outletStabilised.H

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Class
    Foam::outletStabilised

Description
    Outlet-stabilised interpolation scheme which applies upwind differencing
    to the faces of the cells adjacent to outlets.

    This is particularly useful to stabilise the velocity at entrainment
    boundaries for LES cases using linear or other centred differencing
    schemes.

SourceFiles
    outletStabilised.C

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

#ifndef outletStabilised_H
#define outletStabilised_H

#include "surfaceInterpolationScheme.H"
#include "skewCorrectionVectors.H"
#include "linear.H"
#include "gaussGrad.H"
#include "zeroGradientFvPatchField.H"
#include "mixedFvPatchField.H"
#include "directionMixedFvPatchField.H"

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

namespace Foam
{

/*---------------------------------------------------------------------------*\
                      Class outletStabilised Declaration
\*---------------------------------------------------------------------------*/

template<class Type>
class outletStabilised
:
    public surfaceInterpolationScheme<Type>
{
    // Private member data

        const surfaceScalarField& faceFlux_;
        tmp<surfaceInterpolationScheme<Type>> tScheme_;


public:

    //- Runtime type information
    TypeName("outletStabilised");


    // Constructors

        //- Construct from mesh and Istream
        outletStabilised
        (
            const fvMesh& mesh,
            Istream& is
        )
        :
            surfaceInterpolationScheme<Type>(mesh),
            faceFlux_
            (
                mesh.lookupObject<surfaceScalarField>
                (
                    word(is)
                )
            ),
            tScheme_
            (
                surfaceInterpolationScheme<Type>::New(mesh, faceFlux_, is)
            )
        {}


        //- Construct from mesh, faceFlux and Istream
        outletStabilised
        (
            const fvMesh& mesh,
            const surfaceScalarField& faceFlux,
            Istream& is
        )
        :
            surfaceInterpolationScheme<Type>(mesh),
            faceFlux_(faceFlux),
            tScheme_
            (
                surfaceInterpolationScheme<Type>::New(mesh, faceFlux, is)
            )
        {}

        //- Disallow default bitwise copy construction
        outletStabilised(const outletStabilised&) = delete;


    // Member Functions

        //- Return the interpolation weighting factors
        tmp<surfaceScalarField> weights
        (
            const GeometricField<Type, fvPatchField, volMesh>& vf
        ) const
        {
            tmp<surfaceScalarField> tw = tScheme_().weights(vf);
            surfaceScalarField& w = tw.ref();

            const fvMesh& mesh_ = this->mesh();
            const cellList& cells = mesh_.cells();

            forAll(vf.boundaryField(), patchi)
            {
                if
                (
                    isA<zeroGradientFvPatchField<Type>>
                        (vf.boundaryField()[patchi])
                 || isA<mixedFvPatchField<Type>>(vf.boundaryField()[patchi])
                 || isA<directionMixedFvPatchField<Type>>
                    (vf.boundaryField()[patchi])
                )
                {
                    const labelList& pFaceCells =
                        mesh_.boundary()[patchi].faceCells();

                    forAll(pFaceCells, pFacei)
                    {
                        const cell& pFaceCell = cells[pFaceCells[pFacei]];

                        forAll(pFaceCell, fi)
                        {
                            label facei = pFaceCell[fi];

                            if (mesh_.isInternalFace(facei))
                            {
                                // Apply upwind differencing
                                w[facei] = pos0(faceFlux_[facei]);
                            }
                        }
                    }
                }
            }

            return tw;
        }

        //- Return true if this scheme uses an explicit correction
        virtual bool corrected() const
        {
            return tScheme_().corrected();
        }

        //- Return the explicit correction to the face-interpolate
        //  set to zero on the near-boundary faces where upwind is applied
        virtual tmp<GeometricField<Type, fvsPatchField, surfaceMesh>>
        correction
        (
            const GeometricField<Type, fvPatchField, volMesh>& vf
        ) const
        {
            if (tScheme_().corrected())
            {
                tmp<GeometricField<Type, fvsPatchField, surfaceMesh>> tcorr =
                    tScheme_().correction(vf);

                GeometricField<Type, fvsPatchField, surfaceMesh>& corr =
                    tcorr.ref();

                const fvMesh& mesh_ = this->mesh();
                const cellList& cells = mesh_.cells();

                forAll(vf.boundaryField(), patchi)
                {
                    if
                    (
                        isA<zeroGradientFvPatchField<Type>>
                            (vf.boundaryField()[patchi])
                     || isA<mixedFvPatchField<Type>>
                            (vf.boundaryField()[patchi])
                    )
                    {
                        const labelList& pFaceCells =
                            mesh_.boundary()[patchi].faceCells();

                        forAll(pFaceCells, pFacei)
                        {
                            const cell& pFaceCell = cells[pFaceCells[pFacei]];

                            forAll(pFaceCell, fi)
                            {
                                label facei = pFaceCell[fi];

                                if (mesh_.isInternalFace(facei))
                                {
                                    // Remove correction
                                    corr[facei] = Zero;
                                }
                            }
                        }
                    }
                }

                return tcorr;
            }
            else
            {
                return tmp<GeometricField<Type, fvsPatchField, surfaceMesh>>
                (
                    nullptr
                );
            }
        }


    // Member Operators

        //- Disallow default bitwise assignment
        void operator=(const outletStabilised&) = delete;
};


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

} // End namespace Foam

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

#endif

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