GAMGSolverScale.C

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    Copyright (C) 2011-2017 OpenFOAM Foundation
    Copyright (C) 2017-2019 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
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    (at your option) any later version.
 
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
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#include "GAMGSolver.H"
#include "vector2D.H"
 
// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
void Foam::GAMGSolver::scale
(
    solveScalarField& field,
    solveScalarField& Acf,
    const lduMatrix& A,
    const FieldField<Field, scalar>& interfaceLevelBouCoeffs,
    const lduInterfaceFieldPtrsList& interfaceLevel,
    const solveScalarField& source,
    const direction cmpt
) const
{
    A.Amul
    (
        Acf,
        field,
        interfaceLevelBouCoeffs,
        interfaceLevel,
        cmpt
    );
 
 
    const label nCells = field.size();
    solveScalar* __restrict__ fieldPtr = field.begin();
    const solveScalar* const __restrict__ sourcePtr = source.begin();
    const solveScalar* const __restrict__ AcfPtr = Acf.begin();
 
 
    solveScalar scalingFactorNum = 0.0;
    solveScalar scalingFactorDenom = 0.0;
 
    for (label i=0; i<nCells; i++)
    {
        scalingFactorNum += sourcePtr[i]*fieldPtr[i];
        scalingFactorDenom += AcfPtr[i]*fieldPtr[i];
    }
 
    Vector2D<solveScalar> scalingVector(scalingFactorNum, scalingFactorDenom);
    A.mesh().reduce(scalingVector, sumOp<Vector2D<solveScalar>>());
 
    const solveScalar sf =
        scalingVector.x()
       /stabilise(scalingVector.y(), pTraits<solveScalar>::vsmall);
 
    if (debug >= 2)
    {
        Pout<< sf << " ";
    }
 
    const scalarField& D = A.diag();
    const scalar* const __restrict__ DPtr = D.begin();
 
    for (label i=0; i<nCells; i++)
    {
        fieldPtr[i] = sf*fieldPtr[i] + (sourcePtr[i] - sf*AcfPtr[i])/DPtr[i];
    }
}
 
 
// ************************************************************************* //