Smagorinsky.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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    the Free Software Foundation, either version 3 of the License, or
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Class
    Foam::LESModels::Smagorinsky
 
Group
    grpLESTurbulence
 
Description
    The Smagorinsky SGS model.
 
    Reference:
    \verbatim
        Smagorinsky, J. (1963).
        General circulation experiments with the primitive equations: I.
        The basic experiment*.
        Monthly weather review, 91(3), 99-164.
    \endverbatim
 
    The form of the Smagorinsky model implemented is obtained from the
    k-equation model assuming local equilibrium which provides estimates of both
    k and epsilon separate from the sub-grid scale viscosity:
 
    \verbatim
        B = 2/3*k*I - 2*nuSgs*dev(D)
 
    where
 
        D = symm(grad(U));
        k from D:B + Ce*k^3/2/delta = 0
        nuSgs = Ck*sqrt(k)*delta
    \endverbatim
 
    The default model coefficients are
    \verbatim
        SmagorinskyCoeffs
        {
            Ck                  0.094;
            Ce                  1.048;
        }
    \endverbatim
 
See also
    Foam::LESModels::kEqn
 
SourceFiles
    Smagorinsky.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef Smagorinsky_H
#define Smagorinsky_H
 
#include "LESModel.H"
#include "LESeddyViscosity.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace LESModels
{
 
/*---------------------------------------------------------------------------*\
                           Class Smagorinsky Declaration
\*---------------------------------------------------------------------------*/
 
template<class BasicTurbulenceModel>
class Smagorinsky
:
    public LESeddyViscosity<BasicTurbulenceModel>
{
    // Private Member Functions
 
        //- No copy construct
        Smagorinsky(const Smagorinsky&) = delete;
 
        //- No copy assignment
        void operator=(const Smagorinsky&) = delete;
 
 
protected:
 
    // Protected data
 
        dimensionedScalar Ck_;
 
 
    // Protected Member Functions
 
        //- Return SGS kinetic energy
        //  calculated from the given velocity gradient
        tmp<volScalarField> k(const tmp<volTensorField>& gradU) const;
 
        //- Update the SGS eddy viscosity
        virtual void correctNut();
 
 
public:
 
    typedef typename BasicTurbulenceModel::alphaField alphaField;
    typedef typename BasicTurbulenceModel::rhoField rhoField;
    typedef typename BasicTurbulenceModel::transportModel transportModel;
 
 
    //- Runtime type information
    TypeName("Smagorinsky");
 
 
    // Constructors
 
        //- Construct from components
        Smagorinsky
        (
            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 ~Smagorinsky() = default;
 
 
    // Member Functions
 
        //- Read model coefficients if they have changed
        virtual bool read();
 
        //- Return SGS kinetic energy
        virtual tmp<volScalarField> k() const
        {
            return k(fvc::grad(this->U_));
        }
 
        //- Return sub-grid dissipation rate
        virtual tmp<volScalarField> epsilon() const;
 
        //- Return sub-grid specific dissipation rate
        virtual tmp<volScalarField> omega() const;
 
        //- Correct Eddy-Viscosity and related properties
        virtual void correct();
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace LESModels
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "Smagorinsky.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //