boundedBackwardFaDdtScheme.H

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/*---------------------------------------------------------------------------*\
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-------------------------------------------------------------------------------
    Copyright (C) 2016-2017 Wikki 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
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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::boundedBackwardFaDdtScheme
 
Description
    Second-order backward-differencing implicit ddt using the current and
    two previous time-step values.
 
SourceFiles
    boundedBackwardFaDdtScheme.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef boundedBackwardFaDdtScheme_H
#define boundedBackwardFaDdtScheme_H
 
#include "faDdtScheme.H"
#include "faMatrices.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace fa
{
 
/*---------------------------------------------------------------------------*\
                       Class boundedBackwardFaDdtScheme Declaration
\*---------------------------------------------------------------------------*/
 
class boundedBackwardFaDdtScheme
:
    public fa::faDdtScheme<scalar>
{
    // Private Member Functions
 
        //- Return the current time-step
        scalar deltaT_() const;
 
        //- Return the previous time-step
        scalar deltaT0_() const;
 
        //- Return the previous time-step or GREAT if the old timestep field
        //  wasn't available in which case Euler ddt is used
        template<class GeoField>
        scalar deltaT0_(const GeoField& vf) const
        {
            if (vf.oldTime().timeIndex() == vf.oldTime().oldTime().timeIndex())
            {
                return GREAT;
            }
            else
            {
                return deltaT0_();
            }
        }
 
 
        //- No copy construct
        boundedBackwardFaDdtScheme(const boundedBackwardFaDdtScheme&) = delete;
 
        //- No copy assignment
        void operator=(const boundedBackwardFaDdtScheme&) = delete;
 
 
public:
 
    //- Runtime type information
    TypeName("boundedBackward");
 
 
    // Constructors
 
        //- Construct from mesh
        boundedBackwardFaDdtScheme(const faMesh& mesh)
        :
            faDdtScheme<scalar>(mesh)
        {}
 
        //- Construct from mesh and Istream
        boundedBackwardFaDdtScheme(const faMesh& mesh, Istream& is)
        :
            faDdtScheme<scalar>(mesh, is)
        {}
 
 
    // Member Functions
 
        //- Return mesh reference
        const faMesh& mesh() const
        {
            return fa::faDdtScheme<scalar>::mesh();
        }
 
        tmp<areaScalarField> facDdt
        (
            const dimensionedScalar
        );
 
        tmp<areaScalarField> facDdt0
        (
            const dimensionedScalar
        );
 
        tmp<areaScalarField> facDdt
        (
            const areaScalarField&
        );
 
        tmp<areaScalarField> facDdt0
        (
            const areaScalarField&
        );
 
        tmp<areaScalarField> facDdt
        (
            const dimensionedScalar&,
            const areaScalarField&
        );
 
        tmp<areaScalarField> facDdt0
        (
            const dimensionedScalar&,
            const areaScalarField&
        );
 
        tmp<areaScalarField> facDdt
        (
            const areaScalarField&,
            const areaScalarField&
        );
 
        tmp<areaScalarField> facDdt0
        (
            const areaScalarField&,
            const areaScalarField&
        );
 
        tmp<faScalarMatrix> famDdt
        (
            const areaScalarField&
        );
 
        tmp<faScalarMatrix> famDdt
        (
            const dimensionedScalar&,
            const areaScalarField&
        );
 
        tmp<faScalarMatrix> famDdt
        (
            const areaScalarField&,
            const areaScalarField&
        );
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace fa
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //