backwardDdtScheme.H

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2011-2017 OpenFOAM Foundation
    Copyright (C) 2017 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::backwardDdtScheme
 
Group
    grpFvDdtSchemes
 
Description
    Second-order backward-differencing ddt using the current and
    two previous time-step values.
 
SourceFiles
    backwardDdtScheme.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef backwardDdtScheme_H
#define backwardDdtScheme_H
 
#include "ddtScheme.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace fv
{
 
/*---------------------------------------------------------------------------*\
                       Class backwardDdtScheme Declaration
\*---------------------------------------------------------------------------*/
 
template<class Type>
class backwardDdtScheme
:
    public fv::ddtScheme<Type>
{
    // 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&) const;
 
        //- No copy construct
        backwardDdtScheme(const backwardDdtScheme&) = delete;
 
        //- No copy assignment
        void operator=(const backwardDdtScheme&) = delete;
 
 
public:
 
    //- Runtime type information
    TypeName("backward");
 
 
    // Constructors
 
        //- Construct from mesh
        backwardDdtScheme(const fvMesh& mesh)
        :
            ddtScheme<Type>(mesh)
        {}
 
        //- Construct from mesh and Istream
        backwardDdtScheme(const fvMesh& mesh, Istream& is)
        :
            ddtScheme<Type>(mesh, is)
        {
            if (is.good() && !is.eof())
            {
                is >> this->ddtPhiCoeff_;
            }
 
            // Ensure the old-old-time cell volumes are available
            // for moving meshes
            if (mesh.moving())
            {
                mesh.V00();
            }
        }
 
 
    // Member Functions
 
        //- Return mesh reference
        const fvMesh& mesh() const
        {
            return fv::ddtScheme<Type>::mesh();
        }
 
        tmp<GeometricField<Type, fvPatchField, volMesh>> fvcDdt
        (
            const dimensioned<Type>&
        );
 
        tmp<GeometricField<Type, fvPatchField, volMesh>> fvcDdt
        (
            const GeometricField<Type, fvPatchField, volMesh>&
        );
 
        tmp<GeometricField<Type, fvPatchField, volMesh>> fvcDdt
        (
            const dimensionedScalar&,
            const GeometricField<Type, fvPatchField, volMesh>&
        );
 
        tmp<GeometricField<Type, fvPatchField, volMesh>> fvcDdt
        (
            const volScalarField&,
            const GeometricField<Type, fvPatchField, volMesh>&
        );
 
        tmp<GeometricField<Type, fvPatchField, volMesh>> fvcDdt
        (
            const volScalarField& alpha,
            const volScalarField& rho,
            const GeometricField<Type, fvPatchField, volMesh>& psi
        );
 
        tmp<fvMatrix<Type>> fvmDdt
        (
            const GeometricField<Type, fvPatchField, volMesh>&
        );
 
        tmp<fvMatrix<Type>> fvmDdt
        (
            const dimensionedScalar&,
            const GeometricField<Type, fvPatchField, volMesh>&
        );
 
        tmp<fvMatrix<Type>> fvmDdt
        (
            const volScalarField&,
            const GeometricField<Type, fvPatchField, volMesh>&
        );
 
        tmp<fvMatrix<Type>> fvmDdt
        (
            const volScalarField& alpha,
            const volScalarField& rho,
            const GeometricField<Type, fvPatchField, volMesh>& psi
        );
 
        typedef typename ddtScheme<Type>::fluxFieldType fluxFieldType;
 
        tmp<fluxFieldType> fvcDdtUfCorr
        (
            const GeometricField<Type, fvPatchField, volMesh>& U,
            const GeometricField<Type, fvsPatchField, surfaceMesh>& Uf
        );
 
        tmp<fluxFieldType> fvcDdtPhiCorr
        (
            const GeometricField<Type, fvPatchField, volMesh>& U,
            const fluxFieldType& phi
        );
 
        tmp<fluxFieldType> fvcDdtUfCorr
        (
            const volScalarField& rho,
            const GeometricField<Type, fvPatchField, volMesh>& U,
            const GeometricField<Type, fvsPatchField, surfaceMesh>& Uf
        );
 
        tmp<fluxFieldType> fvcDdtPhiCorr
        (
            const volScalarField& rho,
            const GeometricField<Type, fvPatchField, volMesh>& U,
            const fluxFieldType& phi
        );
 
        tmp<surfaceScalarField> meshPhi
        (
            const GeometricField<Type, fvPatchField, volMesh>&
        );
};
 
 
template<>
tmp<surfaceScalarField> backwardDdtScheme<scalar>::fvcDdtUfCorr
(
    const GeometricField<scalar, fvPatchField, volMesh>& U,
    const GeometricField<scalar, fvsPatchField, surfaceMesh>& Uf
);
 
template<>
tmp<surfaceScalarField> backwardDdtScheme<scalar>::fvcDdtPhiCorr
(
    const volScalarField& U,
    const surfaceScalarField& phi
);
 
template<>
tmp<surfaceScalarField> backwardDdtScheme<scalar>::fvcDdtUfCorr
(
    const volScalarField& rho,
    const volScalarField& U,
    const surfaceScalarField& Uf
);
 
template<>
tmp<surfaceScalarField> backwardDdtScheme<scalar>::fvcDdtPhiCorr
(
    const volScalarField& rho,
    const volScalarField& U,
    const surfaceScalarField& phi
);
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace fv
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "backwardDdtScheme.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //