Gamma.H

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License
    This file is part of OpenFOAM.

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Class
    Foam::GammaLimiter

Description
    Class with limiter function which returns the limiter for the
    Gamma interpolation scheme based on phict obtained from the LimiterFunc
    class.

    Used in conjunction with the template class LimitedScheme.

SourceFiles
    Gamma.C

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

#ifndef Gamma_H
#define Gamma_H

#include "vector.H"

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namespace Foam
{

/*---------------------------------------------------------------------------*\
                        Class GammaLimiter Declaration
\*---------------------------------------------------------------------------*/

template<class LimiterFunc>
class GammaLimiter
:
    public LimiterFunc
{
    scalar k_;

public:

    GammaLimiter(Istream& is)
    :
        k_(readScalar(is))
    {
        if (k_ < 0 || k_ > 1)
        {
            FatalIOErrorInFunction(is)
                << "coefficient = " << k_
                << " should be >= 0 and <= 1"
                << exit(FatalIOError);
        }

        // Rescale k_ to be >= 0 and <= 0.5 (TVD conformant)
        // and avoid the /0 when k_ = 0
        k_ = max(k_/2.0, small);
    }

    scalar limiter
    (
        const scalar cdWeight,
        const scalar faceFlux,
        const typename LimiterFunc::phiType& phiP,
        const typename LimiterFunc::phiType& phiN,
        const typename LimiterFunc::gradPhiType& gradcP,
        const typename LimiterFunc::gradPhiType& gradcN,
        const vector& d
    ) const
    {
        scalar phict = LimiterFunc::phict
        (
            faceFlux, phiP, phiN, gradcP, gradcN, d
        );

        return min(max(phict/k_, 0), 1);
    }
};


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

} // End namespace Foam

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

#endif

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