SRIFallOffFunctionI.H

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// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

inline Foam::SRIFallOffFunction::SRIFallOffFunction
(
    const scalar a,
    const scalar b,
    const scalar c,
    const scalar d,
    const scalar e
)
:
    a_(a),
    b_(b),
    c_(c),
    d_(d),
    e_(e)
{}


inline Foam::SRIFallOffFunction::SRIFallOffFunction(const dictionary& dict)
:
    a_(dict.lookup<scalar>("a")),
    b_(dict.lookup<scalar>("b")),
    c_(dict.lookup<scalar>("c")),
    d_(dict.lookup<scalar>("d")),
    e_(dict.lookup<scalar>("e"))
{}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

inline Foam::scalar Foam::SRIFallOffFunction::operator()
(
    const scalar T,
    const scalar Pr
) const
{
    scalar X = 1.0/(1 + sqr(log10(max(Pr, small))));
    return d_*pow(a_*exp(-b_/T) + exp(-T/c_), X)*pow(T, e_);
}


inline Foam::scalar Foam::SRIFallOffFunction::ddT
(
    const scalar Pr,
    const scalar F,
    const scalar dPrdT,
    const scalar T
) const
{
    scalar X = 1.0/(1 + sqr(log10(max(Pr, small))));
    scalar dXdPr = -X*X*2*log10(Pr)/Pr/log(10.0);
    return
        F
       *(
            e_/T
          + X
           *(a_*b_*exp(-b_/T)/sqr(T) - exp(-T/c_)/c_)
           /(a_*exp(-b_/T) + exp(-T/c_))
          + dXdPr*dPrdT*log(a_*exp(-b_/T) + exp(-T/c_))
        );
}


inline Foam::scalar Foam::SRIFallOffFunction::ddc
(
    const scalar Pr,
    const scalar F,
    const scalar dPrdc,
    const scalar T
) const
{
    scalar X = 1.0/(1 + sqr(log10(max(Pr, small))));
    scalar dXdPr = -X*X*2*log10(Pr)/Pr/log(10.0);
    scalar dXdc = dXdPr*dPrdc;
    return F*dXdc*log(a_*exp(-b_/T) + exp(-T/c_));
}


inline void Foam::SRIFallOffFunction::write(Ostream& os) const
{
    writeEntry(os, "a", a_);
    writeEntry(os, "b", b_);
    writeEntry(os, "c", c_);
    writeEntry(os, "d", d_);
    writeEntry(os, "e", e_);
}


// * * * * * * * * * * * * * * * Ostream Operator  * * * * * * * * * * * * * //

inline Foam::Ostream& Foam::operator<<
(
    Foam::Ostream& os,
    const Foam::SRIFallOffFunction& srifof
)
{
    srifof.write(os);
    return os;
}


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