qZeta.H

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    Copyright (C) 2019-2020 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.
 
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Class
    Foam::incompressible::RASModels::qZeta
 
Group
    grpIcoRASTurbulence
 
Description
    Gibson and Dafa'Alla's q-zeta two-equation low-Re turbulence model
    for incompressible flows
 
    This turbulence model is described in:
    \verbatim
        Dafa'Alla, A.A., Juntasaro, E. & Gibson, M.M. (1996).
        Calculation of oscillating boundary layers with the
        q-zeta turbulence model.
        Engineering Turbulence Modelling and Experiments 3:
        Proceedings of the Third International Symposium,
        Crete, Greece, May 27-29, 141.
    \endverbatim
    which is a development of the original q-zeta model described in:
    \verbatim
        Gibson, M. M., & Dafa'Alla, A. A. (1995).
        Two-equation model for turbulent wall flow.
        AIAA journal, 33(8), 1514-1518.
    \endverbatim
 
SourceFiles
    qZeta.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef qZeta_H
#define qZeta_H
 
#include "turbulentTransportModel.H"
#include "eddyViscosity.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace incompressible
{
namespace RASModels
{
 
/*---------------------------------------------------------------------------*\
                           Class qZeta Declaration
\*---------------------------------------------------------------------------*/
 
class qZeta
:
    public eddyViscosity<incompressible::RASModel>
{
 
protected:
 
    // Protected data
 
        // Model coefficients
 
            dimensionedScalar Cmu_;
            dimensionedScalar C1_;
            dimensionedScalar C2_;
            dimensionedScalar sigmaZeta_;
            Switch anisotropic_;
 
        //- Lower limit of q
        dimensionedScalar qMin_;
 
        //- Lower limit of zeta
        dimensionedScalar zetaMin_;
 
        // Fields
 
            volScalarField k_;
            volScalarField epsilon_;
 
            volScalarField q_;
            volScalarField zeta_;
 
 
    // Protected Member Functions
 
        tmp<volScalarField> fMu() const;
        tmp<volScalarField> f2() const;
        virtual void correctNut();
 
 
public:
 
    //- Runtime type information
    TypeName("qZeta");
 
    // Constructors
 
        //- Construct from components
        qZeta
        (
            const geometricOneField& alpha,
            const geometricOneField& rho,
            const volVectorField& U,
            const surfaceScalarField& alphaRhoPhi,
            const surfaceScalarField& phi,
            const transportModel& transport,
            const word& propertiesName = turbulenceModel::propertiesName,
            const word& type = typeName
        );
 
 
    //- Destructor
    virtual ~qZeta() = default;
 
 
    // Member Functions
 
        //- Re-read model coefficients if they have changed
        virtual bool read();
 
        //- Return the lower allowable limit for q (default: SMALL)
        const dimensionedScalar& qMin() const
        {
            return qMin_;
        }
 
        //- Return the lower allowable limit for zeta (default: SMALL)
        const dimensionedScalar& zetaMin() const
        {
            return zetaMin_;
        }
 
        //- Allow qMin to be changed
        dimensionedScalar& qMin()
        {
            return qMin_;
        }
 
        //- Allow zetaMin to be changed
        dimensionedScalar& zetaMin()
        {
            return zetaMin_;
        }
 
        //- Return the effective diffusivity for q
        tmp<volScalarField> DqEff() const
        {
            return tmp<volScalarField>
            (
                new volScalarField("DqEff", nut_ + nu())
            );
        }
 
        //- Return the effective diffusivity for epsilon
        tmp<volScalarField> DzetaEff() const
        {
            return tmp<volScalarField>
            (
                new volScalarField("DzetaEff", nut_/sigmaZeta_ + 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 (estimated) specific dissipation rate
        virtual tmp<volScalarField> omega() const
        {
            return tmp<volScalarField>::New
            (
                IOobject
                (
                    IOobject::groupName("omega", this->alphaRhoPhi_.group()),
                    this->runTime_.timeName(),
                    this->mesh_
                ),
                epsilon_/(Cmu_*k_)
            );
        }
 
        virtual const volScalarField& q() const
        {
            return q_;
        }
 
        virtual const volScalarField& zeta() const
        {
            return zeta_;
        }
 
        //- Solve the turbulence equations and correct the turbulence viscosity
        virtual void correct();
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace RASModels
} // End namespace incompressible
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //