|January 21, 2010, 14:10||
k-omega simulation without wall functions
Join Date: Jan 2010
Location: University of Tor Vergata, Rome
Posts: 361Rep Power: 10
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||
Join Date: Apr 2009
Location: Karlsruhe, Germany
Posts: 96Rep Power: 8
look at this posting:
low reynolds re turbulence boundary and yPlus values
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.
|January 24, 2010, 18:45||
Join Date: Mar 2009
Posts: 471Rep Power: 11
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