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    Copyright (C) 2016-2018 OpenFOAM Foundation
    Copyright (C) 2021 OpenCFD Ltd.
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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
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    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::wallBoilingModels::partitioningModels::linear

Description
    A linear model for wall heat flux partitioning based on
    Ioilev et al. (2007) for boiling flows.

    Reference:
    \verbatim
        Ioilev, A., Samigulin, M., Ustinenko, V.,
        Kucherova, P., Tentner, A., Lo, S., & Splawski, A. (2007).
        Advances in the modeling of cladding heat transfer
        and critical heat flux in boiling water reactor fuel assemblies.
        In Proc. 12th International Topical Meeting on Nuclear Reactor
        Thermal Hydraulics (NURETH-12).
        Pittsburgh, Pennsylvania, USA.
    \endverbatim

Usage
    Example of the model specification:
    \verbatim
    partitioningModel
    {
        // Mandatory entries
        type            linear;
        alphaLiquid1    <scalar>;
        alphaLiquid0    <scalar>;
    }
    \endverbatim

    where the entries mean:
    \table
      Property      | Description                       | Type | Reqd | Deflt
      type          | Type name: linear                 | word | yes  | -
      alphaLiquid1  | Model parameters for threshold liquid phase fraction <!--
                    -->                               | scalar | yes  | -
      alphaLiquid0  | Model parameters for threshold liquid phase fraction <!--
                    -->                               | scalar | yes  | -
    \endtable

Note
  - Proposed threshold liquid fractions:
      - alphaLiquid1 0.1
      - alphaLiquid0 0.05

SourceFiles
    linearPartitioningModel.C

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

#ifndef linear_H
#define linear_H

#include "partitioningModel.H"

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

namespace Foam
{
namespace wallBoilingModels
{
namespace partitioningModels
{

/*---------------------------------------------------------------------------*\
                         Class linear Declaration
\*---------------------------------------------------------------------------*/

class linear
:
    public partitioningModel
{
    // Private Data

        //- Model parameters for threshold liquid phase fraction
        scalar alphaLiquid1_;

        //- Model parameters for threshold liquid phase fraction
        scalar alphaLiquid0_;


    // Private Member Functions

        //- No copy construct
        linear(const linear&) = delete;

        //- No copy assignment
        void operator=(const linear&) = delete;


public:

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


    // Constructors

        //- Construct from a dictionary
        linear(const dictionary& dict);


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


    // Member Functions

        //- Calculate and return the wall heat-flux partitioning
        virtual tmp<scalarField> fLiquid(const scalarField& alphaLiquid) const;

        // I-O

            //- Write
            virtual void write(Ostream& os) const;
};


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

} // End namespace partitioningModels
} // End namespace wallBoilingModels
} // End namespace Foam

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

#endif

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