limitedLinear.H

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Class
    Foam::limitedLinearLimiter

Description
    Class with limiter function which returns the limiter for the
    TVD limited linear differencing scheme based on r obtained from the
    LimiterFunc class.

    Used in conjunction with the template class LimitedScheme.

SourceFiles
    limitedLinear.C

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

#ifndef limitedLinear_H
#define limitedLinear_H

#include "vector.H"

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

namespace Foam
{

/*---------------------------------------------------------------------------*\
                    Class limitedLinearLimiter Declaration
\*---------------------------------------------------------------------------*/

template<class LimiterFunc>
class limitedLinearLimiter
:
    public LimiterFunc
{
    scalar k_;
    scalar twoByk_;

public:

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

        // Avoid the /0 when k_ = 0
        twoByk_ = 2.0/max(k_, 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 r = LimiterFunc::r
        (
            faceFlux, phiP, phiN, gradcP, gradcN, d
        );

        return max(min(twoByk_*r, 1), 0);
    }
};


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

} // End namespace Foam

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

#endif

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