kEpsilonLopesdaCosta.H

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2018 OpenFOAM Foundation
    Copyright (C) 2020-2021 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.

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Class
    Foam::RASModels::kEpsilonLopesdaCosta

Group
    grpRASTurbulence

Description
    Variant of the standard k-epsilon turbulence model with additional source
    terms to handle the changes in turbulence in porous regions represented by
    the powerLawLopesdaCosta porosity model.

    Reference:
    \verbatim
        Costa, J. C. P. L. D. (2007).
        Atmospheric flow over forested and non-forested complex terrain.
    \endverbatim

    The default model coefficients are
    \verbatim
        kEpsilonLopesdaCostaCoeffs
        {
            Cmu         0.09;
            C1          1.44;
            C2          1.92;
            sigmak      1.0;
            sigmaEps    1.3;
        }
    \endverbatim

See also
    Foam::RASModels::kEpsilon
    Foam::porosityModels::powerLawLopesdaCosta

SourceFiles
    kEpsilonLopesdaCosta.C

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

#ifndef kEpsilonLopesdaCosta_H
#define kEpsilonLopesdaCosta_H

#include "RASModel.H"
#include "eddyViscosity.H"
#include "powerLawLopesdaCosta.H"

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

namespace Foam
{
namespace RASModels
{

/*---------------------------------------------------------------------------*\
                    Class kEpsilonLopesdaCosta Declaration
\*---------------------------------------------------------------------------*/

template<class BasicTurbulenceModel>
class kEpsilonLopesdaCosta
:
    public eddyViscosity<RASModel<BasicTurbulenceModel>>
{
    // Private Member Functions

        //- No copy construct
        kEpsilonLopesdaCosta(const kEpsilonLopesdaCosta&) = delete;

        //- No copy assignment
        void operator=(const kEpsilonLopesdaCosta&) = delete;


protected:

    // Protected data

        // Standard model coefficients

            volScalarField Cmu_;
            volScalarField::Internal C1_;
            volScalarField::Internal C2_;
            volScalarField sigmak_;
            volScalarField sigmaEps_;

        // Lopes da Costa porosity coefficients

            volScalarField::Internal CdSigma_;
            volScalarField::Internal betap_;
            volScalarField::Internal betad_;
            volScalarField::Internal C4_;
            volScalarField::Internal C5_;


        // Fields

            volScalarField k_;
            volScalarField epsilon_;


    // Protected Member Functions

        void setPorosityCoefficient
        (
            volScalarField::Internal& C,
            const porosityModels::powerLawLopesdaCosta& pm
        );

        void setCdSigma
        (
            volScalarField::Internal& C,
            const porosityModels::powerLawLopesdaCosta& pm
        );

        void setPorosityCoefficients();

        virtual void correctNut();

        virtual tmp<fvScalarMatrix> kSource
        (
            const volScalarField::Internal& magU,
            const volScalarField::Internal& magU3
        ) const;

        virtual tmp<fvScalarMatrix> epsilonSource
        (
            const volScalarField::Internal& magU,
            const volScalarField::Internal& magU3
        ) const;


public:

    typedef typename BasicTurbulenceModel::alphaField alphaField;
    typedef typename BasicTurbulenceModel::rhoField rhoField;
    typedef typename BasicTurbulenceModel::transportModel transportModel;


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


    // Constructors

        //- Construct from components
        kEpsilonLopesdaCosta
        (
            const alphaField& alpha,
            const rhoField& rho,
            const volVectorField& U,
            const surfaceScalarField& alphaRhoPhi,
            const surfaceScalarField& phi,
            const transportModel& transport,
            const word& propertiesName = turbulenceModel::propertiesName,
            const word& type = typeName
        );


    //- Destructor
    virtual ~kEpsilonLopesdaCosta() = default;


    // Member Functions

        //- Re-read model coefficients if they have changed
        virtual bool read();

        //- Return the effective diffusivity for k
        tmp<volScalarField> DkEff() const
        {
            return tmp<volScalarField>
            (
                new volScalarField
                (
                    "DkEff",
                    (this->nut_/sigmak_ + this->nu())
                )
            );
        }

        //- Return the effective diffusivity for epsilon
        tmp<volScalarField> DepsilonEff() const
        {
            return tmp<volScalarField>
            (
                new volScalarField
                (
                    "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_;
        }

        //- Solve the turbulence equations and correct the turbulence viscosity
        virtual void correct();
};


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

} // End namespace RASModels
} // End namespace Foam

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

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

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

#endif

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