# k-omega simulation without wall functions

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 January 21, 2010, 14:10 k-omega simulation without wall functions #1 Senior Member   Vesselin Krastev Join Date: Jan 2010 Location: University of Tor Vergata, Rome Posts: 364 Rep Power: 12 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.

 January 24, 2010, 17:51 #2 Member   Join Date: Apr 2009 Location: Karlsruhe, Germany Posts: 96 Rep Power: 10 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 elham usefi likes this.

January 24, 2010, 18:45
#3
Senior Member

BastiL
Join Date: Mar 2009
Posts: 488
Rep Power: 13
Quote:
 Originally Posted by Thomas Baumann 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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