fusedGaussConvectionScheme.C

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2011-2016 OpenFOAM Foundation
    Copyright (C) 2024 M. Janssens
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

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#include "fvcSurfaceOps.H"
#include "fusedGaussConvectionScheme.H"
#include "fvcSurfaceIntegrate.H"
#include "fvMatrices.H"

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

namespace Foam
{

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

namespace fv
{

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

template<class Type>
const surfaceInterpolationScheme<Type>&
fusedGaussConvectionScheme<Type>::interpScheme() const
{
    return tinterpScheme_();
}


template<class Type>
tmp<GeometricField<Type, fvsPatchField, surfaceMesh>>
fusedGaussConvectionScheme<Type>::interpolate
(
    const surfaceScalarField&,
    const GeometricField<Type, fvPatchField, volMesh>& vf
) const
{
    return tinterpScheme_().interpolate(vf);
}


template<class Type>
tmp<GeometricField<Type, fvsPatchField, surfaceMesh>>
fusedGaussConvectionScheme<Type>::flux
(
    const surfaceScalarField& faceFlux,
    const GeometricField<Type, fvPatchField, volMesh>& vf
) const
{
    return faceFlux*interpolate(faceFlux, vf);
}


template<class Type>
tmp<fvMatrix<Type>>
fusedGaussConvectionScheme<Type>::fvmDiv
(
    const surfaceScalarField& faceFlux,
    const GeometricField<Type, fvPatchField, volMesh>& vf
) const
{
    DebugPout<< "fusedGaussConvectionScheme<Type>::fvmDiv on " << vf.name()
        << " with flux " << faceFlux.name() << endl;

    tmp<surfaceScalarField> tweights = tinterpScheme_().weights(vf);
    const surfaceScalarField& weights = tweights();

    tmp<fvMatrix<Type>> tfvm
    (
        new fvMatrix<Type>
        (
            vf,
            faceFlux.dimensions()*vf.dimensions()
        )
    );
    fvMatrix<Type>& fvm = tfvm.ref();

    //fvm.lower() = -weights.primitiveField()*faceFlux.primitiveField();
    multiplySubtract
    (
        fvm.lower(),
        weights.primitiveField(),
        faceFlux.primitiveField()
    );

    //fvm.upper() = fvm.lower() + faceFlux.primitiveField();
    add(fvm.upper(), fvm.lower(), faceFlux.primitiveField());

    fvm.negSumDiag();

    forAll(vf.boundaryField(), patchi)
    {
        const fvPatchField<Type>& psf = vf.boundaryField()[patchi];
        const fvsPatchScalarField& patchFlux = faceFlux.boundaryField()[patchi];
        const fvsPatchScalarField& pw = weights.boundaryField()[patchi];

        auto& intCoeffs = fvm.internalCoeffs()[patchi];
        auto& bouCoeffs = fvm.boundaryCoeffs()[patchi];

        //fvm.internalCoeffs()[patchi] = patchFlux*psf.valueInternalCoeffs(pw);
        multiply(intCoeffs, patchFlux, psf.valueInternalCoeffs(pw)());

        //fvm.boundaryCoeffs()[patchi] = -patchFlux*psf.valueBoundaryCoeffs(pw);
        multiply(bouCoeffs, patchFlux, psf.valueBoundaryCoeffs(pw)());
        bouCoeffs.negate();
    }

    if (tinterpScheme_().corrected())
    {
        fvm += fvc::surfaceIntegrate(faceFlux*tinterpScheme_().correction(vf));
    }

    return tfvm;
}


template<class Type>
tmp<GeometricField<Type, fvPatchField, volMesh>>
fusedGaussConvectionScheme<Type>::fvcDiv
(
    const surfaceScalarField& faceFlux,
    const GeometricField<Type, fvPatchField, volMesh>& vf
) const
{
    DebugPout<< "fusedGaussConvectionScheme<Type>::fvcDiv on " << vf.name()
        << " with flux " << faceFlux.name() << endl;

    typedef GeometricField<Type, fvPatchField, volMesh> FieldType;

    const fvMesh& mesh = vf.mesh();

    tmp<FieldType> tConvection
    (
        new FieldType
        (
            IOobject
            (
                "convection(" + faceFlux.name() + ',' + vf.name() + ')',
                vf.instance(),
                mesh,
                IOobject::NO_READ,
                IOobject::NO_WRITE
            ),
            mesh,
            dimensioned<Type>
            (
                faceFlux.dimensions()
               *vf.dimensions()
               /dimVol,
                Zero
            ),
            fvPatchFieldBase::extrapolatedCalculatedType()
        )
    );

    if (this->tinterpScheme_().corrected())
    {
        const auto tfaceCorr(this->tinterpScheme_().correction(vf));
        auto& faceCorr = tfaceCorr();

        const auto interpolator = [&]
        (
            const vector& area,
            const scalar lambda,

            const Type& ownVal,
            const Type& neiVal,

            const scalar& faceVal,
            const Type& correction

        ) -> Type
        {
            return faceVal*((lambda*(ownVal - neiVal) + neiVal) + correction);
        };

        fvc::surfaceSum
        (
            // interpolation factors for volume field
            this->tinterpScheme_().weights(vf),

            // volume field(s)
            vf,

            // surface field(s)
            faceFlux,
            faceCorr,

            // operation
            interpolator,

            tConvection.ref(),
            false
        );
    }
    else
    {
        const auto interpolator = [&]
        (
            const vector& area,
            const scalar lambda,
            const Type& ownVal,
            const Type& neiVal,

            const scalar& faceVal
        ) -> Type
        {
            return faceVal*(lambda*(ownVal - neiVal) + neiVal);
        };

        fvc::surfaceSum
        (
            tinterpScheme_().weights(vf),

            vf,

            faceFlux,

            interpolator,
            tConvection.ref(),
            false
        );
    }

    tConvection.ref().primitiveFieldRef() /= mesh.Vsc();

    tConvection.ref().correctBoundaryConditions();

    return tConvection;
}


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

} // End namespace fv

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

} // End namespace Foam

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