gaussGrad.C

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    This file is part of OpenFOAM.
 
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#include "gaussGrad.H"
#include "extrapolatedCalculatedFvPatchField.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
template<class Type>
Foam::tmp
<
    Foam::VolField<typename Foam::outerProduct<Foam::vector, Type>::type>
>
Foam::fv::gaussGrad<Type>::gradf
(
    const SurfaceField<Type>& ssf,
    const word& name
)
{
    typedef typename outerProduct<vector, Type>::type GradType;
 
    const fvMesh& mesh = ssf.mesh();
 
    tmp<VolField<GradType>> tgGrad
    (
        VolField<GradType>::New
        (
            name,
            mesh,
            dimensioned<GradType>
            (
                "0",
                ssf.dimensions()/dimLength,
                Zero
            ),
            extrapolatedCalculatedFvPatchField<GradType>::typeName
        )
    );
    VolField<GradType>& gGrad = tgGrad.ref();
 
    const labelUList& owner = mesh.owner();
    const labelUList& neighbour = mesh.neighbour();
    const vectorField& Sf = mesh.Sf();
 
    Field<GradType>& igGrad = gGrad;
    const Field<Type>& issf = ssf;
 
    forAll(owner, facei)
    {
        GradType Sfssf = Sf[facei]*issf[facei];
 
        igGrad[owner[facei]] += Sfssf;
        igGrad[neighbour[facei]] -= Sfssf;
    }
 
    forAll(mesh.boundary(), patchi)
    {
        const fvPatch& p = mesh.boundary()[patchi];
        const labelUList& pFaceCells = p.faceCells();
        const vectorField& pSf = mesh.Sf().boundaryField()[patchi];
        const fvsPatchField<Type>& pssf = ssf.boundaryField()[patchi];
 
        forAll(p, facei)
        {
            igGrad[pFaceCells[facei]] += pSf[facei]*pssf[facei];
        }
    }
 
    igGrad /= mesh.V();
 
    gGrad.correctBoundaryConditions();
 
    return tgGrad;
}
 
 
template<class Type>
Foam::tmp
<
    Foam::VolField<typename Foam::outerProduct<Foam::vector, Type>::type>
>
Foam::fv::gaussGrad<Type>::calcGrad
(
    const VolField<Type>& vsf,
    const word& name
) const
{
    typedef typename outerProduct<vector, Type>::type GradType;
 
    tmp<VolField<GradType>> tgGrad
    (
        gradf(tinterpScheme_().interpolate(vsf), name)
    );
    VolField<GradType>& gGrad = tgGrad.ref();
 
    correctBoundaryConditions(vsf, gGrad);
 
    return tgGrad;
}
 
 
template<class Type>
void Foam::fv::gaussGrad<Type>::correctBoundaryConditions
(
    const VolField<Type>& vsf,
    VolField<typename outerProduct<vector, Type>::type>& gGrad
)
{
    typename VolField<typename outerProduct<vector, Type>::type>::Boundary&
        gGradbf = gGrad.boundaryFieldRef();
 
    forAll(vsf.boundaryField(), patchi)
    {
        if (!vsf.boundaryField()[patchi].coupled())
        {
            const vectorField n
            (
                vsf.mesh().Sf().boundaryField()[patchi]
              / vsf.mesh().magSf().boundaryField()[patchi]
            );
 
            gGradbf[patchi] += n *
            (
                vsf.boundaryField()[patchi].snGrad()
              - (n & gGradbf[patchi])
            );
        }
     }
}
 
 
// ************************************************************************* //