SpalartAllmarasDES.H

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    Copyright (C) 2011-2016 OpenFOAM Foundation
    Copyright (C) 2015-2019 OpenCFD Ltd.
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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::LESModels::SpalartAllmarasDES
 
Group
    grpDESTurbulence
 
Description
    SpalartAllmarasDES DES turbulence model for incompressible and
    compressible flows
 
    Reference:
    \verbatim
        Spalart, P. R., Jou, W. H., Strelets, M., & Allmaras, S. R. (1997).
        Comments on the feasibility of LES for wings, and on a hybrid
        RANS/LES approach.
        Advances in DNS/LES, 1, 4-8.
    \endverbatim
 
    Including the low Reynolds number correction documented in
    \verbatim
        Spalart, P. R., Deck, S., Shur, M.L., Squires, K.D., Strelets, M.Kh,
        Travin, A. (2006).
        A new version of detached-eddy simulation, resistant to ambiguous grid
        densities.
        Theor. Comput. Fluid Dyn., 20, 181-195.
    \endverbatim
 
Note
    The default value of the DES constant implemented was calibrated for
    OpenFOAM using decaying isotropic turbulence and agrees with the value
    suggested in the reference publication.
 
SourceFiles
    SpalartAllmarasDES.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef SpalartAllmarasDES_H
#define SpalartAllmarasDES_H
 
#include "DESModel.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace LESModels
{
 
/*---------------------------------------------------------------------------*\
                        Class SpalartAllmarasDES Declaration
\*---------------------------------------------------------------------------*/
 
template<class BasicTurbulenceModel>
class SpalartAllmarasDES
:
    public DESModel<BasicTurbulenceModel>
{
    // Private Member Functions
 
        //- No copy construct
        SpalartAllmarasDES(const SpalartAllmarasDES&) = delete;
 
        //- No copy assignment
        void operator=(const SpalartAllmarasDES&) = delete;
 
 
protected:
 
    // Protected data
 
        // Model constants
 
            dimensionedScalar sigmaNut_;
            dimensionedScalar kappa_;
 
            dimensionedScalar Cb1_;
            dimensionedScalar Cb2_;
            dimensionedScalar Cw1_;
            dimensionedScalar Cw2_;
            dimensionedScalar Cw3_;
            dimensionedScalar Cv1_;
            dimensionedScalar Cs_;
            dimensionedScalar CDES_;
            dimensionedScalar ck_;
 
 
            // Low Reynolds number correction
 
                Switch lowReCorrection_;
                dimensionedScalar Ct3_;
                dimensionedScalar Ct4_;
                dimensionedScalar fwStar_;
 
 
        // Fields
 
            volScalarField nuTilda_;
 
            //- Wall distance
            //  Note: different to wall distance in parent RASModel
            //  which is for near-wall cells only
            const volScalarField& y_;
 
 
    // Protected Member Functions
 
        tmp<volScalarField> chi() const;
 
        tmp<volScalarField> fv1(const volScalarField& chi) const;
 
        tmp<volScalarField> fv2
        (
            const volScalarField& chi,
            const volScalarField& fv1
        ) const;
 
        tmp<volScalarField> ft2(const volScalarField& chi) const;
 
        tmp<volScalarField> Omega(const volTensorField& gradU) const;
 
        tmp<volScalarField> Stilda
        (
            const volScalarField& chi,
            const volScalarField& fv1,
            const volScalarField& Omega,
            const volScalarField& dTilda
        ) const;
 
        tmp<volScalarField> r
        (
            const volScalarField& nur,
            const volScalarField& Omega,
            const volScalarField& dTilda
        ) const;
 
        tmp<volScalarField> fw
        (
            const volScalarField& Omega,
            const volScalarField& dTilda
        ) const;
 
        tmp<volScalarField> psi
        (
            const volScalarField& chi,
            const volScalarField& fv1
        ) const;
 
        //- Length scale
        virtual tmp<volScalarField> dTilda
        (
            const volScalarField& chi,
            const volScalarField& fv1,
            const volTensorField& gradU
        ) const;
 
        void correctNut(const volScalarField& fv1);
        virtual void correctNut();
 
 
public:
 
    typedef typename BasicTurbulenceModel::alphaField alphaField;
    typedef typename BasicTurbulenceModel::rhoField rhoField;
    typedef typename BasicTurbulenceModel::transportModel transportModel;
 
 
    //- Runtime type information
    TypeName("SpalartAllmarasDES");
 
 
    // Constructors
 
        //- Construct from components
        SpalartAllmarasDES
        (
            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 ~SpalartAllmarasDES() = default;
 
 
    // Member Functions
 
        //- Re-read model coefficients if they have changed
        virtual bool read();
 
        //- Return the effective diffusivity for nuTilda
        tmp<volScalarField> DnuTildaEff() const;
 
        //- Return SGS kinetic energy
        virtual tmp<volScalarField> k() const;
 
        tmp<volScalarField> nuTilda() const
        {
            return nuTilda_;
        }
 
        //- Return the LES field indicator
        virtual tmp<volScalarField> LESRegion() const;
 
        //- Correct nuTilda and related properties
        virtual void correct();
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace LESModels
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "SpalartAllmarasDES.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //