diagonalPreconditioner.H

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    Copyright (C) 2011 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.
 
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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
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
Class
    Foam::diagonalPreconditioner
 
Group
    grpLduMatrixPreconditioners
 
Description
    Diagonal preconditioner for both symmetric and asymmetric matrices.
 
    The reciprocal of the diagonal is calculated and stored for reuse
    because on most systems '*' is faster than '/'.
 
SourceFiles
    diagonalPreconditioner.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef diagonalPreconditioner_H
#define diagonalPreconditioner_H
 
#include "lduMatrix.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                           Class diagonalPreconditioner Declaration
\*---------------------------------------------------------------------------*/
 
class diagonalPreconditioner
:
    public lduMatrix::preconditioner
{
    // Private data
 
        //- The reciprocal diagonal
        solveScalarField 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 solver controls
        diagonalPreconditioner
        (
            const lduMatrix::solver&,
            const dictionary& solverControlsUnused
        );
 
 
    //- Destructor
    virtual ~diagonalPreconditioner() = default;
 
 
    // Member Functions
 
        //- Return wA the preconditioned form of residual rA
        virtual void precondition
        (
            solveScalarField& wA,
            const solveScalarField& rA,
            const direction cmpt=0
        ) const;
 
        //- Return wT the transpose-matrix preconditioned form of residual rT.
        virtual void preconditionT
        (
            solveScalarField& wT,
            const solveScalarField& rT,
            const direction cmpt=0
        ) const
        {
            return precondition(wT, rT, cmpt);
        }
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //