PatchToPatchInterpolate.C

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/*---------------------------------------------------------------------------*\
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     \\/     M anipulation  |
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    Copyright (C) 2020-2022 OpenCFD Ltd.
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License
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Description
    Patch to patch interpolation functions

\*---------------------------------------------------------------------------*/

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

namespace Foam
{

// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

template<class FromPatch, class ToPatch>
template<class Type>
tmp<Field<Type>>
PatchToPatchInterpolation<FromPatch, ToPatch>::pointInterpolate
(
    const Field<Type>& pf
) const
{
    if (pf.size() != fromPatch_.nPoints())
    {
        FatalErrorInFunction
            << "given field does not correspond to patch. Patch size: "
            << fromPatch_.nPoints() << " field size: " << pf.size()
            << abort(FatalError);
    }

    auto tresult = tmp<Field<Type>>::New(toPatch_.nPoints(), Zero);
    auto& result = tresult.ref();

    const auto& fromPatchLocalFaces = fromPatch_.localFaces();

    const FieldField<Field, scalar>& weights = pointWeights();

    const labelList& addr = pointAddr();

    forAll(result, pointi)
    {
        const scalarField& curWeights = weights[pointi];

        if (addr[pointi] > -1)
        {
            const labelList& hitFacePoints =
                fromPatchLocalFaces[addr[pointi]];

            forAll(curWeights, wI)
            {
                result[pointi] += curWeights[wI]*pf[hitFacePoints[wI]];
            }
        }
    }

    return tresult;
}


template<class FromPatch, class ToPatch>
template<class Type>
tmp<Field<Type>>
PatchToPatchInterpolation<FromPatch, ToPatch>::pointInterpolate
(
    const tmp<Field<Type>>& tpf
) const
{
    tmp<Field<Type>> tint = pointInterpolate<Type>(tpf());
    tpf.clear();
    return tint;
}


template<class FromPatch, class ToPatch>
template<class Type>
tmp<Field<Type>>
PatchToPatchInterpolation<FromPatch, ToPatch>::faceInterpolate
(
    const Field<Type>& ff
) const
{
    if (ff.size() != fromPatch_.size())
    {
        FatalErrorInFunction
            << "given field does not correspond to patch. Patch size: "
            << fromPatch_.size() << " field size: " << ff.size()
            << abort(FatalError);
    }

    auto tresult = tmp<Field<Type>>::New(toPatch_.size(), Zero);
    auto& result = tresult.ref();

    const labelListList& fromPatchFaceFaces = fromPatch_.faceFaces();

    const FieldField<Field, scalar>& weights = faceWeights();

    const labelList& addr = faceAddr();

    forAll(result, facei)
    {
        const scalarField& curWeights = weights[facei];

        if (addr[facei] > -1)
        {
            const labelList& hitFaceFaces =
                fromPatchFaceFaces[addr[facei]];

            // first add the hit face
            result[facei] += ff[addr[facei]]*curWeights[0];

            for (label wI = 1; wI < curWeights.size(); wI++)
            {
                result[facei] += ff[hitFaceFaces[wI - 1]]*curWeights[wI];
            }
        }
    }

    return tresult;
}


template<class FromPatch, class ToPatch>
template<class Type>
tmp<Field<Type>>
PatchToPatchInterpolation<FromPatch, ToPatch>::faceInterpolate
(
    const tmp<Field<Type>>& tff
) const
{
    tmp<Field<Type>> tint = faceInterpolate(tff());
    tff.clear();
    return tint;
}


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

} // End namespace Foam

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