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