GAMGPreconditioner.C

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    A nd           | Copyright (C) 1991-2010 OpenCFD Ltd.
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License
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#include <OpenFOAM/GAMGPreconditioner.H>

// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

namespace Foam
{
    defineTypeNameAndDebug(GAMGPreconditioner, 0);

    lduMatrix::preconditioner::addsymMatrixConstructorToTable
    <GAMGPreconditioner> addGAMGPreconditionerSymMatrixConstructorToTable_;

    lduMatrix::preconditioner::addasymMatrixConstructorToTable
    <GAMGPreconditioner> addGAMGPreconditionerAsymMatrixConstructorToTable_;
}


// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

Foam::GAMGPreconditioner::GAMGPreconditioner
(
    const lduMatrix::solver& sol,
    const dictionary& solverControls
)
:
    GAMGSolver
    (
        sol.fieldName(),
        sol.matrix(),
        sol.interfaceBouCoeffs(),
        sol.interfaceIntCoeffs(),
        sol.interfaces(),
        solverControls
    ),
    lduMatrix::preconditioner(sol),
    nVcycles_(2)
{
    readControls();
}


// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //

Foam::GAMGPreconditioner::~GAMGPreconditioner()
{}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

void Foam::GAMGPreconditioner::readControls()
{
    GAMGSolver::readControls();
    nVcycles_ = controlDict_.lookupOrDefault<label>("nVcycles", 2);
}


void Foam::GAMGPreconditioner::precondition
(
    scalarField& wA,
    const scalarField& rA,
    const direction cmpt
) const
{
    wA = 0.0;
    scalarField AwA(wA.size());
    scalarField finestCorrection(wA.size());
    scalarField finestResidual(rA);

    // Create coarse grid correction fields
    PtrList<scalarField> coarseCorrFields;

    // Create coarse grid sources
    PtrList<scalarField> coarseSources;

    // Create the smoothers for all levels
    PtrList<lduMatrix::smoother> smoothers;

    // Initialise the above data structures
    initVcycle(coarseCorrFields, coarseSources, smoothers);

    for (label cycle=0; cycle<nVcycles_; cycle++)
    {
        Vcycle
        (
            smoothers,
            wA,
            rA,
            AwA,
            finestCorrection,
            finestResidual,
            coarseCorrFields,
            coarseSources,
            cmpt
        );

        if (cycle < nVcycles_-1)
        {
            // Calculate finest level residual field
            matrix_.Amul(AwA, wA, interfaceBouCoeffs_, interfaces_, cmpt);
            finestResidual = rA;
            finestResidual -= AwA;
        }
    }
}


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