MULES.C

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    Copyright (C) 2011-2015 OpenFOAM Foundation
    Copyright (C) 2016-2020 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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    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
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#include "MULES.H"
#include "profiling.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
void Foam::MULES::limitSum(UPtrList<scalarField>& phiPsiCorrs)
{
    const label nPhases = phiPsiCorrs.size();
 
    forAll(phiPsiCorrs[0], facei)
    {
        scalar sumPos = 0;
        scalar sumNeg = 0;
 
        for (label phasei = 0; phasei < nPhases; ++phasei)
        {
            if (phiPsiCorrs[phasei][facei] > 0)
            {
                sumPos += phiPsiCorrs[phasei][facei];
            }
            else
            {
                sumNeg += phiPsiCorrs[phasei][facei];
            }
        }
 
        scalar sum = sumPos + sumNeg;
 
        if (sum > 0 && sumPos > VSMALL)
        {
            scalar lambda = -sumNeg/sumPos;
 
            for (label phasei = 0; phasei < nPhases; ++phasei)
            {
                if (phiPsiCorrs[phasei][facei] > 0)
                {
                    phiPsiCorrs[phasei][facei] *= lambda;
                }
            }
        }
        else if (sum < 0 && sumNeg < -VSMALL)
        {
            scalar lambda = -sumPos/sumNeg;
 
            for (label phasei = 0; phasei < nPhases; ++phasei)
            {
                if (phiPsiCorrs[phasei][facei] < 0)
                {
                    phiPsiCorrs[phasei][facei] *= lambda;
                }
            }
        }
    }
}
 
 
void Foam::MULES::limitSum
(
    const UPtrList<const scalarField>& alphas,
    UPtrList<scalarField>& phiPsiCorrs,
    const labelHashSet& fixed
)
{
    labelHashSet notFixed(identity(phiPsiCorrs.size()));
    notFixed -= fixed;
 
    forAll(phiPsiCorrs[0], facei)
    {
        scalar alphaNotFixed = 0, corrNotFixed = 0;
        for (const label phasei : notFixed)
        {
            alphaNotFixed += alphas[phasei][facei];
            corrNotFixed += phiPsiCorrs[phasei][facei];
        }
 
        scalar corrFixed = 0;
        for (const label phasei : fixed)
        {
            corrFixed += phiPsiCorrs[phasei][facei];
        }
 
        const scalar sumCorr = corrNotFixed + corrFixed;
 
        const scalar lambda = - sumCorr/alphaNotFixed;
 
        for (const label phasei : notFixed)
        {
            phiPsiCorrs[phasei][facei] += lambda*alphas[phasei][facei];
        }
    }
}
 
// ************************************************************************* //