cellLimitedGrad.H

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/*---------------------------------------------------------------------------*\
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-------------------------------------------------------------------------------
    Copyright (C) 2011-2016 OpenFOAM Foundation
-------------------------------------------------------------------------------
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::cellLimitedGrad
 
Group
    grpFvGradSchemes
 
Description
    cellLimitedGrad 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 all components of the gradient.
 
SourceFiles
    cellLimitedGrad.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef cellLimitedGrad_H
#define cellLimitedGrad_H
 
#include "gradScheme.H"
#include "Field.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
namespace fv
{
 
/*---------------------------------------------------------------------------*\
                       Class cellLimitedGrad Declaration
\*---------------------------------------------------------------------------*/
 
template<class Type, class Limiter>
class cellLimitedGrad
:
    public fv::gradScheme<Type>,
    public Limiter
{
    // Private Data
 
        tmp<fv::gradScheme<Type>> basicGradScheme_;
 
        //- Limiter coefficient
        const scalar k_;
 
 
    // Private Member Functions
 
        void limitGradient
        (
            const Field<scalar>& limiter,
            Field<vector>& gIf
        ) const;
 
        void limitGradient
        (
            const Field<vector>& limiter,
            Field<tensor>& gIf
        ) const;
 
        //- No copy construct
        cellLimitedGrad(const cellLimitedGrad&) = delete;
 
        //- No copy assignment
        void operator=(const cellLimitedGrad&) = delete;
 
 
public:
 
    //- RunTime type information
    TypeName("cellLimited");
 
 
    // Constructors
 
        //- Construct from mesh and schemeData
        cellLimitedGrad(const fvMesh& mesh, Istream& schemeData)
        :
            gradScheme<Type>(mesh),
            Limiter(schemeData),
            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);
            }
        }
 
 
    // Member Functions
 
        inline void limitFaceCmpt
        (
            scalar& limiter,
            const scalar maxDelta,
            const scalar minDelta,
            const scalar extrapolate
        ) const;
 
        inline void limitFace
        (
            Type& limiter,
            const Type& maxDelta,
            const Type& minDelta,
            const Type& extrapolate
        ) const;
 
        //- 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;
 
        //- Calculate the grad of the given field into supplied field
        virtual void calcGrad
        (
            GeometricField
            <typename outerProduct<vector, Type>::type, fvPatchField, volMesh>& res,
            const GeometricField<Type, fvPatchField, volMesh>&
        ) const;
};
 
 
// * * * * * * * * * * * * Inline Member Function  * * * * * * * * * * * * * //
 
template<class Type, class Limiter>
inline void cellLimitedGrad<Type, Limiter>::limitFaceCmpt
(
    scalar& limiter,
    const scalar maxDelta,
    const scalar minDelta,
    const scalar extrapolate
) const
{
    scalar r = 1;
 
    if (extrapolate > SMALL)
    {
        r = maxDelta/extrapolate;
    }
    else if (extrapolate < -SMALL)
    {
        r = minDelta/extrapolate;
    }
    else
    {
        return;
    }
 
    limiter = min(limiter, Limiter::limiter(r));
}
 
 
template<class Type, class Limiter>
inline void cellLimitedGrad<Type, Limiter>::limitFace
(
    Type& limiter,
    const Type& maxDelta,
    const Type& minDelta,
    const Type& extrapolate
) const
{
    for (direction cmpt=0; cmpt<pTraits<Type>::nComponents; ++cmpt)
    {
        limitFaceCmpt
        (
            setComponent(limiter, cmpt),
            component(maxDelta, cmpt),
            component(minDelta, cmpt),
            component(extrapolate, cmpt)
        );
    }
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace fv
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "cellLimitedGrad.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //