/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  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::Ergun

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. 104, p. 42

SourceFiles
    Ergun.C

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

#ifndef Ergun_H
#define Ergun_H

#include "dragModel.H"

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

namespace Foam
{

/*---------------------------------------------------------------------------*\
                           Class Ergun Declaration
\*---------------------------------------------------------------------------*/

class Ergun
:
    public dragModel
{

public:

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


    // Constructors

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


    //- Destructor
    virtual ~Ergun();


    // Member Functions

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


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

} // End namespace Foam

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

#endif

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