linear.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) 2013-2023 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::linear
 
Description
    Linear equation of state with constant compressibility:
 
    \verbatim
        rho = rho0 + psi*p
    \endverbatim
 
    Coefficient mixing is very inaccurate and not supported,
    so this equation of state is not applicable to mixtures.
 
Usage
    \table
        Property     | Description
        rho0         | Reference density
        psi          | Constant compressibility
    \endtable
 
    Example specification of the linear equation of state:
    \verbatim
    equationOfState
    {
        rho0        1000;
        psi         1e-5;
    }
    \endverbatim
 
SourceFiles
    linearI.H
    linear.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef linear_H
#define linear_H
 
#include "autoPtr.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
// Forward declaration of friend functions and operators
 
template<class Specie> class linear;
 
template<class Specie>
inline linear<Specie> operator+
(
    const linear<Specie>&,
    const linear<Specie>&
);
 
template<class Specie>
inline linear<Specie> operator*
(
    const scalar,
    const linear<Specie>&
);
 
template<class Specie>
inline linear<Specie> operator==
(
    const linear<Specie>&,
    const linear<Specie>&
);
 
template<class Specie>
Ostream& operator<<
(
    Ostream&,
    const linear<Specie>&
);
 
 
/*---------------------------------------------------------------------------*\
                           Class linear Declaration
\*---------------------------------------------------------------------------*/
 
template<class Specie>
class linear
:
    public Specie
{
    // Private Data
 
        //- Compressibility
        scalar psi_;
 
        //- The reference density
        scalar rho0_;
 
 
public:
 
    // Constructors
 
        //- Construct from components
        inline linear
        (
            const Specie& sp,
            const scalar psi,
            const scalar rho0
        );
 
        //- Construct from name and dictionary
        linear(const word& name, const dictionary& dict);
 
        //- Construct as named copy
        inline linear(const word& name, const linear&);
 
        //- Construct and return a clone
        inline autoPtr<linear> clone() const;
 
 
    // Member Functions
 
        //- Return the instantiated type name
        static word typeName()
        {
            return "linear<" + word(Specie::typeName_()) + '>';
        }
 
 
        // Fundamental properties
 
            //- Is the equation of state is incompressible i.e. rho != f(p)
            static const bool incompressible = false;
 
            //- Is the equation of state is isochoric i.e. rho = const
            static const bool isochoric = false;
 
            //- Return density [kg/m^3]
            inline scalar rho(scalar p, scalar T) const;
 
            //- Return enthalpy contribution [J/kg]
            inline scalar H(const scalar p, const scalar T) const;
 
            //- Return Cp contribution [J/(kg K]
            inline scalar Cp(scalar p, scalar T) const;
 
            //- Return internal energy contribution [J/kg]
            inline scalar E(const scalar p, const scalar T) const;
 
            //- Return Cv contribution [J/(kg K]
            inline scalar Cv(scalar p, scalar T) const;
 
            //- Return entropy contribution to the integral of Cp/T [J/kg/K]
            inline scalar Sp(const scalar p, const scalar T) const;
 
            //- Return entropy contribution to the integral of Cv/T [J/kg/K]
            inline scalar Sv(const scalar p, const scalar T) const;
 
            //- Return compressibility [s^2/m^2]
            inline scalar psi(scalar p, scalar T) const;
 
            //- Return compression factor []
            inline scalar Z(scalar p, scalar T) const;
 
            //- Return (Cp - Cv) [J/(kg K]
            inline scalar CpMCv(scalar p, scalar T) const;
 
            //- Return volumetric coefficient of thermal expansion [1/T]
            inline scalar alphav(const scalar p, const scalar T) const;
 
 
        // IO
 
            //- Write to Ostream
            void write(Ostream& os) const;
 
 
    // Member Operators
 
        inline void operator+=(const linear&);
        inline void operator*=(const scalar);
 
 
    // Friend operators
 
        friend linear operator+ <Specie>
        (
            const linear&,
            const linear&
        );
 
        friend linear operator* <Specie>
        (
            const scalar s,
            const linear&
        );
 
        friend linear operator== <Specie>
        (
            const linear&,
            const linear&
        );
 
 
    // Ostream Operator
 
        friend Ostream& operator<< <Specie>
        (
            Ostream&,
            const linear&
        );
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#include "linearI.H"
 
#ifdef NoRepository
    #include "linear.C"
#endif
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //