/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | foam-extend: Open Source CFD
   \\    /   O peration     | Version:     4.1
    \\  /    A nd           | Web:         http://www.foam-extend.org
     \\/     M anipulation  | For copyright notice see file Copyright
-------------------------------------------------------------------------------
License
    This file is part of foam-extend.

    foam-extend 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.

    foam-extend 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 foam-extend.  If not, see <http://www.gnu.org/licenses/>.

Class
    Foam::GidaspowSchillerNaumann

Description
    H, Enwald, E. Peirano, A-E Almstedt
    'Eulerian Two-Phase Flow Theory Applied to Fluidization'
    Int. J. Multiphase Flow, Vol. 22, Suppl, pp. 21-66 (1996)
    Eq. 86-87, p. 40

    This is identical to the Wen and Yu, Rowe model Table 3.6 p.56  in
    the Ph.D. thesis of Berend van Wachem
    'Derivation, Implementation and Validation
                    of
          Computer Simulation Models
         for Gas-Solid Fluidized Beds'

SourceFiles
    GidaspowSchillerNaumann.C

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

#ifndef GidaspowSchillerNaumann_H
#define GidaspowSchillerNaumann_H

#include "dragModel.H"

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

namespace Foam
{

/*---------------------------------------------------------------------------*\
                           Class GidaspowSchillerNaumann Declaration
\*---------------------------------------------------------------------------*/

class GidaspowSchillerNaumann
:
    public dragModel
{

public:

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


    // Constructors

        //- Construct from components
        GidaspowSchillerNaumann
        (
            const dictionary& interfaceDict,
            const volScalarField& alpha,
            const phaseModel& phasea,
            const phaseModel& phaseb
        );


    //- Destructor
    virtual ~GidaspowSchillerNaumann();


    // Member Functions

        tmp<volScalarField> K(const volScalarField& Ur) const;
};


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

} // End namespace Foam

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

#endif

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