Phi.H

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License
    This file is part of OpenFOAM.

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Class
    Foam::PhiLimiter

Description
    Class with limiter function which returns the limiter for the
    Phi interpolation scheme.

    Used in conjunction with the template class PhiScheme.

SourceFiles
    Phi.C

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

#ifndef Phi_H
#define Phi_H

#include "vector.H"

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

namespace Foam
{

/*---------------------------------------------------------------------------*\
                         Class PhiLimiter Declaration
\*---------------------------------------------------------------------------*/

class PhiLimiter
{
    scalar k_;

public:

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

    scalar limiter
    (
        const scalar cdWeight,
        const scalar faceFlux,
        const vector& PhiP,
        const vector& PhiN,
        const vector& Sf,
        const scalar&
    ) const
    {
        scalar phiP = Sf&PhiP;
        scalar phiN = Sf&PhiN;

        scalar phiU;

        if (faceFlux > 0)
        {
            phiU = phiP;
        }
        else
        {
            phiU = phiN;
        }

        scalar phiCD = cdWeight*phiP + (1 - cdWeight)*phiN;

        // Calculate the effective limiter for the Phi interpolation
        // scalar PLimiter =
        //    (1.0 - k_) + k_*(faceFlux - phiU)/stabilise(phiCD - phiU, small);

        scalar PLimiter =
            ((faceFlux - phiU)/stabilise(phiCD - phiU, small) + k_);

        // Limit the limiter between upwind and central
        return max(min(PLimiter, 1), 0);
    }
};


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

} // End namespace Foam

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

#endif

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