ExaDG::MultigridMappings< dim, Number > Class Template Reference

#include <grid.h>

Public Member Functions
	MultigridMappings (std::shared_ptr< dealii::Mapping< dim > > mapping, std::shared_ptr< dealii::Mapping< dim > > mapping_coarse_levels)
	MultigridMappings (std::shared_ptr< MappingDoFVector< dim, Number > > mapping_dof_vector, unsigned int const degree_coarse_mappings)
void	initialize_coarse_mappings (Grid< dim > const &grid, unsigned int const n_h_levels)
dealii::Mapping< dim > const &	get_mapping (unsigned int const h_level, unsigned int const n_h_levels) const

Public Attributes
std::function< void(std::shared_ptr< dealii::Triangulation< dim > const > const &fine_triangulation, std::vector< std::shared_ptr< dealii::Triangulation< dim > const > > const &coarse_triangulations)	lambda_initialize_coarse_mappings )

Detailed Description

template<int dim, typename Number>
class ExaDG::MultigridMappings< dim, Number >

This class handles mappings for use in multigrid.

The lambda function initialize_coarse_mappings() can be overwritten in order to realize a user-specific construction of the mapping on coarser grids.

Constructor & Destructor Documentation

MultigridMappings() [1/2]

template<int dim, typename Number >

ExaDG::MultigridMappings< dim, Number >::MultigridMappings ( std::shared_ptr< dealii::Mapping< dim > > mapping, std::shared_ptr< dealii::Mapping< dim > > mapping_coarse_levels )

inline

Use this constructor if the fine-level mapping is a "normal" dealii::Mapping.

MultigridMappings() [2/2]

template<int dim, typename Number >

ExaDG::MultigridMappings< dim, Number >::MultigridMappings ( std::shared_ptr< MappingDoFVector< dim, Number > > mapping_dof_vector, unsigned int const degree_coarse_mappings )

inline

Use this constructor if the fine-level mapping is of type ExaDG::MappingDoFVector.

Member Function Documentation

get_mapping()

template<int dim, typename Number >

dealii::Mapping< dim > const & ExaDG::MultigridMappings< dim, Number >::get_mapping ( unsigned int const h_level, unsigned int const n_h_levels ) const

inline

Returns the dealii::Mapping for a given h_level of n_h_levels.

initialize_coarse_mappings()

template<int dim, typename Number >

void ExaDG::MultigridMappings< dim, Number >::initialize_coarse_mappings ( Grid< dim > const & grid, unsigned int const n_h_levels )

inline

Initializes the multigrid mappings on coarse h levels.

Member Data Documentation

lambda_initialize_coarse_mappings

template<int dim, typename Number >

std::function<void( std::shared_ptr<dealii::Triangulation<dim> const> const & fine_triangulation, std::vector<std::shared_ptr<dealii::Triangulation<dim> const>> const & coarse_triangulations) ExaDG::MultigridMappings< dim, Number >::lambda_initialize_coarse_mappings)

Initial value:

=
      [&](std::shared_ptr<dealii::Triangulation<dim> const> const & fine_triangulation,
          std::vector<std::shared_ptr<dealii::Triangulation<dim> const>> const &
            coarse_triangulations) {
        AssertThrow(
          mapping_dof_vector_fine_level.get(),
          dealii::ExcMessage(
            "Coarse mappings can not be initialized because fine level mapping is invalid."));
 
        MappingTools::initialize_coarse_mappings<dim, Number>(mapping_dof_vector_coarse_levels,
                                                              degree_coarse_mappings,
                                                              mapping_dof_vector_fine_level,
                                                              fine_triangulation,
                                                              coarse_triangulations);
      }

This function creates coarse mappings of type MappingDoFVector for use in multigrid with h-transfer given a fine level mapping of type MappingDoFVector.

The default implementation uses an interpolation of the fine-level mapping to coarser grids. You can overwrite this function in order to realize a user-specific construction of the mapping on coarser grids.

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The documentation for this class was generated from the following file:

• include/exadg/grid/grid.h