iterativeGaussGrad.H

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2021 OpenCFD Ltd.
-------------------------------------------------------------------------------
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.
 
    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    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::iterativeGaussGrad
 
Description
    A second-order gradient scheme using face-interpolation,
    Gauss' theorem and iterative skew correction.
 
Usage
    Minimal example by using \c system/fvSchemes:
    \verbatim
    gradSchemes
    {
        grad(<term>)   iterativeGauss <interpolation scheme> <number of iters>;
    }
    \endverbatim
 
    and by using \c system/fvSolution:
    \verbatim
    relaxationFactors
    {
        fields
        {
            grad(<term>)    <relaxation factor>;
        }
    }
    \endverbatim
 
SourceFiles
    iterativeGaussGrad.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef iterativeGaussGrad_H
#define iterativeGaussGrad_H
 
#include "gaussGrad.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace fv
{
 
/*---------------------------------------------------------------------------*\
                       Class iterativeGaussGrad Declaration
\*---------------------------------------------------------------------------*/
 
template<class Type>
class iterativeGaussGrad
:
    public fv::gaussGrad<Type>
{
    // Private Data
 
        //- Number of skew-correction iterations
        label nIter_;
 
 
    // Private Member Functions
 
        //- No copy construct
        iterativeGaussGrad(const iterativeGaussGrad&) = delete;
 
        //- No copy assignment
        void operator=(const iterativeGaussGrad&) = delete;
 
 
public:
 
    //- Runtime type information
    TypeName("iterativeGauss");
 
 
    // Constructors
 
        //- Construct from mesh
        iterativeGaussGrad(const fvMesh& mesh)
        :
            gaussGrad<Type>(mesh),
            nIter_(1)
        {}
 
        //- Construct from mesh and Istream
        iterativeGaussGrad(const fvMesh& mesh, Istream& schemeData)
        :
            gaussGrad<Type>(mesh, schemeData),
            nIter_(readLabel(schemeData))
        {
            if (nIter_ <= 0)
            {
                FatalIOErrorInFunction(schemeData)
                    << "nIter = " << nIter_
                    << " should be > 0"
                    << exit(FatalIOError);
            }
        }
 
 
    // Member Functions
 
        //- 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;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace fv
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "iterativeGaussGrad.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //