/*---------------------------------------------------------------------------*\
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-------------------------------------------------------------------------------
    Copyright (C) 2015-2018 OpenFOAM Foundation
-------------------------------------------------------------------------------
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
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    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::saturationModels::polynomial

Description
    Polynomial equation for the saturation vapour temperature in terms of
    the vapour pressure (in Pa).

    \f[
        T_sat = \sum_i C_i p^i
    \f]

    where \f$p\f$ is the pressure in Pa and \f$C\f$ are the coefficients.

    Currently this class only provides \f$T_sat\f$, the inverse function to
    return the vapour pressure for a given temperature are not implemented.

SourceFiles
    polynomial.C

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

#ifndef saturationModels_polynomial_H
#define saturationModels_polynomial_H

#include "saturationModel.H"
#include "Polynomial.H"

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

namespace Foam
{
namespace saturationModels
{

/*---------------------------------------------------------------------------*\
                         Class polynomial Declaration
\*---------------------------------------------------------------------------*/

class polynomial
:
    public saturationModel
{
    // Private data

        //- Polynomial coefficients
        Polynomial<8> C_;


public:

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

    // Constructors

        //- Construct from a dictionary
        polynomial(const dictionary& dict, const objectRegistry& db);


    //- Destructor
    virtual ~polynomial();


    // Member Functions

        //- Saturation pressure
        virtual tmp<volScalarField> pSat(const volScalarField& T) const;

        //- Saturation pressure derivetive w.r.t. temperature
        virtual tmp<volScalarField> pSatPrime(const volScalarField& T) const;

        //- Natural log of the saturation pressure
        virtual tmp<volScalarField> lnPSat(const volScalarField& T) const;

        //- Saturation temperature
        virtual tmp<volScalarField> Tsat(const volScalarField& p) const;
};


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

} // End namespace saturationModels
} // End namespace Foam

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

#endif

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