/*---------------------------------------------------------------------------*\
  ==  == ====== ====   ====    |
                    \\     ||  | Multiphase Code Repository by HZDR
  ======   //   ||  || ===//   | Website: https://doi.org/10.14278/rodare.767
  ||  ||  //    ||  // || \\   | License: GPL-3.0-or-later
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-------------------------------------------------------------------------------
License
    This file is part of the Multiphase Code Repository by HZDR.

    Copyright (C) 2025 by Helmholtz-Zentrum Dresden-Rossendorf e.V. (HZDR),
    Website: https://hzdr.de

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    computational fluid dynamics (CFD) from the OpenFOAM Foundation.
    Copyright (C) 2025 by OpenFOAM Foundation, Website: https://openfoam.org

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    files, which OpenFOAM Foundation files were modified, and which files were
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Class
    Foam::dragModels::segregated

Description
    Segregated drag model for use in regions with no obvious dispersed phase.

    Reference:
    \verbatim
        Marschall, H. (2011).
        Towards the numerical simulation of multi-scale two-phase flows.
        PhD Thesis, TU München.
    \endverbatim

SourceFiles
    segregated.C

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

#ifndef segregated_H
#define segregated_H

#include "dragModel.H"
#include "segregatedPhaseInterface.H"

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

namespace Foam
{
namespace dragModels
{

/*---------------------------------------------------------------------------*\
                         Class segregated Declaration
\*---------------------------------------------------------------------------*/

class segregated
:
    public dragModel
{
    // Private Data

        //- Interface
        const segregatedPhaseInterface interface_;

        //- M coefficient
        const dimensionedScalar m_;

        //- N coefficient
        const dimensionedScalar n_;


public:

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


    // Constructors

        //- Construct from a dictionary and an interface
        segregated
        (
            const dictionary& dict,
            const phaseInterface& interface,
            const bool registerObject
        );


    //- Destructor
    virtual ~segregated();


    // Member Functions

        //- The drag function used in the momentum equation
        virtual tmp<volScalarField> K() const;

        //- The drag function Kf used in the face-momentum equations
        virtual tmp<surfaceScalarField> Kf() const;
};


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

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

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

#endif

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