DiagonalPreconditioner.H

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/*---------------------------------------------------------------------------*\
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-------------------------------------------------------------------------------
    Copyright (C) 2011-2016 OpenFOAM Foundation
    Copyright (C) 2019 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
    You should have received a copy of the GNU General Public 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;
 
 
    // Private Member Functions
 
        //- No copy construct
        DiagonalPreconditioner(const DiagonalPreconditioner&) = delete;
 
        //- No copy assignment
        void operator=(const DiagonalPreconditioner&) = delete;
 
 
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
        );
 
 
    // Destructor
 
        virtual ~DiagonalPreconditioner() = default;
 
 
    // 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));
        }
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "DiagonalPreconditioner.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //