/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2014-2017 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
2017-05-18 Jeff Heylmun:    Added support of polydisperse phase models
-------------------------------------------------------------------------------
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
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    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::turbulentDispersionModels::Burns

Description
    Turbulent dispersion model of Burns et al.

    References:
    \verbatim
        "Implementation and Comparison of Correlations for interfacial Forces
        in a Gas-Liquid System within an Euler-Euler Framework"
        Otromke, M.,
        PhD Thesis
        April 2013
    \endverbatim

    \verbatim
        "The Favre averaged drag model for turbulent dispersion in Eulerian
         multi-phase flows"
        Burns, A.D., Frank, T., Hamill, I., Shi, J.M.,
        5th international conference on multiphase flow
        Volume 4, Paper 392, May 2004
    \endverbatim

SourceFiles
    Burns.C

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

#ifndef Burns_H
#define Burns_H

#include "turbulentDispersionModel.H"

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

namespace Foam
{

class phasePair;

namespace turbulentDispersionModels
{

/*---------------------------------------------------------------------------*\
                             Class Burns Declaration
\*---------------------------------------------------------------------------*/

class Burns
:
    public turbulentDispersionModel
{
    // Private data

        //- Schmidt number
        const dimensionedScalar sigma_;

        //- Residual phase fraction
        const dimensionedScalar residualAlpha_;


public:

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


    // Constructors

        //- Construct from a dictionary and a phase pair
        Burns
        (
            const dictionary& dict,
            const phasePair& pair
        );


    //- Destructor
    virtual ~Burns();


    // Member Functions

        //- Turbulent diffusivity
        //  multiplying the gradient of the phase-fraction
        virtual tmp<volScalarField> D(const label, const label) const;

        //- Mean turbulent diffusivity
        //  multiplying the gradient of the phase-fraction
        virtual tmp<volScalarField> D() const;
};


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

} // End namespace turbulentDispersionModels
} // End namespace Foam

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

#endif

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