gaussFaGrad.C

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2016-2017 Wikki Ltd
    Copyright (C) 2023 OpenCFD Ltd.
-------------------------------------------------------------------------------
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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    You should have received a copy of the GNU General Public License
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\*---------------------------------------------------------------------------*/

#include "gaussFaGrad.H"
#include "facGrad.H"

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

namespace Foam
{

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

namespace fa
{

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

template<class Type>
tmp
<
    GeometricField
    <
        typename outerProduct<vector, Type>::type,
        faPatchField,
        areaMesh
    >
>
gaussGrad<Type>::gradf
(
    const GeometricField<Type, faePatchField, edgeMesh>& ssf,
    const word& name
)
{
    const areaVectorField &n = ssf.mesh().faceAreaNormals();
    typedef typename outerProduct<vector,Type>::type GradType;

    tmp<GeometricField<GradType, faPatchField, areaMesh>> tgGrad =
        fac::edgeIntegrate(ssf.mesh().Sf()*ssf);

    GeometricField<GradType, faPatchField, areaMesh>& gGrad = tgGrad.ref();

    gGrad -= n*(n & gGrad);
    gGrad.correctBoundaryConditions();

    return tgGrad;
}


template<class Type>
tmp
<
    GeometricField
    <
        typename outerProduct<vector, Type>::type,
        faPatchField,
        areaMesh
    >
>
gaussGrad<Type>::calcGrad
(
    const GeometricField<Type, faPatchField, areaMesh>& vsf,
    const word& name
) const
{
    typedef typename outerProduct<vector, Type>::type GradType;
    typedef GeometricField<GradType, faPatchField, areaMesh> GradFieldType;

    tmp<GradFieldType> tgGrad
    (
        fac::edgeIntegrate
        (
            vsf.mesh().Le()
           *tinterpScheme_().interpolate(vsf)
        )
    );
    GradFieldType& gGrad = tgGrad.ref();

    gGrad.correctBoundaryConditions();
    gGrad.rename(name);

    correctBoundaryConditions(vsf, gGrad);

    return tgGrad;
}


template<class Type>
void gaussGrad<Type>::correctBoundaryConditions
(
    const GeometricField<Type, faPatchField, areaMesh>& vsf,
    GeometricField
    <
        typename outerProduct<vector, Type>::type, faPatchField, areaMesh
    >& gGrad
)
{
    forAll(vsf.boundaryField(), patchI)
    {
        if (!vsf.boundaryField()[patchI].coupled())
        {
            const vectorField m
            (
                vsf.mesh().Le().boundaryField()[patchI]/
                vsf.mesh().magLe().boundaryField()[patchI]
            );

            gGrad.boundaryFieldRef()[patchI] += m*
            (
                vsf.boundaryField()[patchI].snGrad()
              - (m & gGrad.boundaryField()[patchI])
            );
        }
    }
}


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

} // End namespace fa

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

} // End namespace Foam

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