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    Copyright (C) 2011 OpenFOAM Foundation
    Copyright (C) 2022 OpenCFD Ltd.
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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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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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    You should have received a copy of the GNU General Public License
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Class
    Foam::multiphaseEuler::dragModels::WenYu

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'

    NB: The difference between the Gidaspow-version is the void-fraction
        in the Re-number

SourceFiles
    WenYu.C

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

#ifndef Foam_multiphaseEuler_dragModels_WenYu_H
#define Foam_multiphaseEuler_dragModels_WenYu_H

#include "dragModel.H"

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

namespace Foam
{
namespace multiphaseEuler
{
namespace dragModels
{

/*---------------------------------------------------------------------------*\
                           Class WenYu Declaration
\*---------------------------------------------------------------------------*/

class WenYu
:
    public dragModel
{

public:

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


    // Constructors

        //- Construct from components
        WenYu
        (
            const dictionary& interfaceDict,
            const phaseModel& phase1,
            const phaseModel& phase2
        );


    //- Destructor
    virtual ~WenYu();


    // Member Functions

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


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

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

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

#endif

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