/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 1991-2010 OpenCFD Ltd.
     \\/     M anipulation  |
-------------------------------------------------------------------------------
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::SpalartAllmaras

Description
    SpalartAllmaras DES (SA + LES) turbulence model for incompressible flows

SourceFiles
    SpalartAllmaras.C

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

#ifndef SpalartAllmaras_H
#define SpalartAllmaras_H

#include <incompressibleLESModels/LESModel.H>
#include <finiteVolume/volFields.H>
#include <finiteVolume/wallDist.H>

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

namespace Foam
{
namespace incompressible
{
namespace LESModels
{

/*---------------------------------------------------------------------------*\
                        Class SpalartAllmaras Declaration
\*---------------------------------------------------------------------------*/

class SpalartAllmaras
:
    public LESModel
{
    // Private member functions

        //- Update sub-grid scale fields
        void updateSubGridScaleFields();

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


protected:

    // Protected data

        dimensionedScalar sigmaNut_;
        dimensionedScalar kappa_;


        // Model constants

            dimensionedScalar Cb1_;
            dimensionedScalar Cb2_;
            dimensionedScalar Cv1_;
            dimensionedScalar Cv2_;
            dimensionedScalar CDES_;
            dimensionedScalar ck_;
            dimensionedScalar Cw1_;
            dimensionedScalar Cw2_;
            dimensionedScalar Cw3_;


        // Fields

            wallDist y_;
            volScalarField nuTilda_;
            volScalarField nuSgs_;


    // Protected member functions

        virtual tmp<volScalarField> fv1() const;
        virtual tmp<volScalarField> fv2() const;
        virtual tmp<volScalarField> fv3() const;
        virtual tmp<volScalarField> S(const volTensorField& gradU) const;

        virtual tmp<volScalarField> STilda
        (
            const volScalarField& S,
            const volScalarField& dTilda
        ) const;

        virtual tmp<volScalarField> r
        (
            const volScalarField& visc,
            const volScalarField& S,
            const volScalarField& dTilda
        ) const;

        virtual tmp<volScalarField> fw
        (
            const volScalarField& S,
            const volScalarField& dTilda
        ) const;

        //- Length scale
        virtual tmp<volScalarField> dTilda(const volScalarField& S) const;


public:

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


    // Constructors

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


    //- Destructor
    virtual ~SpalartAllmaras()
    {}


    // Member Functions

        //- Return SGS kinetic energy
        virtual tmp<volScalarField> k() const;

        //- Return sub-grid disipation rate
        virtual tmp<volScalarField> epsilon() const;

        tmp<volScalarField> nuTilda() const
        {
            return nuTilda_;
        }

        //- Return SGS viscosity
        virtual tmp<volScalarField> nuSgs() const
        {
            return nuSgs_;
        }

        //- Return the sub-grid stress tensor.
        virtual tmp<volSymmTensorField> B() const;

        //- Return the effective sub-grid turbulence stress tensor
        //  including the laminar stress
        virtual tmp<volSymmTensorField> devBeff() const;

        //- Return the deviatoric part of the divergence of Beff
        //  i.e. the additional term in the filtered NSE.
        virtual tmp<fvVectorMatrix> divDevBeff(volVectorField& U) const;

        //- Correct nuTilda 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

// ************************ vim: set sw=4 sts=4 et: ************************ //
