faceLimitedGrads.C

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    Copyright (C) 2011-2016 OpenFOAM Foundation
    Copyright (C) 2021 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 "faceLimitedGrad.H"
#include "gaussGrad.H"
#include "fvMesh.H"
#include "volMesh.H"
#include "surfaceMesh.H"
#include "volFields.H"
#include "fixedValueFvPatchFields.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
makeFvGradScheme(faceLimitedGrad)
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
template<>
Foam::tmp<Foam::volVectorField>
Foam::fv::faceLimitedGrad<Foam::scalar>::calcGrad
(
    const volScalarField& vsf,
    const word& name
) const
{
    const fvMesh& mesh = vsf.mesh();
 
    tmp<volVectorField> tGrad = basicGradScheme_().calcGrad(vsf, name);
 
    if (k_ < SMALL)
    {
        return tGrad;
    }
 
    volVectorField& g = tGrad.ref();
 
    const labelUList& owner = mesh.owner();
    const labelUList& neighbour = mesh.neighbour();
 
    const volVectorField& C = mesh.C();
    const surfaceVectorField& Cf = mesh.Cf();
 
    // create limiter
    scalarField limiter(vsf.primitiveField().size(), 1.0);
 
    const scalar rk = (1.0/k_ - 1.0);
 
    forAll(owner, facei)
    {
        const label own = owner[facei];
        const label nei = neighbour[facei];
 
        const scalar vsfOwn = vsf[own];
        const scalar vsfNei = vsf[nei];
 
        scalar maxFace = max(vsfOwn, vsfNei);
        scalar minFace = min(vsfOwn, vsfNei);
        const scalar maxMinFace = rk*(maxFace - minFace);
        maxFace += maxMinFace;
        minFace -= maxMinFace;
 
        // owner side
        limitFace
        (
            limiter[own],
            maxFace - vsfOwn, minFace - vsfOwn,
            (Cf[facei] - C[own]) & g[own]
        );
 
        // neighbour side
        limitFace
        (
            limiter[nei],
            maxFace - vsfNei, minFace - vsfNei,
            (Cf[facei] - C[nei]) & g[nei]
        );
    }
 
    const volScalarField::Boundary& bsf = vsf.boundaryField();
 
    forAll(bsf, patchi)
    {
        const fvPatchScalarField& psf = bsf[patchi];
 
        const labelUList& pOwner = mesh.boundary()[patchi].faceCells();
        const vectorField& pCf = Cf.boundaryField()[patchi];
 
        if (psf.coupled())
        {
            const scalarField psfNei(psf.patchNeighbourField());
 
            forAll(pOwner, pFacei)
            {
                const label own = pOwner[pFacei];
 
                const scalar vsfOwn = vsf[own];
                const scalar vsfNei = psfNei[pFacei];
 
                scalar maxFace = max(vsfOwn, vsfNei);
                scalar minFace = min(vsfOwn, vsfNei);
                const scalar maxMinFace = rk*(maxFace - minFace);
                maxFace += maxMinFace;
                minFace -= maxMinFace;
 
                limitFace
                (
                    limiter[own],
                    maxFace - vsfOwn, minFace - vsfOwn,
                    (pCf[pFacei] - C[own]) & g[own]
                );
            }
        }
        else if (psf.fixesValue())
        {
            forAll(pOwner, pFacei)
            {
                const label own = pOwner[pFacei];
 
                const scalar vsfOwn = vsf[own];
                const scalar vsfNei = psf[pFacei];
 
                scalar maxFace = max(vsfOwn, vsfNei);
                scalar minFace = min(vsfOwn, vsfNei);
                const scalar maxMinFace = rk*(maxFace - minFace);
                maxFace += maxMinFace;
                minFace -= maxMinFace;
 
                limitFace
                (
                    limiter[own],
                    maxFace - vsfOwn, minFace - vsfOwn,
                    (pCf[pFacei] - C[own]) & g[own]
                );
            }
        }
    }
 
    if (fv::debug)
    {
        auto limits = gMinMax(limiter);
        auto avg = gAverage(limiter);
 
        Info<< "gradient limiter for: " << vsf.name()
            << " min = " << limits.min()
            << " max = " << limits.max()
            << " average: " << avg << endl;
    }
 
    g.primitiveFieldRef() *= limiter;
    g.correctBoundaryConditions();
    gaussGrad<scalar>::correctBoundaryConditions(vsf, g);
 
    return tGrad;
}
 
 
template<>
Foam::tmp<Foam::volTensorField>
Foam::fv::faceLimitedGrad<Foam::vector>::calcGrad
(
    const volVectorField& vvf,
    const word& name
) const
{
    const fvMesh& mesh = vvf.mesh();
 
    tmp<volTensorField> tGrad = basicGradScheme_().calcGrad(vvf, name);
 
    if (k_ < SMALL)
    {
        return tGrad;
    }
 
    volTensorField& g = tGrad.ref();
 
    const labelUList& owner = mesh.owner();
    const labelUList& neighbour = mesh.neighbour();
 
    const volVectorField& C = mesh.C();
    const surfaceVectorField& Cf = mesh.Cf();
 
