cellMDLimitedGrad.H

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Class
    Foam::fv::cellMDLimitedGrad

Description
    cellMDLimitedGrad gradient scheme applied to a runTime selected base
    gradient scheme.

    The scalar limiter based on limiting the extrapolated face values
    between the maximum and minimum cell and cell neighbour values and is
    applied to the gradient in each face direction separately.

SourceFiles
    cellMDLimitedGrad.C

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

#ifndef cellMDLimitedGrad_H
#define cellMDLimitedGrad_H

#include "gradScheme.H"

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

namespace Foam
{

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

namespace fv
{

/*---------------------------------------------------------------------------*\
                      Class cellMDLimitedGrad Declaration
\*---------------------------------------------------------------------------*/

template<class Type>
class cellMDLimitedGrad
:
    public fv::gradScheme<Type>
{
    // Private Data

        tmp<fv::gradScheme<Type>> basicGradScheme_;

        //- Limiter coefficient
        const scalar k_;


public:

    //- RunTime type information
    TypeName("cellMDLimited");


    // Constructors

        //- Construct from mesh and schemeData
        cellMDLimitedGrad(const fvMesh& mesh, Istream& schemeData)
        :
            gradScheme<Type>(mesh),
            basicGradScheme_(fv::gradScheme<Type>::New(mesh, schemeData)),
            k_(readScalar(schemeData))
        {
            if (k_ < 0 || k_ > 1)
            {
                FatalIOErrorInFunction
                (
                    schemeData
                )   << "coefficient = " << k_
                    << " should be >= 0 and <= 1"
                    << exit(FatalIOError);
            }
        }

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


    // Member Functions

        static inline void limitFace
        (
            typename outerProduct<vector, Type>::type& g,
            const Type& maxDelta,
            const Type& minDelta,
            const vector& dcf
        );

        //- Return the gradient of the given field to the gradScheme::grad
        //  for optional caching
        virtual tmp
        <
            GeometricField
            <typename outerProduct<vector, Type>::type, fvPatchField, volMesh>
        > calcGrad
        (
            const GeometricField<Type, fvPatchField, volMesh>& vsf,
            const word& name
        ) const;


    // Member Operators

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


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

template<>
inline void cellMDLimitedGrad<scalar>::limitFace
(
    vector& g,
    const scalar& maxDelta,
    const scalar& minDelta,
    const vector& dcf
)
{
    scalar extrapolate = dcf & g;

    if (extrapolate > maxDelta)
    {
        g = g + dcf*(maxDelta - extrapolate)/magSqr(dcf);
    }
    else if (extrapolate < minDelta)
    {
        g = g + dcf*(minDelta - extrapolate)/magSqr(dcf);
    }
}


template<class Type>
inline void cellMDLimitedGrad<Type>::limitFace
(
    typename outerProduct<vector, Type>::type& g,
    const Type& maxDelta,
    const Type& minDelta,
    const vector& dcf
)
{
    for (direction cmpt=0; cmpt<Type::nComponents; cmpt++)
    {
        vector gi(g[cmpt], g[cmpt+3], g[cmpt+6]);
        cellMDLimitedGrad<scalar>::limitFace
        (
            gi,
            maxDelta.component(cmpt),
            minDelta.component(cmpt),
            dcf
        );
        g[cmpt] = gi.x();
        g[cmpt+3] = gi.y();
        g[cmpt+6] = gi.z();
    }
}


// * * * * * * * * Template Member Function Specialisations  * * * * * * * * //

template<>
tmp<volVectorField> cellMDLimitedGrad<scalar>::calcGrad
(
    const volScalarField& vsf,
    const word& name
) const;


template<>
tmp<volTensorField> cellMDLimitedGrad<vector>::calcGrad
(
    const volVectorField& vsf,
    const word& name
) const;


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

} // End namespace fv

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

} // End namespace Foam

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

#endif

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