/*---------------------------------------------------------------------------*\
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    \\  /    A nd           | Copyright (C) 2011 OpenFOAM Foundation
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License
    This file is part of OpenFOAM.

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    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::incompressible::LESModels::Smagorinsky

Description
    The Isochoric Smagorinsky Model for incompressible flows.

    Algebraic eddy viscosity SGS model founded on the assumption that
    local equilibrium prevails.
    Thus,
    \verbatim
        B = 2/3*k*I - 2*nuSgs*dev(D)
        Beff = 2/3*k*I - 2*nuEff*dev(D)

    where

        D = symm(grad(U));
        k = (2*ck/ce)*delta^2*||D||^2
        nuSgs = ck*sqrt(k)*delta
        nuEff = nuSgs + nu
    \endverbatim

SourceFiles
    Smagorinsky.C

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

#ifndef Smagorinsky_H
#define Smagorinsky_H

#include "GenEddyVisc.H"

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

namespace Foam
{
namespace incompressible
{
namespace LESModels
{

/*---------------------------------------------------------------------------*\
                           Class Smagorinsky Declaration
\*---------------------------------------------------------------------------*/

class Smagorinsky
:
    public GenEddyVisc
{
    // Private data

        dimensionedScalar ck_;


    // Private Member Functions

        //- Update sub-grid scale fields
        void updateSubGridScaleFields(const volTensorField& gradU);

        // Disallow default bitwise copy construct and assignment
        Smagorinsky(const Smagorinsky&);
        Smagorinsky& operator=(const Smagorinsky&);


public:

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

    // Constructors

        //- Construct from components
        Smagorinsky
        (
            const volVectorField& U,
            const surfaceScalarField& phi,
            transportModel& transport,
            const word& turbulenceModelName = turbulenceModel::typeName,
            const word& modelName = typeName
        );


    //- Destructor
    virtual ~Smagorinsky()
    {}


    // Member Functions

        //- Return SGS kinetic energy
        //  calculated from the given velocity gradient
        tmp<volScalarField> k(const tmp<volTensorField>& gradU) const
        {
            return (2.0*ck_/ce_)*sqr(delta())*magSqr(dev(symm(gradU)));
        }

        //- Return SGS kinetic energy
        virtual tmp<volScalarField> k() const
        {
            return k(fvc::grad(U()));
        }


        //- Correct Eddy-Viscosity and related properties
        virtual void correct(const tmp<volTensorField>& gradU);

        //- Read LESProperties dictionary
        virtual bool read();
};


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

} // End namespace LESModels
} // End namespace incompressible
} // End namespace Foam

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

#endif

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