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-   -   k-omega simulation without wall functions (http://www.cfd-online.com/Forums/openfoam/71990-k-omega-simulation-without-wall-functions.html)

vkrastev January 21, 2010 14:10

k-omega simulation without wall functions
 
Hi every body, I'm an almost brand new OF user, and I have to simulate a simple 2d aerodynamics case, with a solid profile immersed into an airflow. The simulation has to be performed with a k-omega turbulence model but without any wall functions. My intention is to use the pisoFoam solver (I have already used it, but with a k-epsilon model with wall functions). So the questions are:

1) How can I (in general terms) perform a RANS simulation in OF without wall functions? What kind of BC's may I set (especially at the solid walls)?

2) How can I do it with a k-omega model (both in the standard or sst versions)?

Thank you in advance

ps-the case in question is made up by a rectangular ambient, with inlet and outlet sections, in which the profile is immersed. Obviously the upper and lower solid boundaries of the ambient are far distant from the profile itself.

Thomas Baumann January 24, 2010 17:51

Hallo,

look at this posting:
http://www.cfd-online.com/Forums/ope...tml#post241453

You have to set for k and epsilon (omega) values to very small values for the wall boundary conditions. For inlet and outlet conditions you can use the same as for high reynolds turbulence models.
Also you have to set nut to calculated.

Regards

Thomas

bastil January 24, 2010 18:45

Quote:

Originally Posted by Thomas Baumann (Post 243622)
You have to set for k and epsilon (omega) values to very small values for the wall boundary conditions. For inlet and outlet conditions you can use the same as for high reynolds turbulence models.
Also you have to set nut to calculated.
Thomas

And you have to use a low-Re Turbulence model.... Afaik there is no low-Re k-omega model present in 1.6 and 1.6.x. Am I wrong?

Regards BastiL


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