janafThermo.H

Go to the documentation of this file.

/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2011-2021 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
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::janafThermo

Description
    Enthalpy based thermodynamics package using JANAF tables:

    \verbatim
        Cp = (((a4*T + a3)*T + a2)*T + a1)*T + a0
        ha = ((((a4/5*T + a3/4)*T + a2/3)*T + a1/2)*T + a0)*T + a5
    \endverbatim

Usage
    \table
        Property     | Description
        Tlow         | Lower temperature limit [K]
        Thigh        | Upper temperature limit [K]
        Tcommon      | Transition temperature from low to high polynomials [K]
        lowCpCoeffs  | Low temperature range heat capacity coefficients
        highCpCoeffs | High temperature range heat capacity coefficients
    \endtable

    Example specification of janafThermo for air:
    \verbatim
    thermodynamics
    {
        Tlow            100;
        Thigh           10000;
        Tcommon         1000;

        lowCpCoeffs
        (
            3.5309628
            -0.0001236595
            -5.0299339e-07
            2.4352768e-09
            -1.4087954e-12
            -1046.9637
            2.9674391
        );

        highCpCoeffs
        (
            2.9525407
            0.0013968838
            -4.9262577e-07
            7.8600091e-11
            -4.6074978e-15
            -923.93753
            5.8718221
        );
    }
    \endverbatim

SourceFiles
    janafThermoI.H
    janafThermo.C

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

#ifndef janafThermo_H
#define janafThermo_H

#include "scalar.H"
#include "FixedList.H"

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

namespace Foam
{

// Forward declaration of friend functions and operators

template<class EquationOfState> class janafThermo;

template<class EquationOfState>
inline janafThermo<EquationOfState> operator+
(
    const janafThermo<EquationOfState>&,
    const janafThermo<EquationOfState>&
);

template<class EquationOfState>
inline janafThermo<EquationOfState> operator*
(
    const scalar,
    const janafThermo<EquationOfState>&
);

template<class EquationOfState>
inline janafThermo<EquationOfState> operator==
(
    const janafThermo<EquationOfState>&,
    const janafThermo<EquationOfState>&
);

template<class EquationOfState>
Ostream& operator<<
(
    Ostream&,
    const janafThermo<EquationOfState>&
);


/*---------------------------------------------------------------------------*\
                         Class janafThermo Declaration
\*---------------------------------------------------------------------------*/

template<class EquationOfState>
class janafThermo
:
    public EquationOfState
{

public:

    // Public data

        static const int nCoeffs_ = 7;
        typedef FixedList<scalar, nCoeffs_> coeffArray;


private:

    // Private Data

        // Temperature limits of applicability of functions
        scalar Tlow_, Thigh_, Tcommon_;

        coeffArray highCpCoeffs_;
        coeffArray lowCpCoeffs_;


    // Private Member Functions

        //- Check that input data is valid
        void checkInputData() const;

        //- Return the coefficients corresponding to the given temperature
        inline const coeffArray& coeffs(const scalar T) const;


public:

    // Constructors

        //- Construct from components
        inline janafThermo
        (
            const EquationOfState& st,
            const scalar Tlow,
            const scalar Thigh,
            const scalar Tcommon,
            const coeffArray& highCpCoeffs,
            const coeffArray& lowCpCoeffs,
            const bool convertCoeffs = false
        );

        //- Construct from dictionary
        janafThermo(const dictionary& dict);

        //- Construct as a named copy
        inline janafThermo(const word&, const janafThermo&);


    // Member Functions

        //- Return the instantiated type name
        static word typeName()
        {
            return "janaf<" + EquationOfState::typeName() + '>';
        }

        //- Limit the temperature to be in the range Tlow_ to Thigh_
        inline scalar limit(const scalar T) const;


        // Access

            //- Return const access to the low temperature limit
            inline scalar Tlow() const;

            //- Return const access to the high temperature limit
            inline scalar Thigh() const;

            //- Return const access to the common temperature
            inline scalar Tcommon() const;

            //- Return const access to the high temperature poly coefficients
            inline const coeffArray& highCpCoeffs() const;

            //- Return const access to the low temperature poly coefficients
            inline const coeffArray& lowCpCoeffs() const;


        // Fundamental properties

            //- Heat capacity at constant pressure [J/kg/K]
            inline scalar Cp(const scalar p, const scalar T) const;

            //- Absolute enthalpy [J/kg]
            inline scalar Ha(const scalar p, const scalar T) const;

            //- Sensible enthalpy [J/kg]
            inline scalar Hs(const scalar p, const scalar T) const;

            //- Enthalpy of formation [J/kg]
            inline scalar Hf() const;

            //- Entropy [J/kg/K]
            inline scalar S(const scalar p, const scalar T) const;

            //- Gibbs free energy of the mixture in the standard state [J/kg]
            inline scalar Gstd(const scalar T) const;

            #include "HtoEthermo.H"


        // Derivative term used for Jacobian

            //- Temperature derivative of heat capacity at constant pressure
            inline scalar dCpdT(const scalar p, const scalar T) const;


        // I-O

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


    // Member Operators

        inline void operator+=(const janafThermo&);


    // Friend operators

        friend janafThermo operator+ <EquationOfState>
        (
            const janafThermo&,
            const janafThermo&
        );

        friend janafThermo operator* <EquationOfState>
        (
            const scalar,
            const janafThermo&
        );

        friend janafThermo operator== <EquationOfState>
        (
            const janafThermo&,
            const janafThermo&
        );


    // Ostream Operator

        friend Ostream& operator<< <EquationOfState>
        (
            Ostream&,
            const janafThermo&
        );
};


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

} // End namespace Foam

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

#include "janafThermoI.H"

#ifdef NoRepository
    #include "janafThermo.C"
#endif

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

#endif

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