[Youwu]

Hi all,
I'm working on k - omega SST model recently. After reading the code, I found a problem.
In the definition of epsilonByk, omega_() is used:

template<class BasicEddyViscosityModel>
tmp<volScalarField::Internal>
kOmegaSSTBase<BasicEddyViscosityModel>::epsilonByk
(
    const volScalarField& F1,
    const volTensorField& gradU
) const
{
    return betaStar_*omega_();
}

However, in the definition of F2, omega_ is used:

template<class BasicEddyViscosityModel>
tmp<volScalarField> kOmegaSSTBase<BasicEddyViscosityModel>::F2() const
{
    tmp<volScalarField> arg2 = min
    (
        max
        (
            (scalar(2)/betaStar_)*sqrt(k_)/(omega_*y_),
            scalar(500)*(this->mu()/this->rho_)/(sqr(y_)*omega_)
        ),
        scalar(100)
    );
    return tanh(sqr(arg2));
}

I tried to output omega_ and omega_() into a log file, and they are exactly the same volscalarfield.
But sometimes when I tried to change omega_() into omega_, I got compiling errors.
So, what's the difference between omega_ and omega_()? What
do those parentheses mean?

[geth03]

i think omega_ is the variable and omega_() is the getter function for omega_.