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

    Multiphase Code Repository by HZDR is based on the free software for
    computational fluid dynamics (CFD) from the OpenFOAM Foundation.
    Copyright (C) 2025 by OpenFOAM Foundation, Website: https://openfoam.org

    If you are interested in which files are original OpenFOAM Foundation
    files, which OpenFOAM Foundation files were modified, and which files were
    newly created, see FILES.md.

    Multiphase Code Repository by HZDR 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.

    Multiphase Code Repository by HZDR 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
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    You should have received a copy of the GNU General Public License along
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Class
    Foam::dragModel

Description
    Model for drag between phases

SourceFiles
    dragModel.C
    dragModelNew.C

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

#ifndef dragModel_H
#define dragModel_H

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

#include "volFields.H"
#include "dictionary.H"
#include "runTimeSelectionTables.H"
#include "BlendedInterfacialModel.H"

namespace Foam
{

/*---------------------------------------------------------------------------*\
                          Class dragModel Declaration
\*---------------------------------------------------------------------------*/

class dragModel
:
    public regIOobject
{
public:

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


    // Declare runtime construction

        declareRunTimeSelectionTable
        (
            autoPtr,
            dragModel,
            dictionary,
            (
                const dictionary& dict,
                const phaseInterface& interface,
                const bool registerObject
            ),
            (dict, interface, registerObject)
        );


    // Static Data Members

        //- Coefficient dimensions
        static const dimensionSet dimK;


    // Constructors

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


    //- Destructor
    virtual ~dragModel();


    // Selectors

        static autoPtr<dragModel> New
        (
            const dictionary& dict,
            const phaseInterface& interface,
            const bool outer=true,
            const bool registerObject=true
        );


    // Member Functions

        //- Return the drag coefficient K
        //  used in the momentum equations
        //    ddt(alpha1*rho1*U1) + ... = ... K*(U1-U2)
        //    ddt(alpha2*rho2*U2) + ... = ... K*(U2-U1)
        virtual tmp<volScalarField> K() const = 0;

        //- Return the drag coefficient Kf
        //  used in the face-momentum equations
        virtual tmp<surfaceScalarField> Kf() const = 0;

        //- Dummy write for regIOobject
        bool writeData(Ostream& os) const;
};


/*---------------------------------------------------------------------------*\
                      Class blendedDragModel Declaration
\*---------------------------------------------------------------------------*/

class blendedDragModel
:
    public BlendedInterfacialModel<dragModel>
{
public:

    // Constructors

        //- Inherit base class constructors
        using BlendedInterfacialModel<dragModel>::BlendedInterfacialModel;


    // Selectors

        inline static autoPtr<blendedDragModel> New
        (
            const dictionary& dict,
            const phaseInterface& interface,
            const dictionary& blendingDict
        )
        {
            return autoPtr<blendedDragModel>
            (
                new blendedDragModel(dict, interface, blendingDict)
            );
        }


    // Member Functions

        //- Return the drag coefficient K
        tmp<volScalarField> K() const;

        //- Return the drag coefficient Kf
        tmp<surfaceScalarField> Kf() const;
};


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

} // End namespace Foam

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

#endif

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