|December 20, 2011, 13:18||
Turbulence BCs for flow into vacuum chamber
Eric M. Tridas
Join Date: May 2011
Location: Tampa, Florida
Posts: 38Rep Power: 4
I'm simulating airflow into a vacuum chamber through a small diameter capillary (0.508 mm) from atmosphere using rhoCentralFoam. I've modeled the chamber, capillary and small control volume outside of the capillary. My flow becomes turbulent inside of the capillary (Re ~ 5000) and due to high pressure gradients and areas of low Re in my domain I've chosen the k-omega SST model.
I'm having trouble determining the proper boundary condition at the inlet (control volume outside of capillary.) Using the average calculated inlet velocity and length scale from this boundary I get very small values of k and omega (on the order of 1e-4 and 1 respectively.)
My calculated boundary conditions for the walls of the capillary and vacuum chamber are based on Menter's paper and summarized here: http://turbmodels.larc.nasa.gov/sst.html. The omega calculated omega values are extremely high on the order 1E9 and 1E11
If anyone has an suggestions on the topic I would greatly appreciate it.
Thanks in advance.
|Thread||Thread Starter||Forum||Replies||Last Post|
|Turbulence postprocessing||Mohsin||FLUENT||0||September 19, 2011 21:05|
|Turbulent Kinetic Energy||Jabe||FLUENT||3||February 27, 2011 18:40|
|Discussion: Reason of Turbulence!!||Wen Long||Main CFD Forum||3||May 15, 2009 09:52|
|Swirl and Tumble Ratios in IC Chamber - Turbulence||Hussam||FLUENT||0||March 6, 2009 23:41|
|Modeling sudden flow in Vacuum chamber||Sandilya Garimella||FLUENT||0||February 8, 2008 15:04|