code_saturne User's Forum

While checking drag coefficients on a plate under steady conditions, came across an interesting question - is there a citation for where the k-omega initialization comes from?

For sure it is problem specific and there are different choices one can make, but comparing with default choices in other models like OpenFOAM, I see quite different formula, so thought to check. Also, looking at the source:

https://github.com/code-saturne/code_sa ... nce_kw.cpp

I am surprised at the form of this equation around line 1769; it seems like omega is being initialized by ut2^3 / (1/ut2) / (ut2^2) ... which could be written a bit more simply.

P.S. Apologies if I'm failing my search skills today, but is it possible that k-omega is not undocumented in the theory guide? Looking at the v8.3 one, I would have expected it in the section on eddy viscosity models, and I don't seem to find it.

Hello,

The level of detail in the theory guide is unfortunately far from uniform, and some subtle implementation differences in turbulence models might not be documented (or the matching elements may be spread out over many technical reports, bugtracker issues, ... or change logs, which makes it basically unsearchable).

I'll check with colleagues if they have more info.

Best regards,

Yvan