FDICPreconditioner.H

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Class
    Foam::FDICPreconditioner

Description
    Faster version of the DICPreconditioner diagonal-based incomplete
    Cholesky preconditioner for symmetric matrices
    (symmetric equivalent of DILU) in which the the reciprocal of the
    preconditioned diagonal and the upper coefficients divided by the diagonal
    are calculated and stored.

SourceFiles
    FDICPreconditioner.C

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

#ifndef FDICPreconditioner_H
#define FDICPreconditioner_H

#include "lduMatrix.H"

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

namespace Foam
{

/*---------------------------------------------------------------------------*\
                           Class FDICPreconditioner Declaration
\*---------------------------------------------------------------------------*/

class FDICPreconditioner
:
    public lduMatrix::preconditioner
{
    // Private data

        //- The reciprocal preconditioned diagonal
        scalarField rD_;
        scalarField rDuUpper_;
        scalarField rDlUpper_;


    // Private Member Functions

        //- Disallow default bitwise copy construct
        FDICPreconditioner(const FDICPreconditioner&);

        //- Disallow default bitwise assignment
        void operator=(const FDICPreconditioner&);


public:

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


    // Constructors

        //- Construct from matrix components and preconditioner solver controls
        FDICPreconditioner
        (
            const lduMatrix::solver&,
            const dictionary& solverControlsUnused
        );


    //- Destructor
    virtual ~FDICPreconditioner()
    {}


    // Member Functions

        //- Return wA the preconditioned form of residual rA
        virtual void precondition
        (
            scalarField& wA,
            const scalarField& rA,
            const direction cmpt=0
        ) const;
};


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

} // End namespace Foam

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

#endif

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