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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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Class
    Foam::dragModels::ShiRzehakDrag

Description
    Modified drag model by Shi and Rzehak (2020) for disperse phase due
    to turbulence.

    \verbatim
        Shi, P., & Rzehak, R. (2020).
        Solid-liquid flow in stirred tanks: Euler-Euler / RANS modeling.
        Chemical Engineering Science, 227, 115875.
    \endverbatim

    Note: Contrary to the original formulation the drag coefficient may
          be selected by the user instead of a fixed Schiller-Naumann
          formulation.

SourceFiles
    ShiRzehakDrag.C

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

#ifndef ShiRzehakDrag_H
#define ShiRzehakDrag_H

#include "dispersedDragModel.H"
#include "phaseCompressibleMomentumTransportModel.H"

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

namespace Foam
{

class dragModel;

namespace dragModels
{

/*---------------------------------------------------------------------------*\
                        Class ShiRzehakDrag Declaration
\*---------------------------------------------------------------------------*/

class ShiRzehakDrag
:
    public dispersedDragModel
{
    // Private Data

        //- Underlying basic drag model for drag coefficient
        autoPtr<dragModel> dragModel_;

        //- Constant to describe the Eulerian longitudinal
        //  integral length scale
        const dimensionedScalar CLambda_;

        //- Constant to describe the Lagrangian integral timescale
        //  following the fluid motion
        const dimensionedScalar CT_;


public:

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


    // Constructors

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


    //- Destructor
    virtual ~ShiRzehakDrag();


    // Member Functions

        //- Drag coefficient
        virtual tmp<volScalarField> CdRe() const;
};


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

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

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

#endif

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