SpalartAllmarasBase.H

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    Copyright (C) 2015-2022 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
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Class
    Foam::LESModels::SpalartAllmarasBase
 
Group
    grpDESTurbulence
 
Description
    Base class to handle various characteristics for \c SpalartAllmaras based
    LES/DES turbulence models for incompressible and compressible flows.
 
    References:
    \verbatim
        Standard model:
            Spalart, P.R., & Allmaras, S.R. (1994).
            A one-equation turbulence model for aerodynamic flows.
            La Recherche Aerospatiale, 1, 5-21.
 
        Standard model:
            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.
 
        Estimation expression for k and epsilon (tag:B), Eq. 4.50:
            Bourgoin, A. (2019).
            Bathymetry induced turbulence modelling the
            Alderney Race site: regional approach with TELEMAC-LES.
            Normandie Université.
 
        Estimation expressions for omega (tag:P):
            Pope, S. B. (2000).
            Turbulent flows.
            Cambridge, UK: Cambridge Univ. Press
            DOI:10.1017/CBO9780511840531
    \endverbatim
 
SourceFiles
    SpalartAllmarasBase.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef Foam_SpalartAllmarasBase_H
#define Foam_SpalartAllmarasBase_H
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                    Class SpalartAllmarasBase Declaration
\*---------------------------------------------------------------------------*/
 
template<class BasicEddyViscosityModel>
class SpalartAllmarasBase
:
    public BasicEddyViscosityModel
{
    // Private Member Functions
 
        //- No copy construct
        SpalartAllmarasBase(const SpalartAllmarasBase&) = delete;
 
        //- No copy assignment
        void operator=(const SpalartAllmarasBase&) = 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 ck_;
 
            Switch ft2_;
            dimensionedScalar Ct3_;
            dimensionedScalar Ct4_;
 
 
        // Fields
 
            //- Modified kinematic viscosity [m^2/s]
            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> r
        (
            const volScalarField& nur,
            const volScalarField& Stilda,
            const volScalarField& dTilda
        ) const;
 
        tmp<volScalarField::Internal> fw
        (
            const volScalarField& Stilda,
            const volScalarField& dTilda
        ) const;
 
        virtual tmp<volScalarField> Stilda
        (
            const volScalarField& chi,
            const volScalarField& fv1,
            const volTensorField& gradU,
            const volScalarField& dTilda
        ) const;
 
        //- Length scale
        virtual tmp<volScalarField> dTilda
        (
            const volScalarField& chi,
            const volScalarField& fv1,
            const volTensorField& gradU
        ) const = 0;
 
        void correctNut(const volScalarField& fv1);
        virtual void correctNut();
 
 
public:
 
    typedef typename BasicEddyViscosityModel::alphaField alphaField;
    typedef typename BasicEddyViscosityModel::rhoField rhoField;
    typedef typename BasicEddyViscosityModel::transportModel transportModel;
 
 
    // Constructors
 
        //- Construct from components
        SpalartAllmarasBase
        (
            const word& type,
            const alphaField& alpha,
            const rhoField& rho,
            const volVectorField& U,
            const surfaceScalarField& alphaRhoPhi,
            const surfaceScalarField& phi,
            const transportModel& transport,
            const word& propertiesName = turbulenceModel::propertiesName
        );
 
 
    //- Destructor
    virtual ~SpalartAllmarasBase() = 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 the (estimated) turbulent kinetic energy
        virtual tmp<volScalarField> k() const;
 
        //- Return the (estimated) turbulent kinetic energy dissipation rate
        virtual tmp<volScalarField> epsilon() const;
 
        //- Return the (estimated) specific dissipation rate
        virtual tmp<volScalarField> omega() const;
 
        //- Return the modified kinematic viscosity
        tmp<volScalarField> nuTilda() const
        {
            return nuTilda_;
        }
 
        //- Correct nuTilda and related properties
        virtual void correct();
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "SpalartAllmarasBase.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //