/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2015-2018 OpenCFD Ltd.
-------------------------------------------------------------------------------
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::radiation::constantTransmissivity

Group
    grpRadiationTransmissivitySubModels

Description
    Constant radiation transmissivity coefficient

SourceFiles
    constantTransmissivity.C

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

#ifndef radiation_constantTransmissivity_H
#define radiation_constantTransmissivity_H

#include "wallTransmissivityModel.H"

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

namespace Foam
{
namespace radiation
{

/*---------------------------------------------------------------------------*\
                   Class constantTransmissivity Declaration
\*---------------------------------------------------------------------------*/

class constantTransmissivity
:
    public wallTransmissivityModel
{

    // Private data

        //- Coefficients dictionary
        dictionary coeffsDict_;

        //- Transmissivity coefficient
        scalar tau_;


public:

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


    // Constructors

        //- Construct from components
        constantTransmissivity(const dictionary& dict, const polyPatch& pp);


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


    // Member Functions

        //- Return transmissivity coefficient
        tmp<scalarField> t
        (
            const label bandI = 0,
            vectorField* incomingDirection = nullptr,
            scalarField* T = nullptr
        ) const;

        //- Return transmissivity on facw
        scalar t
        (
            const label faceI,
            const label bandI = 0,
            const vector dir = Zero,
            const scalar T = 0
        ) const;

        //- Is Grey
        inline bool isGrey() const
        {
            return true;
        }

        //- Number of bands
        inline label nBands() const
        {
            return 1;
        }
};


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

} // End namespace radiation
} // End namespace Foam

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

#endif

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