GAMGSolverScale.C

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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    A nd           | Copyright (C) 2011-2018 OpenFOAM Foundation
     \\/     M anipulation  |
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#include "GAMGSolver.H"
#include "vector2D.H"

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

void Foam::GAMGSolver::scale
(
    scalarField& field,
    scalarField& Acf,
    const lduMatrix& A,
    const FieldField<Field, scalar>& interfaceLevelBouCoeffs,
    const lduInterfaceFieldPtrsList& interfaceLevel,
    const scalarField& source,
    const direction cmpt
) const
{
    A.Amul
    (
        Acf,
        field,
        interfaceLevelBouCoeffs,
        interfaceLevel,
        cmpt
    );

    scalar scalingFactorNum = 0.0;
    scalar scalingFactorDenom = 0.0;

    forAll(field, i)
    {
        scalingFactorNum += source[i]*field[i];
        scalingFactorDenom += Acf[i]*field[i];
    }

    vector2D scalingVector(scalingFactorNum, scalingFactorDenom);
    A.mesh().reduce(scalingVector, sumOp<vector2D>());

    const scalar sf = scalingVector.x()/stabilise(scalingVector.y(), vSmall);

    if (debug >= 2)
    {
        Pout<< sf << " ";
    }

    const scalarField& D = A.diag();

    forAll(field, i)
    {
        field[i] = sf*field[i] + (source[i] - sf*Acf[i])/D[i];
    }
}


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