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    Copyright (C) 2020 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.

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    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
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Class
    Foam::laminarModels::generalizedNewtonianViscosityModels::HerschelBulkley

Description
    Herschel-Bulkley generalized Newtonian viscosity model

SourceFiles
    HerschelBulkley.C

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

#ifndef HerschelBulkley_H
#define HerschelBulkley_H

#include "generalizedNewtonianViscosityModel.H"
#include "dimensionedScalar.H"

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

namespace Foam
{
namespace laminarModels
{
namespace generalizedNewtonianViscosityModels
{

/*---------------------------------------------------------------------------*\
                           Class HerschelBulkley Declaration
\*---------------------------------------------------------------------------*/

class HerschelBulkley
:
    public generalizedNewtonianViscosityModel
{
    // Private Data

        dictionary HerschelBulkleyCoeffs_;

        dimensionedScalar n_;
        dimensionedScalar tau0_;


public:

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


    // Constructors

        //- Construct from dictionary (components)
        explicit HerschelBulkley(const dictionary& viscosityProperties);


    //- Destructor
    virtual ~HerschelBulkley() = default;


    // Member Functions

        //- Read transportProperties dictionary
        virtual bool read(const dictionary& viscosityProperties);

        //- Return the laminar viscosity
        virtual tmp<volScalargpuField> nu
        (
            const volScalargpuField& nu0,
            const volScalargpuField& strainRate
        ) const;
};


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

} // End namespace generalizedNewtonianViscosityModels
} // End namespace laminarModels
} // End namespace Foam

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

#endif

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