SLTSDdtScheme.H

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License
    This file is part of OpenFOAM.

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    the Free Software Foundation, either version 3 of the License, or
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Class
    Foam::fv::SLTSDdtScheme

Description
    Stabilised local time-step first-order Euler implicit/explicit ddt.
    The time-step is adjusted locally so that an advective equations remains
    diagonally dominant.

    This scheme should only be used for steady-state computations
    using transient codes where local time-stepping is preferably to
    under-relaxation for transport consistency reasons.

See also
    Foam::fv::CoEulerDdtScheme

SourceFiles
    SLTSDdtScheme.C

\*---------------------------------------------------------------------------*/

#ifndef SLTSDdtScheme_H
#define SLTSDdtScheme_H

#include "ddtScheme.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace fv
{

/*---------------------------------------------------------------------------*\
                       Class SLTSDdtScheme Declaration
\*---------------------------------------------------------------------------*/

template<class Type>
class SLTSDdtScheme
:
    public fv::ddtScheme<Type>
{
    // Private Data

        //- Name of the flux field used to calculate the local time-step
        word phiName_;

        //- Name of the density field used to obtain the volumetric flux
        //  from the mass flux if required
        word rhoName_;

        //- Under-relaxation factor
        scalar alpha_;


    // Private Member Functions

        //- Calculate a relaxed diagonal from the given flux field
        void relaxedDiag(scalarField& rD, const surfaceScalarField& phi) const;

        //- Return the reciprocal of the stabilised local time-step
        tmp<volScalarField> SLrDeltaT() const;


public:

    //- Runtime type information
    TypeName("SLTS");


    // Constructors

        //- Construct from mesh and Istream
        SLTSDdtScheme(const fvMesh& mesh, Istream& is)
        :
            ddtScheme<Type>(mesh, is),
            phiName_(is),
            rhoName_(is),
            alpha_(readScalar(is))
        {}

        //- Disallow default bitwise copy construction
        SLTSDdtScheme(const SLTSDdtScheme&) = delete;


    // Member Functions

        //- Return mesh reference
        const fvMesh& mesh() const
        {
            return fv::ddtScheme<Type>::mesh();
        }

        virtual tmp<GeometricField<Type, fvPatchField, volMesh>> fvcDdt
        (
            const dimensioned<Type>&
        );

        virtual tmp<GeometricField<Type, fvPatchField, volMesh>> fvcDdt
        (
            const GeometricField<Type, fvPatchField, volMesh>&
        );

        virtual tmp<GeometricField<Type, fvPatchField, volMesh>> fvcDdt
        (
            const dimensionedScalar&,
            const GeometricField<Type, fvPatchField, volMesh>&
        );

        virtual tmp<GeometricField<Type, fvPatchField, volMesh>> fvcDdt
        (
            const volScalarField&,
            const GeometricField<Type, fvPatchField, volMesh>&
        );

        virtual tmp<GeometricField<Type, fvPatchField, volMesh>> fvcDdt
        (
            const volScalarField& alpha,
            const volScalarField& rho,
            const GeometricField<Type, fvPatchField, volMesh>& psi
        );

        virtual tmp<fvMatrix<Type>> fvmDdt
        (
            const GeometricField<Type, fvPatchField, volMesh>&
        );

        virtual tmp<fvMatrix<Type>> fvmDdt
        (
            const dimensionedScalar&,
            const GeometricField<Type, fvPatchField, volMesh>&
        );

        virtual tmp<fvMatrix<Type>> fvmDdt
        (
            const volScalarField&,
            const GeometricField<Type, fvPatchField, volMesh>&
        );

        virtual tmp<fvMatrix<Type>> fvmDdt
        (
            const volScalarField& alpha,
            const volScalarField& rho,
            const GeometricField<Type, fvPatchField, volMesh>& psi
        );

        typedef typename ddtScheme<Type>::fluxFieldType fluxFieldType;

        virtual tmp<fluxFieldType> fvcDdtUfCorr
        (
            const GeometricField<Type, fvPatchField, volMesh>& U,
            const GeometricField<Type, fvsPatchField, surfaceMesh>& Uf
        );

        virtual tmp<fluxFieldType> fvcDdtPhiCorr
        (
            const GeometricField<Type, fvPatchField, volMesh>& U,
            const fluxFieldType& phi
        );

        virtual tmp<fluxFieldType> fvcDdtUfCorr
        (
            const volScalarField& rho,
            const GeometricField<Type, fvPatchField, volMesh>& U,
            const GeometricField<Type, fvsPatchField, surfaceMesh>& Uf
        );

        virtual tmp<fluxFieldType> fvcDdtPhiCorr
        (
            const volScalarField& rho,
            const GeometricField<Type, fvPatchField, volMesh>& U,
            const fluxFieldType& phi
        );

        virtual tmp<surfaceScalarField> meshPhi
        (
            const GeometricField<Type, fvPatchField, volMesh>&
        );


    // Member Operators

        //- Disallow default bitwise assignment
        void operator=(const SLTSDdtScheme&) = delete;
};


template<>
tmp<surfaceScalarField> SLTSDdtScheme<scalar>::fvcDdtUfCorr
(
    const GeometricField<scalar, fvPatchField, volMesh>& U,
    const GeometricField<scalar, fvsPatchField, surfaceMesh>& Uf
);

template<>
tmp<surfaceScalarField> SLTSDdtScheme<scalar>::fvcDdtPhiCorr
(
    const volScalarField& U,
    const surfaceScalarField& phi
);

template<>
tmp<surfaceScalarField> SLTSDdtScheme<scalar>::fvcDdtUfCorr
(
    const volScalarField& rho,
    const volScalarField& U,
    const surfaceScalarField& Uf
);

template<>
tmp<surfaceScalarField> SLTSDdtScheme<scalar>::fvcDdtPhiCorr
(
    const volScalarField& rho,
    const volScalarField& U,
    const surfaceScalarField& phi
);


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace fv

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#ifdef NoRepository
    #include "SLTSDdtScheme.C"
#endif

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //