faceLimitedGrad.H

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License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
Class
    Foam::fv::faceLimitedGrad
 
Description
    faceLimitedGrad gradient scheme applied to a runTime selected base gradient
    scheme.
 
    The scalar limiter based on limiting the extrapolated face values
    between the face-neighbour cell values and is applied to all components
    of the gradient.
 
SourceFiles
    faceLimitedGrad.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef faceLimitedGrad_H
#define faceLimitedGrad_H
 
#include "gradScheme.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace fv
{
 
/*---------------------------------------------------------------------------*\
                       Class faceLimitedGrad Declaration
\*---------------------------------------------------------------------------*/
 
template<class Type>
class faceLimitedGrad
:
    public fv::gradScheme<Type>
{
    // Private Data
 
        tmp<fv::gradScheme<Type>> basicGradScheme_;
 
        //- Limiter coefficient
        const scalar k_;
 
 
    // Private Member Functions
 
        inline void limitFace
        (
            scalar& limiter,
            const scalar maxDelta,
            const scalar minDelta,
            const scalar extrapolate
        ) const;
 
 
public:
 
    //- RunTime type information
    TypeName("faceLimited");
 
 
    // Constructors
 
        //- Construct from mesh and schemeData
        faceLimitedGrad(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
        faceLimitedGrad(const faceLimitedGrad&) = delete;
 
 
    // Member Functions
 
        //- Return the gradient of the given field to the gradScheme::grad
        //  for optional caching
        virtual tmp<VolField <typename outerProduct<vector, Type>::type>>
        calcGrad
        (
            const VolField<Type>& vsf,
            const word& name
        ) const
        {
            return grad(vsf);
        }
 
 
    // Member Operators
 
        //- Disallow default bitwise assignment
        void operator=(const faceLimitedGrad&) = delete;
};
 
 
// * * * * * * * * * * * * Inline Member Function  * * * * * * * * * * * * * //
 
template<class Type>
inline void faceLimitedGrad<Type>::limitFace
(
    scalar& limiter,
    const scalar maxDelta,
    const scalar minDelta,
    const scalar extrapolate
) const
{
    if (extrapolate > maxDelta + vSmall)
    {
        limiter = min(limiter, maxDelta/extrapolate);
    }
    else if (extrapolate < minDelta - vSmall)
    {
        limiter = min(limiter, minDelta/extrapolate);
    }
}
 
 
// * * * * * * * * Template Member Function Specialisations  * * * * * * * * //
 
template<>
tmp<volVectorField> faceLimitedGrad<scalar>::calcGrad
(
    const volScalarField& vsf,
    const word& name
) const;
 
 
template<>
tmp<volTensorField> faceLimitedGrad<vector>::calcGrad
(
    const volVectorField& vsf,
    const word& name
) const;
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace fv
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //