UpwindFitScheme.H

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/*---------------------------------------------------------------------------*\
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-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM is free software: you can redistribute it and/or modify it
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    the Free Software Foundation, either version 3 of the License, or
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Class
    Foam::UpwindFitScheme

Description
    Upwind biased fit surface interpolation scheme that applies an explicit
    correction to linear.

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

#ifndef UpwindFitScheme_H
#define UpwindFitScheme_H

#include "UpwindFitData.H"
#include <finiteVolume/linear.H>

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

namespace Foam
{

/*---------------------------------------------------------------------------*\
                           Class UpwindFitScheme Declaration
\*---------------------------------------------------------------------------*/

template<class Type, class Polynomial, class Stencil>
class UpwindFitScheme
:
    public linear<Type>
{
    // Private Data

        //- Reference to the surface flux used to choose upwind direction
        const surfaceScalarField& faceFlux_;

        //- Factor the fit is allowed to deviate from linear.
        //  This limits the amount of high-order correction and increases
        //  stability on bad meshes
        const scalar linearLimitFactor_;

        //- Weights for central stencil
        const scalar centralWeight_;


    // Private Member Functions

        //- Disallow default bitwise copy construct
        UpwindFitScheme(const UpwindFitScheme&);

        //- Disallow default bitwise assignment
        void operator=(const UpwindFitScheme&);


public:

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


    // Constructors

        //- Construct from mesh and Istream
        //  The name of the flux field is read from the Istream and looked-up
        //  from the mesh objectRegistry
        UpwindFitScheme(const fvMesh& mesh, Istream& is)
        :
            linear<Type>(mesh),
            faceFlux_(mesh.lookupObject<surfaceScalarField>(word(is))),
            linearLimitFactor_(readScalar(is)),
            centralWeight_(1000)
        {}


        //- Construct from mesh, faceFlux and Istream
        UpwindFitScheme
        (
            const fvMesh& mesh,
            const surfaceScalarField& faceFlux,
            Istream& is
        )
        :
            linear<Type>(mesh),
            faceFlux_(faceFlux),
            linearLimitFactor_(readScalar(is)),
            centralWeight_(1000)
        {}


    // Member Functions

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

        //- Return the explicit correction to the face-interpolate
        virtual tmp<GeometricField<Type, fvsPatchField, surfaceMesh> >
        correction
        (
            const GeometricField<Type, fvPatchField, volMesh>& vf
        ) const
        {
            const fvMesh& mesh = this->mesh();

            const extendedUpwindCellToFaceStencil& stencil = Stencil::New
            (
                mesh,
                false,          //pureUpwind
                scalar(0.5)
            );

            const UpwindFitData<Polynomial>& ufd =
            UpwindFitData<Polynomial>::New
            (
                mesh,
                stencil,
                true,           //calculate as offset to linear
                linearLimitFactor_,
                centralWeight_
            );

            const List<scalarList>& fo = ufd.owncoeffs();
            const List<scalarList>& fn = ufd.neicoeffs();

            return stencil.weightedSum(faceFlux_, vf, fo, fn);
        }
};


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

} // End namespace Foam

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

// Add the patch constructor functions to the hash tables

#define makeUpwindFitSurfaceInterpolationTypeScheme(SS, POLYNOMIAL, STENCIL, TYPE) \
                                                                              \
typedef UpwindFitScheme<TYPE, POLYNOMIAL, STENCIL>                            \
    UpwindFitScheme##TYPE##POLYNOMIAL##STENCIL##_;                            \
defineTemplateTypeNameAndDebugWithName                                        \
    (UpwindFitScheme##TYPE##POLYNOMIAL##STENCIL##_, #SS, 0);                  \
                                                                              \
surfaceInterpolationScheme<TYPE>::addMeshConstructorToTable                   \
<UpwindFitScheme<TYPE, POLYNOMIAL, STENCIL> >                                 \
    add##SS##STENCIL##TYPE##MeshConstructorToTable_;                          \
                                                                              \
surfaceInterpolationScheme<TYPE>::addMeshFluxConstructorToTable               \
<UpwindFitScheme<TYPE, POLYNOMIAL, STENCIL> >                                 \
    add##SS##STENCIL##TYPE##MeshFluxConstructorToTable_;

#define makeUpwindFitSurfaceInterpolationScheme(SS, POLYNOMIAL, STENCIL)      \
                                                                              \
makeUpwindFitSurfaceInterpolationTypeScheme(SS,POLYNOMIAL,STENCIL,scalar)     \
makeUpwindFitSurfaceInterpolationTypeScheme(SS,POLYNOMIAL,STENCIL,vector)     \
makeUpwindFitSurfaceInterpolationTypeScheme(SS,POLYNOMIAL,STENCIL,sphericalTensor) \
makeUpwindFitSurfaceInterpolationTypeScheme(SS,POLYNOMIAL,STENCIL,symmTensor) \
makeUpwindFitSurfaceInterpolationTypeScheme(SS,POLYNOMIAL,STENCIL,tensor)


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

#endif

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