faceCorrectedSnGrad.C

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    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.
 
    You should have received a copy of the GNU General Public License
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#include "faceCorrectedSnGrad.H"
#include "volPointInterpolation.H"
#include "triangle.H"
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
template<class Type>
Foam::tmp<Foam::GeometricField<Type, Foam::fvsPatchField, Foam::surfaceMesh>>
Foam::fv::faceCorrectedSnGrad<Type>::fullGradCorrection
(
    const GeometricField<Type, fvPatchField, volMesh>& vf
) const
{
    const fvMesh& mesh = this->mesh();
 
    GeometricField<Type, pointPatchField, pointMesh> pvf
    (
        volPointInterpolation::New(mesh).interpolate(vf)
    );
 
    // construct GeometricField<Type, fvsPatchField, surfaceMesh>
    tmp<GeometricField<Type, fvsPatchField, surfaceMesh>> tsfCorr
    (
        new GeometricField<Type, fvsPatchField, surfaceMesh>
        (
            IOobject
            (
                "snGradCorr("+vf.name()+')',
                vf.instance(),
                mesh,
                IOobject::NO_READ,
                IOobject::NO_WRITE
            ),
            mesh,
            vf.dimensions()*mesh.nonOrthDeltaCoeffs().dimensions()
        )
    );
 
    Field<Type>& sfCorr = tsfCorr.ref().primitiveFieldRef();
 
    const pointField& points = mesh.points();
    const faceList& faces = mesh.faces();
    const vectorField& Sf = mesh.Sf();
    const vectorField& C = mesh.C();
    const scalarField& magSf = mesh.magSf();
    const auto& owner = mesh.owner();
    const auto& neighbour = mesh.neighbour();
 
    forAll(sfCorr, facei)
    {
        typename outerProduct<vector, Type>::type fgrad
        (
            outerProduct<vector, Type>::type::zero
        );
 
        const face& fi = faces[facei];
 
        const vector nf(Sf[facei]/magSf[facei]);
 
        for (label pi = 0; pi < fi.size(); ++pi)
        {
            // Next point index
            const label pj = fi.fcIndex(pi);
 
            // Edge normal in plane of face
            const vector edgen(nf^(points[fi[pj]] - points[fi[pi]]));
 
            // Edge centre field value
            const Type pvfe(0.5*(pvf[fi[pj]] + pvf[fi[pi]]));
 
            // Integrate face gradient
            fgrad += edgen*pvfe;
        }
 
        // Finalize face-gradient by dividing by face area
        fgrad /= magSf[facei];
 
        // Calculate correction vector
        vector dCorr(C[neighbour[facei]] - C[owner[facei]]);
        dCorr /= (nf & dCorr);
 
        sfCorr[facei] = dCorr&fgrad;
    }
 
    tsfCorr.ref().boundaryFieldRef() = Zero;
 
    return tsfCorr;
}
 
 
template<class Type>
Foam::tmp<Foam::GeometricField<Type, Foam::fvsPatchField, Foam::surfaceMesh>>
Foam::fv::faceCorrectedSnGrad<Type>::correction
(
    const GeometricField<Type, fvPatchField, volMesh>& vf
) const
{
    const fvMesh& mesh = this->mesh();
 
    // construct GeometricField<Type, fvsPatchField, surfaceMesh>
    tmp<GeometricField<Type, fvsPatchField, surfaceMesh>> tssf
    (
        new GeometricField<Type, fvsPatchField, surfaceMesh>
        (
            IOobject
            (
                "snGradCorr("+vf.name()+')',
                vf.instance(),
                mesh,
                IOobject::NO_READ,
                IOobject::NO_WRITE
            ),
            mesh,
            vf.dimensions()*mesh.nonOrthDeltaCoeffs().dimensions()
        )
    );
    GeometricField<Type, fvsPatchField, surfaceMesh>& ssf = tssf.ref();
 
    for (direction cmpt = 0; cmpt < pTraits<Type>::nComponents; ++cmpt)
    {
        ssf.replace
        (
            cmpt,
            faceCorrectedSnGrad<typename pTraits<Type>::cmptType>(mesh)
           .fullGradCorrection(vf.component(cmpt))
        );
    }
 
    return tssf;
}
 
 
// ************************************************************************* //