DiagonalPreconditioner.H

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License
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Class
    Foam::DiagonalPreconditioner

Description
    Diagonal preconditioner for both symmetric and asymmetric matrices.

    The inverse (reciprocal for scalar) of the diagonal is calculated and
    stored.

SourceFiles
    DiagonalPreconditioner.C

\*---------------------------------------------------------------------------*/

#ifndef DiagonalPreconditioner_H
#define DiagonalPreconditioner_H

#include "LduMatrix.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{

/*---------------------------------------------------------------------------*\
                           Class DiagonalPreconditioner Declaration
\*---------------------------------------------------------------------------*/

template<class Type, class DType, class LUType>
class DiagonalPreconditioner
:
    public LduMatrix<Type, DType, LUType>::preconditioner
{
    // Private Data

        //- The inverse (reciprocal for scalar) diagonal
        Field<DType> rD;


public:

    //- Runtime type information
    TypeName("diagonal");


    // Constructors

        //- Construct from matrix components and preconditioner data dictionary
        DiagonalPreconditioner
        (
            const typename LduMatrix<Type, DType, LUType>::solver& sol,
            const dictionary& preconditionerDict
        );

        //- Disallow default bitwise copy construction
        DiagonalPreconditioner(const DiagonalPreconditioner&) = delete;


    // Destructor

        virtual ~DiagonalPreconditioner()
        {}


    // Member Functions

        //- Read and reset the preconditioner parameters from the given
        //  dictionary
        virtual void read(const dictionary& preconditionerDict);

        //- Return wA the preconditioned form of residual rA
        virtual void precondition
        (
            Field<Type>& wA,
            const Field<Type>& rA
        ) const;

        //- Return wT the transpose-matrix preconditioned form of
        //  residual rT.
        virtual void preconditionT
        (
            Field<Type>& wT,
            const Field<Type>& rT
        ) const
        {
            return(precondition(wT, rT));
        }


    // Member Operators

        //- Disallow default bitwise assignment
        void operator=(const DiagonalPreconditioner&) = delete;
};


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#ifdef NoRepository
    #include "DiagonalPreconditioner.C"
#endif

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //