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May 6, 2012, 00:22 
SST kw modelthe parameter 'omega' does not convergence

#1 
New Member
Yangyang
Join Date: Aug 2011
Posts: 9
Rep Power: 7 
Hi everyone,
I use SST kw model simulate air flow in a duct. However, the parameter 'omega' does not convergence (about 5e2). This is happen in all my casedifferent mesh (good and bad) and different y+(120). Does anyone have any ideal to help me fix the problem? Thanks. 

May 6, 2012, 14:21 

#2  
Senior Member
Lucky Tran
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 1,306
Rep Power: 20 
Quote:
Check some actual engineering values to see your simulation is converged. Scaled residuals are a poor method for judging convergence in the first place. How many iterations have you tried? 

May 6, 2012, 16:14 

#3  
New Member
Yangyang
Join Date: Aug 2011
Posts: 9
Rep Power: 7 
Quote:
The good mesh is in smooth duct geometry with Quad map type mesh (The mesh uniform everywhere). The bad mesh is in some roughness surface duct (The skew>98). Can you tell me how can I check the actual engineering values to see the simulation is converged? I have tried 2000 iterations but the parameter 'omege' is not changed after just 25 iterations (keep at 5e2) and other parameters are not changed after 500 iterations. Any more idea to solve this problem? Thanks. 

May 6, 2012, 16:42 

#4  
Senior Member
Lucky Tran
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 1,306
Rep Power: 20 
Quote:
Check solution values by creating point, line, or surface monitors of some relevant engineering quantities (pressure, velocity, temperature, turbulent kinetic energy, etc). 

May 6, 2012, 23:58 

#5  
New Member
Yangyang
Join Date: Aug 2011
Posts: 9
Rep Power: 7 
Quote:
Thank you for your help. 

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