric_processes.append(MeshingApplication.ComputeLevelSetSolMetricProcess2D(self.main_model_part, self.gradient_variable, level_set_parameters))
else:
self.metric_processes.append(MeshingApplication.ComputeLevelSetSolMetricProcess3D(self.main_model_part, self.gradient_variable, level_set_parameters))
elif self.strategy == "Hessian":
hessian_parameters = KratosMultiphysics.Parameters("""{}""")
hessian_parameters.AddValue("minimal_size",self.settings["minimal_size"])
hessian_parameters.AddValue("maximal_size",self.settings["maximal_size"])
hessian_parameters.AddValue("enforce_current",self.settings["enforce_current"])
hessian_parameters.AddValue("hessian_strategy_parameters",self.settings["hessian_strategy_parameters"])
hessian_parameters["hessian_strategy_parameters"].RemoveValue("metric_variable")
hessian_parameters["hessian_strategy_parameters"].RemoveValue("non_historical_metric_variable")
hessian_parameters["hessian_strategy_parameters"].AddEmptyValue("non_historical_metric_variable")
hessian_parameters["hessian_strategy_parameters"].RemoveValue("normalization_factor")
hessian_parameters["hessian_strategy_parameters"].AddEmptyValue("normalization_factor")
hessian_parameters["hessian_strategy_parameters"].RemoveValue("normalization_alpha")
hessian_parameters["hessian_strategy_parameters"].AddEmptyValue("normalization_alpha")
hessian_parameters["hessian_strategy_parameters"].RemoveValue("normalization_method")
hessian_parameters["hessian_strategy_parameters"].AddEmptyValue("normalization_method")
hessian_parameters.AddValue("anisotropy_remeshing",self.settings["anisotropy_remeshing"])
hessian_parameters.AddValue("enforce_anisotropy_relative_variable",self.settings["enforce_anisotropy_relative_variable"])
hessian_parameters.AddValue("enforced_anisotropy_parameters",self.settings["anisotropy_parameters"])
hessian_parameters["enforced_anisotropy_parameters"].RemoveValue("boundary_layer_min_size_ratio")
for current_metric_variable, non_historical_metric_variable, normalization_factor, normalization_alpha, normalization_method in zip(self.metric_variables, self.non_historical_metric_variable, self.normalization_factor, self.normalization_alpha, self.normalization_method):
hessian_parameters["hessian_strategy_parameters"]["non_historical_metric_variable"].SetBool(non_historical_metric_variable)
hessian_parameters["hessian_strategy_parameters"]["normalization_factor"].SetDouble(normalization_factor)
hessian_parameters["hessian_strategy_parameters"]["normalization_alpha"].SetDouble(normalization_alpha)
hessian_parameters["hessian_strategy_parameters"]["normalization_method"].SetString(normalization_method)
self.metric_processes.append(MeshingApplication.ComputeHessianSolMetricProcess(self.main_model_part, current_metric_variable, hessian_parameters))
elif self.strategy == "superconvergent_patch_recovery" or self.strategy == "SPR":
# Generate SPR process
self.error_compute = self._GenerateErrorProcess()
# Now we compute the metric
error_metric_parameters = KratosMultiphysics.Parameters("""{"error_strategy_parameters":{}}""")
error_metric_parameters.AddValue("minimal_size",self.settings["minimal_size"])
error_metric_parameters.AddValue("maximal_size",self.settings["maximal_size"])
error_metric_parameters["error_strategy_parameters"].AddValue("target_error",self.settings["error_strategy_parameters"]["error_metric_parameters"]["interpolation_error"])
error_metric_parameters["error_strategy_parameters"].AddValue("set_target_number_of_elements", self.settings["error_strategy_parameters"]["set_target_number_of_elements"])
error_metric_parameters["error_strategy_parameters"].AddValue("target_number_of_elements", self.settings["error_strategy_parameters"]["target_number_of_elements"])
error_metric_parameters["error_strategy_parameters"].AddValue("perform_nodal_h_averaging", self.settings["error_strategy_parameters"]["perform_nodal_h_averaging"])
error_metric_parameters.AddValue("echo_level", self.settings["echo_level"])
if self.domain_size == 2:
self.metric_process = MeshingApplication.MetricErrorProcess2D(self.main_model_part, error_metric_parameters)
else:
self.metric_process = MeshingApplication.MetricErrorProcess3D(self.main_model_part, error_metric_parameters)
# We define a metric using the ComputeLevelSetSolMetricProcess
level_set_param = KratosMultiphysics.Parameters("""
{
"minimal_size" : 0.25,
"enforce_current" : false,
"anisotropy_remeshing" : true,
"anisotropy_parameters":
{
"hmin_over_hmax_anisotropic_ratio" : 0.1,
"boundary_layer_max_distance" : 1.0,
"interpolation" : "Exponential"
}
}
""")
metric_process = MeshingApplication.ComputeLevelSetSolMetricProcess2D(main_model_part,KratosMultiphysics.DISTANCE_GRADIENT,level_set_param)
metric_process.Execute()
# We create the remeshing process
remesh_param = KratosMultiphysics.Parameters("""{ }""")
mmg_process = MeshingApplication.MmgProcess2D(main_model_part, remesh_param)
mmg_process.Execute()
for node in main_model_part.Nodes:
distance = ((node.X-center_coordinates[0])**2+(node.Y-center_coordinates[1])**2)**0.5 - circle_radious
node.SetSolutionStepValue(KratosMultiphysics.DISTANCE, distance)
# We calculate the gradient of the distance variable
local_gradient.Execute()
# Finally we export to GiD
