Enumerations
enum class	PolynomialCoarseningSequenceType { bisect , decrease_by_one , go_to_one }

Functions
unsigned int	create_next_polynomial_coarsening_degree (const unsigned int degree, const PolynomialCoarseningSequenceType &p_sequence)

std::vector< unsigned int >	create_polynomial_coarsening_sequence (const unsigned int max_degree, const PolynomialCoarseningSequenceType &p_sequence)

template<int dim, int spacedim>
std::vector< std::shared_ptr< const Triangulation< dim, spacedim > > >	create_geometric_coarsening_sequence (const Triangulation< dim, spacedim > &tria)

Detailed Description

Global coarsening utility functions.

Enumeration Type Documentation

◆ PolynomialCoarseningSequenceType

enum class MGTransferGlobalCoarseningTools::PolynomialCoarseningSequenceType

strong

Common polynomial coarsening sequences.

Note: These polynomial coarsening sequences up to a degree of 9 are precompiled in MGTwoLevelTransfer. See also: MGTwoLevelTransfer::fast_polynomial_transfer_supported()

Enumerator
bisect	Half polynomial degree by integer division. For example, for degree=7 the following sequence would be obtained:: 7 -> 3 -> 1
decrease_by_one	Decrease the polynomial degree by one. E.g., for degree=7 following sequence would result: 7 -> 6 -> 5 -> 4 -> 3 -> 2 -> 1
go_to_one	Decrease the polynomial degree to one. E.g., for degree=7 following sequence would result: 7 -> 1

Definition at line 52 of file mg_transfer_global_coarsening.h.

Function Documentation

◆ create_next_polynomial_coarsening_degree()

unsigned int MGTransferGlobalCoarseningTools::create_next_polynomial_coarsening_degree	(	const unsigned int	degree,
		const PolynomialCoarseningSequenceType &	p_sequence
	)

For a given degree and polynomial coarsening sequence p_sequence, determine the next coarser degree.

Definition at line 23 of file mg_transfer_global_coarsening.cc.

◆ create_polynomial_coarsening_sequence()

std::vector< unsigned int > MGTransferGlobalCoarseningTools::create_polynomial_coarsening_sequence	(	const unsigned int	max_degree,
		const PolynomialCoarseningSequenceType &	p_sequence
	)

For a given max_degree and polynomial coarsening sequence p_sequence, determine the full sequence of polynomial degrees, sorted in ascending order.

Definition at line 44 of file mg_transfer_global_coarsening.cc.

◆ create_geometric_coarsening_sequence()

template<int dim, int spacedim>

std::vector< std::shared_ptr< const Triangulation< dim, spacedim > > > MGTransferGlobalCoarseningTools::create_geometric_coarsening_sequence ( const Triangulation< dim, spacedim > & tria )

For a given triangulation tria, determine the geometric coarsening sequence by repeated global coarsening of the provided triangulation.

Note: For convenience, a reference to the input triangulation is stored in the last entry of the return vector.; Currently, only implemented for parallel::distributed::Triangulation.

Enumerations