gaussGrad.C

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    A nd           | Copyright (C) 1991-2010 OpenCFD Ltd.
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#include "gaussGrad.H"
#include <finiteVolume/zeroGradientFvPatchField.H>

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

namespace Foam
{

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

namespace fv
{

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

template<class Type>
tmp
<
    GeometricField
    <
        typename outerProduct<vector, Type>::type, fvPatchField, volMesh
    >
>
gaussGrad<Type>::grad
(
    const GeometricField<Type, fvsPatchField, surfaceMesh>& ssf
)
{
    typedef typename outerProduct<vector, Type>::type GradType;

    const fvMesh& mesh = ssf.mesh();

    tmp<GeometricField<GradType, fvPatchField, volMesh> > tgGrad
    (
        new GeometricField<GradType, fvPatchField, volMesh>
        (
            IOobject
            (
                "grad("+ssf.name()+')',
                ssf.instance(),
                mesh,
                IOobject::NO_READ,
                IOobject::NO_WRITE
            ),
            mesh,
            dimensioned<GradType>
            (
                "0",
                ssf.dimensions()/dimLength,
                pTraits<GradType>::zero
            ),
            zeroGradientFvPatchField<GradType>::typeName
        )
    );
    GeometricField<GradType, fvPatchField, volMesh>& gGrad = tgGrad();

    const unallocLabelList& owner = mesh.owner();
    const unallocLabelList& 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 unallocLabelList& pFaceCells =
            mesh.boundary()[patchi].faceCells();

        const vectorField& pSf = mesh.Sf().boundaryField()[patchi];

        const fvsPatchField<Type>& pssf = ssf.boundaryField()[patchi];

        forAll(mesh.boundary()[patchi], facei)
        {
            igGrad[pFaceCells[facei]] += pSf[facei]*pssf[facei];
        }
    }

    igGrad /= mesh.V();

    gGrad.correctBoundaryConditions();

    return tgGrad;
}


template<class Type>
tmp
<
    GeometricField
    <
        typename outerProduct<vector, Type>::type, fvPatchField, volMesh
    >
>
gaussGrad<Type>::grad
(
    const GeometricField<Type, fvPatchField, volMesh>& vsf
) const
{
    typedef typename outerProduct<vector, Type>::type GradType;

    tmp<GeometricField<GradType, fvPatchField, volMesh> > tgGrad
    (
        grad(tinterpScheme_().interpolate(vsf))
    );
    GeometricField<GradType, fvPatchField, volMesh>& gGrad = tgGrad();

    gGrad.rename("grad(" + vsf.name() + ')');
    correctBoundaryConditions(vsf, gGrad);

    return tgGrad;
}


template<class Type>
void gaussGrad<Type>::correctBoundaryConditions
(
    const GeometricField<Type, fvPatchField, volMesh>& vsf,
    GeometricField
    <
        typename outerProduct<vector, Type>::type, fvPatchField, volMesh
    >& gGrad
)
{
    forAll(vsf.boundaryField(), patchi)
    {
        if (!vsf.boundaryField()[patchi].coupled())
        {
            vectorField n =
                vsf.mesh().Sf().boundaryField()[patchi]
               /vsf.mesh().magSf().boundaryField()[patchi];

            gGrad.boundaryField()[patchi] += n *
            (
                vsf.boundaryField()[patchi].snGrad()
              - (n & gGrad.boundaryField()[patchi])
            );
        }
     }
}


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

} // End namespace fv

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

} // End namespace Foam

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