kEpsilon.H

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License
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Class
    Foam::RASModels::kEpsilon
 
Description
    Standard k-epsilon turbulence model for incompressible and compressible
    flows including rapid distortion theory (RDT) based compression term.
 
    Reference:
    \verbatim
        Standard model:
            Launder, B. E., & Spalding, D. B. (1972).
            Lectures in mathematical models of turbulence.
 
            Launder, B. E., & Spalding, D. B. (1974).
            The numerical computation of turbulent flows.
            Computer methods in applied mechanics and engineering,
            3(2), 269-289.
 
        For the RDT-based compression term:
            El Tahry, S. H. (1983).
            k-epsilon equation for compressible reciprocating engine flows.
            Journal of Energy, 7(4), 345-353.
    \endverbatim
 
    The default model coefficients are
    \verbatim
        kEpsilonCoeffs
        {
            Cmu         0.09;
            C1          1.44;
            C2          1.92;
            C3          0;
            sigmak      1.0;
            sigmaEps    1.3;
        }
    \endverbatim
 
SourceFiles
    kEpsilon.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef kEpsilon_H
#define kEpsilon_H
 
#include "RASModel.H"
#include "eddyViscosity.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace RASModels
{
 
/*---------------------------------------------------------------------------*\
                          Class kEpsilon Declaration
\*---------------------------------------------------------------------------*/
 
template<class BasicMomentumTransportModel>
class kEpsilon
:
    public eddyViscosity<RASModel<BasicMomentumTransportModel>>
{
protected:
 
    // Protected data
 
        // Model coefficients
 
            dimensionedScalar Cmu_;
            dimensionedScalar C1_;
            dimensionedScalar C2_;
            dimensionedScalar C3_;
            dimensionedScalar sigmak_;
            dimensionedScalar sigmaEps_;
 
        // Fields
 
            volScalarField k_;
            volScalarField epsilon_;
 
 
    // Protected Member Functions
 
        //- Bound epsilon and return Cmu*sqr(k) for nut
        tmp<volScalarField> boundEpsilon();
 
        //- Correct the eddy-viscosity nut
        virtual void correctNut();
 
        //- Source term for the k equation
        virtual tmp<fvScalarMatrix> kSource() const;
 
        //- Source term for the epsilon equation
        virtual tmp<fvScalarMatrix> epsilonSource() const;
 
 
public:
 
    typedef typename BasicMomentumTransportModel::alphaField alphaField;
    typedef typename BasicMomentumTransportModel::rhoField rhoField;
 
 
    //- Runtime type information
    TypeName("kEpsilon");
 
 
    // Constructors
 
        //- Construct from components
        kEpsilon
        (
            const alphaField& alpha,
            const rhoField& rho,
            const volVectorField& U,
            const surfaceScalarField& alphaRhoPhi,
            const surfaceScalarField& phi,
            const viscosity& viscosity,
            const word& type = typeName
        );
 
        //- Disallow default bitwise copy construction
        kEpsilon(const kEpsilon&) = delete;
 
 
    //- Destructor
    virtual ~kEpsilon()
    {}
 
 
    // Member Functions
 
        //- Re-read model coefficients if they have changed
        virtual bool read();
 
        //- Return the effective diffusivity for k
        tmp<volScalarField> DkEff() const
        {
            return volScalarField::New
            (
                "DkEff",
                (this->nut_/sigmak_ + this->nu())
            );
        }
 
        //- Return the effective diffusivity for epsilon
        tmp<volScalarField> DepsilonEff() const
        {
            return volScalarField::New
            (
                "DepsilonEff",
                (this->nut_/sigmaEps_ + this->nu())
            );
        }
 
        //- Return the turbulence kinetic energy
        virtual tmp<volScalarField> k() const
        {
            return k_;
        }
 
        //- Return the turbulence kinetic energy dissipation rate
        virtual tmp<volScalarField> epsilon() const
        {
            return epsilon_;
        }
 
        //- Return the turbulence specific dissipation rate
        virtual tmp<volScalarField> omega() const
        {
            return volScalarField::New
            (
                "omega",
                epsilon_/(Cmu_*k_)
            );
        }
 
        //- Solve the turbulence equations and correct the turbulence viscosity
        virtual void correct();
 
 
    // Member Operators
 
        //- Disallow default bitwise assignment
        void operator=(const kEpsilon&) = delete;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace RASModels
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "kEpsilon.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //