code_saturne User's Forum

Hi, I need to model a head loss region about 0.1 m thick with a pressure drop of about 800 Pa for a water velocity through the region of about 0.00173 m/s. It is also near an outlet, but I don't think that is the main problem as when I move the region away from the outlet I still have the same problem of divergence. I can get a converged solution easily for small pressure drops of 45 Pa (alpha of 5000) but when I increase alpha to 10000 or above, inflow starts at the outlet, blocking of part of the outlet is carried out by code saturne and the solution diverges. I have reproduced the problem in a simple vertical pipe problem with a tetrahedral mesh, attached in my post last week. I also have setup a prismatic mesh model, attached here including .hdf, .med, and code saturne, but still have the same problem. I would greatly appreciate some help.
Regards,
Floren

Hi plaza,

The value of 45Pa is obtained from an estimation or from the post process of your result.
How you apply your head losses coefficients (axx = ayy = azz or axx=ayy=0 , azz=5000)?
Also can you send us your listing file of your case, I would like to check your options.

Yohann