ISTL::BlockPreconditioner Class Reference

#include <ISTLSolParams.h>

Inheritance diagram for ISTL::BlockPreconditioner:

Collaboration diagram for ISTL::BlockPreconditioner:

Public Member Functions
Dune::SolverCategory::Category	category () const
	The category the preconditioner is part of.
	BlockPreconditioner (const ISTL::Mat &A, const DomainDecomposition &dd_, const std::string &schurType)
	Constructor. More...
	~BlockPreconditioner () override
	Destructor.
void	pre (ISTL::Vec &x, ISTL::Vec &b) override
	Preprocess preconditioner.
void	apply (ISTL::Vec &v, const ISTL::Vec &d) override
	Applies the preconditioner. More...
void	post (ISTL::Vec &x) override
	Post-process function.
std::unique_ptr< ISTL::Preconditioner > &	getBlockPre (size_t block)
	Obtain reference to a block preconditioner.
ISTL::Mat &	getBlock (size_t block)
	Obtain reference to a block matrix.
ISTL::Operator &	getBlockOp (size_t block)
	Obtain matrix adaptor for a block matrix.

Static Protected Member Functions
static void	extractBlock (ISTL::Mat &B, const ISTL::Mat &A, const std::set< int > &eqs_row, const std::set< int > &eqs_col, const std::map< int, int > &eqs_col_g2l)
	Build block from block equations.
static void	subtractMatrices (ISTL::Mat &A, const ISTL::Mat &B, const ISTL::Mat &C)
	Find A = B - C.

Protected Attributes
std::vector< std::unique_ptr< ISTL::Preconditioner > >	blockPre
	The preconditioners.
std::vector< std::unique_ptr< ISTL::Operator > >	blockOp
	The matrix adaptors for the blocks.
std::vector< ISTL::Mat >	blocks
	Matrix blocks.
const DomainDecomposition &	dd
	Domain decomposition.

Detailed Description

This implements a Schur-decomposition based preconditioner for the block system [A B] [C D]

The preconditioner is [Apre B] [ P] Here Apre is some preconditioner for A and P some preconditioner for S = D - C*diag(A)^-1*B. The B block may be dropped. !

Constructor & Destructor Documentation

BlockPreconditioner()

ISTL::BlockPreconditioner::BlockPreconditioner	(	const ISTL::Mat &	A,
		const DomainDecomposition &	dd_,
		const std::string &	schurType
	)

Constructor.

Parameters

[in]	A	The system matrix
[in]	dd_	Domain decomposition
[in]	schurType	Type of schur decomposition to use

References blockOp, blockPre, blocks, dd, extractBlock(), DomainDecomposition::getBlockEqs(), DomainDecomposition::getG2LEQ(), DomainDecomposition::getNoBlocks(), and subtractMatrices().

Member Function Documentation

apply()

void ISTL::BlockPreconditioner::apply ( ISTL::Vec &  v, const ISTL::Vec &  d  )

override

Applies the preconditioner.

Parameters

[out]	v	The resulting vector
[in]	d	The vector to apply the preconditioner to

References blockPre, blocks, dd, DomainDecomposition::getBlockEqs(), and DomainDecomposition::getNoBlocks().

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

• src/LinAlg/ISTLSolParams.h
• src/LinAlg/ISTLSolParams.C