    // create limiter
    scalarField limiter(vvf.primitiveField().size(), 1.0);
 
    const scalar rk = (1.0/k_ - 1.0);
 
    forAll(owner, facei)
    {
        const label own = owner[facei];
        const label nei = neighbour[facei];
 
        const vector& vvfOwn = vvf[own];
        const vector& vvfNei = vvf[nei];
 
        // owner side
        vector gradf((Cf[facei] - C[own]) & g[own]);
 
        scalar vsfOwn = gradf & vvfOwn;
        scalar vsfNei = gradf & vvfNei;
 
        scalar maxFace = max(vsfOwn, vsfNei);
        scalar minFace = min(vsfOwn, vsfNei);
        const scalar maxMinFace = rk*(maxFace - minFace);
        maxFace += maxMinFace;
        minFace -= maxMinFace;
 
        limitFace
        (
            limiter[own],
            maxFace - vsfOwn, minFace - vsfOwn,
            magSqr(gradf)
        );
 
 
        // neighbour side
        gradf = (Cf[facei] - C[nei]) & g[nei];
 
        vsfOwn = gradf & vvfOwn;
        vsfNei = gradf & vvfNei;
 
        maxFace = max(vsfOwn, vsfNei);
        minFace = min(vsfOwn, vsfNei);
 
        limitFace
        (
            limiter[nei],
            maxFace - vsfNei, minFace - vsfNei,
            magSqr(gradf)
        );
    }
 
 
    const volVectorField::Boundary& bvf = vvf.boundaryField();
 
    forAll(bvf, patchi)
    {
        const fvPatchVectorField& psf = bvf[patchi];
 
        const labelUList& pOwner = mesh.boundary()[patchi].faceCells();
        const vectorField& pCf = Cf.boundaryField()[patchi];
 
        if (psf.coupled())
        {
            const vectorField psfNei(psf.patchNeighbourField());
 
            forAll(pOwner, pFacei)
            {
                const label own = pOwner[pFacei];
 
                const vector& vvfOwn = vvf[own];
                const vector& vvfNei = psfNei[pFacei];
 
                const vector gradf((pCf[pFacei] - C[own]) & g[own]);
 
                const scalar vsfOwn = gradf & vvfOwn;
                const scalar vsfNei = gradf & vvfNei;
 
                scalar maxFace = max(vsfOwn, vsfNei);
                scalar minFace = min(vsfOwn, vsfNei);
                const scalar maxMinFace = rk*(maxFace - minFace);
                maxFace += maxMinFace;
                minFace -= maxMinFace;
 
                limitFace
                (
                    limiter[own],
                    maxFace - vsfOwn, minFace - vsfOwn,
                    magSqr(gradf)
                );
            }
        }
        else if (psf.fixesValue())
        {
            forAll(pOwner, pFacei)
            {
                const label own = pOwner[pFacei];
 
                const vector& vvfOwn = vvf[own];
                const vector& vvfNei = psf[pFacei];
 
                const vector gradf((pCf[pFacei] - C[own]) & g[own]);
 
                const scalar vsfOwn = gradf & vvfOwn;
                const scalar vsfNei = gradf & vvfNei;
 
                scalar maxFace = max(vsfOwn, vsfNei);
                scalar minFace = min(vsfOwn, vsfNei);
                const scalar maxMinFace = rk*(maxFace - minFace);
                maxFace += maxMinFace;
                minFace -= maxMinFace;
 
                limitFace
                (
                    limiter[own],
                    maxFace - vsfOwn, minFace - vsfOwn,
                    magSqr(gradf)
                );
            }
        }
    }
 
    if (fv::debug)
    {
        auto limits = gMinMax(limiter);
        auto avg = gAverage(limiter);
 
        Info<< "gradient limiter for: " << vvf.name()
            << " min = " << limits.min()
            << " max = " << limits.max()
            << " average: " << avg << endl;
    }
 
    g.primitiveFieldRef() *= limiter;
    g.correctBoundaryConditions();
    gaussGrad<vector>::correctBoundaryConditions(vvf, g);
 
    return tGrad;
}
 
 
// ************************************************************************* //