binaryDiffusionCoefficient.H

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License
    This file is part of OpenFOAM.
 
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    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
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Class
    Foam::Function2s::binaryDiffusionCoefficient
 
Description
    Binary diffusion coefficient polynomial function of the log of temperature
    correcting the standard kinetic theory temperature dependence.
 
    \verbatim
        Dji = T^(3/2)*(c0 + c1*lnT + c2*lnT^2 + c3*lnT^3 + c4*lnT^4)/p
    \endverbatim
 
SourceFiles
    binaryDiffusionCoefficient.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef binaryDiffusionCoefficient_H
#define binaryDiffusionCoefficient_H
 
#include "Function2.H"
#include "Polynomial.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace Function2s
{
 
/*---------------------------------------------------------------------------*\
          Class binaryDiffusionCoefficient Declaration
\*---------------------------------------------------------------------------*/
 
class binaryDiffusionCoefficient
:
    public FieldFunction2<scalar, binaryDiffusionCoefficient>
{
    // Private Data
 
        //- Polynomial coefficients
        Polynomial<5> coeffs_;
 
 
public:
 
    //- Runtime type information
    TypeName("binaryDiffusionCoefficient");
 
 
    // Constructors
 
        //- Construct from name and coefficients
        binaryDiffusionCoefficient
        (
            const word& name,
            const Polynomial<5> coeffs
        );
 
        //- Construct from name and dictionary
        binaryDiffusionCoefficient
        (
            const word& name,
            const unitConversions& units,
            const dictionary& dict
        );
 
        //- Construct and return a clone
        virtual tmp<Function2<scalar>> clone() const
        {
            return tmp<Function2<scalar>>
            (
                new binaryDiffusionCoefficient(*this)
            );
        }
 
 
    // Member Functions
 
        //- Binary diffusion coefficient function of pressure and temperature
        virtual scalar value(scalar p, scalar T) const
        {
            return T*sqrt(T)*coeffs_.value(log(T))/p;
        }
 
        //- Write the function coefficients
        virtual void write(Ostream& os, const unitConversions& units) const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Function2s
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //