ExaDG::MultigridPreconditionerBase< dim, Number, MultigridNumber_ > Class Template Reference

Inheritance diagram for ExaDG::MultigridPreconditionerBase< dim, Number, MultigridNumber_ >:

Public Types
typedef MultigridNumber_	MultigridNumber
Public Types inherited from ExaDG::PreconditionerBase< Number >
typedef dealii::LinearAlgebra::distributed::Vector< Number >	VectorType

Public Member Functions
	MultigridPreconditionerBase (MPI_Comm const &comm)
void	initialize (MultigridData const &data, std::shared_ptr< Grid< dim > const > grid, std::shared_ptr< MultigridMappings< dim, Number > > const multigrid_mappings, dealii::FiniteElement< dim > const &fe, bool const operator_is_singular, Map_DBC const &dirichlet_bc, Map_DBC_ComponentMask const &dirichlet_bc_component_mask, bool const initialize_preconditioners)
void	update () override
void	vmult (VectorType &dst, VectorType const &src) const override
unsigned int	solve (VectorType &dst, VectorType const &src) const
virtual void	apply_smoother_on_fine_level (VectorTypeMG &dst, VectorTypeMG const &src) const
std::shared_ptr< TimerTree >	get_timings () const override
Public Member Functions inherited from ExaDG::PreconditionerBase< Number >
bool	needs_update () const

Protected Types
typedef std::map< dealii::types::boundary_id, std::shared_ptr< dealii::Function< dim > > >	Map_DBC
typedef std::map< dealii::types::boundary_id, dealii::ComponentMask >	Map_DBC_ComponentMask
typedef std::vector< dealii::GridTools::PeriodicFacePair< typename dealii::Triangulation< dim >::cell_iterator > >	PeriodicFacePairs
typedef dealii::LinearAlgebra::distributed::Vector< Number >	VectorType
typedef dealii::LinearAlgebra::distributed::Vector< MultigridNumber >	VectorTypeMG

Protected Member Functions
void	initialize_mapping ()
virtual void	initialize_matrix_free_objects ()
void	update_matrix_free_objects ()
void	update_smoothers ()
void	update_coarse_solver ()
virtual void	initialize_dof_handler_and_constraints (bool is_singular, unsigned int const n_components, Map_DBC const &dirichlet_bc, Map_DBC_ComponentMask const &dirichlet_bc_component_mask)
void	do_initialize_dof_handler_and_constraints (bool is_singular, unsigned int const n_components, Map_DBC const &dirichlet_bc, Map_DBC_ComponentMask const &dirichlet_bc_component_mask, dealii::MGLevelObject< std::shared_ptr< dealii::DoFHandler< dim > const > > &dofhandlers, dealii::MGLevelObject< std::shared_ptr< dealii::AffineConstraints< MultigridNumber > > > &constraints)
virtual void	initialize_transfer_operators ()
void	do_initialize_transfer_operators (std::shared_ptr< MultigridTransfer< dim, MultigridNumber, VectorTypeMG > > &transfers, unsigned int const dof_index)
unsigned int	get_number_of_levels () const
void	for_all_levels (std::function< void(unsigned int const)> const &function_on_level)
void	for_all_smoothing_levels (std::function< void(unsigned int const)> const &function_on_level)
void	transfer_from_fine_to_coarse_levels (std::function< void(unsigned int const, unsigned int const)> const &levelwise_transfer)

Protected Attributes
std::shared_ptr< Grid< dim > const >	grid
std::shared_ptr< MultigridMappings< dim, Number > >	multigrid_mappings
dealii::MGLevelObject< std::shared_ptr< dealii::DoFHandler< dim > const > >	dof_handlers
dealii::MGLevelObject< std::shared_ptr< dealii::AffineConstraints< MultigridNumber > > >	constraints
dealii::MGLevelObject< std::shared_ptr< MatrixFreeData< dim, MultigridNumber > > >	matrix_free_data_objects
dealii::MGLevelObject< std::shared_ptr< dealii::MatrixFree< dim, MultigridNumber > > >	matrix_free_objects
dealii::MGLevelObject< std::shared_ptr< Operator > >	operators
std::shared_ptr< MultigridTransfer< dim, MultigridNumber, VectorTypeMG > >	transfers
std::vector< MGLevelInfo >	level_info
Protected Attributes inherited from ExaDG::PreconditionerBase< Number >
bool	update_needed

Member Function Documentation

for_all_levels()

template<int dim, typename Number , typename MultigridNumber_ = float>

void ExaDG::MultigridPreconditionerBase< dim, Number, MultigridNumber_ >::for_all_levels ( std::function< void(unsigned int const)> const & function_on_level )

inlineprotected

This is a generic function allowing to loop over all multigrid levels (including the coarsest level). The operation to be performed on each level is passed as a lambda with argument level.

for_all_smoothing_levels()

template<int dim, typename Number , typename MultigridNumber_ = float>

void ExaDG::MultigridPreconditionerBase< dim, Number, MultigridNumber_ >::for_all_smoothing_levels ( std::function< void(unsigned int const)> const & function_on_level )

inlineprotected

This is a generic function allowing to loop over all smoothing levels (excluding the coarsest level). The operation to be performed on each level is passed as a lambda with argument level.

get_number_of_levels()

template<int dim, typename Number , typename MultigridNumber >

unsigned int ExaDG::MultigridPreconditionerBase< dim, Number, MultigridNumber >::get_number_of_levels ( ) const

protected

Returns the number of levels.

The number of levels includes the coarse level and the finer smoothing levels, i.e. n_levels = 1 if the multigrid preconditioner is a coarse-grid solve on the coarse level only.

get_timings()

template<int dim, typename Number , typename MultigridNumber >

std::shared_ptr< TimerTree > ExaDG::MultigridPreconditionerBase< dim, Number, MultigridNumber >::get_timings ( ) const

overridevirtual

Reimplemented from ExaDG::PreconditionerBase< Number >.

transfer_from_fine_to_coarse_levels()

template<int dim, typename Number , typename MultigridNumber_ = float>

void ExaDG::MultigridPreconditionerBase< dim, Number, MultigridNumber_ >::transfer_from_fine_to_coarse_levels ( std::function< void(unsigned int const, unsigned int const)> const & levelwise_transfer )

inlineprotected

This is a generic function allowing to successively transfer information from the fine level to all coarser multigrid levels. The operation to be performed for a transfer between two successive levels is passed as a lambda with fine_level as the first argument and coarse_level as the second argument.

update()

template<int dim, typename Number , typename MultigridNumber >

void ExaDG::MultigridPreconditionerBase< dim, Number, MultigridNumber >::update ( )

overridevirtual

Implements ExaDG::PreconditionerBase< Number >.

update_coarse_solver()

template<int dim, typename Number , typename MultigridNumber >

void ExaDG::MultigridPreconditionerBase< dim, Number, MultigridNumber >::update_coarse_solver ( )

protected

This function updates the coarse-grid solver. The prerequisite to call this function is that the coarse-grid operator has been updated.

update_smoothers()

template<int dim, typename Number , typename MultigridNumber >

void ExaDG::MultigridPreconditionerBase< dim, Number, MultigridNumber >::update_smoothers ( )

protected

This function updates the smoother for all smoothing levels. The prerequisite to call this function is that the multigrid operators have been updated.

vmult()

template<int dim, typename Number , typename MultigridNumber >

void ExaDG::MultigridPreconditionerBase< dim, Number, MultigridNumber >::vmult ( VectorType & dst, VectorType const & src ) const

overridevirtual

Implements ExaDG::PreconditionerBase< Number >.

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

• include/exadg/solvers_and_preconditioners/multigrid/multigrid_preconditioner_base.h
• include/exadg/solvers_and_preconditioners/multigrid/multigrid_preconditioner_base.cpp