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    Copyright (C) 2011-2014 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
    (at your option) any later version.

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Class
    Foam::dragModels::GidaspowErgunWenYu

Description
    Gidaspow, Ergun, Wen and Yu drag model

    Reference:
    \verbatim
        "Multiphase flow and fluidization",
        Gidaspow, D.,
        Academic Press, New York, 1994.
    \endverbatim

SourceFiles
    GidaspowErgunWenYu.C

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

#ifndef GidaspowErgunWenYu_H
#define GidaspowErgunWenYu_H

#include "dragModel.H"

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

namespace Foam
{

class phasePair;

namespace dragModels
{

class Ergun;
class WenYu;

/*---------------------------------------------------------------------------*\
                           Class GidaspowErgunWenYu Declaration
\*---------------------------------------------------------------------------*/

class GidaspowErgunWenYu
:
    public dragModel
{
    // Private data

        //- Ergun drag model
        autoPtr<Ergun> Ergun_;

        //- Wen Yu drag model
        autoPtr<WenYu> WenYu_;


public:

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


    // Constructors

        //- Construct from a dictionary and an ordered phase pair
        GidaspowErgunWenYu
        (
            const dictionary& interfaceDict,
            const phasePair& pair,
            const bool registerObject
        );


    //- Destructor
    virtual ~GidaspowErgunWenYu();


    // Member Functions

        //- Drag coefficient
        virtual tmp<volScalarField> CdRe() const;
};


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

} // End namespace dragModels
} // End namespace Foam

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

#endif

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