[xshmuel]

Dear openfoamers,

I am trying to run a compressible flow simulation using the komegaSST model in rhocentralfoam. Im not that well known with compressible turbulence modeling and when I ran the simulation i got the error I am missing alphat in my initial conditions. My question is what is alphat (in the physical sense) and how do I calculate the initial values for it?

appreciate the help

[Robin.Kamenicky]

Hi xshmuel,

The alphat is turbulent thermal diffusivity and is used to get effective thermal diffusivity alphaEff used, as can be seen in rhoCentralFoam.C, in the energy equation of viscid fluid in laplacian term.

The alphat value is:

alphat_ = this->rho_*this->nut()/Prt_;

.

Following thread might help further:
alphat

Hope this helps, cheers,
Robin