How to calculate initial omega for k_omega_SST

HaZe · March 20, 2013, 13:59

Hi Foamers,

I'm having problems with my OF Simulation. My case is a internal combustion engine and I'm simulating the gas exchange without combustion. It's probably the turbulence model (k-epsilon) and therefor I'd like to run the simulation again with k-omega-SST. My problem now is how to calculate the initial values for omega in the internal and boundary field. I already searched the forum and had a look into the tutorials. In the cases I had a look at the initial omega varied in a huge range between 4.5e-3 and 77200.

Is there a broad rule how to choose the initial omega?

Regards,
HaZe

haakon · March 20, 2013, 14:50

Have you tried the "Turbulence properties" calculator here at cfd-online.com? You find it under the "Tools" menu at the top.

http://www.cfd-online.com/Tools/turbulence.php

March 20, 2013, 13:59	How to calculate initial omega for k_omega_SST	#1
HaZe New Member Join Date: Jan 2012 Location: Germay - Stuttgart Posts: 21 Rep Power: 0	Hi Foamers, I'm having problems with my OF Simulation. My case is a internal combustion engine and I'm simulating the gas exchange without combustion. It's probably the turbulence model (k-epsilon) and therefor I'd like to run the simulation again with k-omega-SST. My problem now is how to calculate the initial values for omega in the internal and boundary field. I already searched the forum and had a look into the tutorials. In the cases I had a look at the initial omega varied in a huge range between 4.5e-3 and 77200. Is there a broad rule how to choose the initial omega? Regards, HaZe

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
pisoFoam - unstable pressure residual	Industrial_CFD	OpenFOAM Running, Solving & CFD	21	February 24, 2013 15:39
why divergence occures in these cases	immortality	OpenFOAM Running, Solving & CFD	2	January 25, 2013 10:21
Differences between serial and parallel runs	carsten	OpenFOAM Bugs	11	September 12, 2008 11:16
Unknown error	sivakumar	OpenFOAM Pre-Processing	9	September 9, 2008 12:53
Convergence moving mesh	lr103476	OpenFOAM Running, Solving & CFD	30	November 19, 2007 14:09

March 20, 2013, 14:50		#2
haakon Senior Member Join Date: Dec 2011 Posts: 111 Rep Power: 19	Have you tried the "Turbulence properties" calculator here at cfd-online.com? You find it under the "Tools" menu at the top. http://www.cfd-online.com/Tools/turbulence.php