CFD Online Logo CFD Online URL
Home > Forums > FLUENT

omega residual instability

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   May 26, 2010, 04:38
Default omega residual instability
New Member
Join Date: Feb 2010
Posts: 8
Rep Power: 9
Feitan is on a distinguished road
I have a huge problem concerning omega residual. When I switch from second order discretization scheme to the third order MUSCL one, after some iterations omega residual suddenly goes mad while the others remain stable. Everything is stable using the first order and the second order. I think Iíve tried to modify everything but I havenít found a way to fix this problem yet.
Iím using a K-w SST viscous model with a compressible flow at low mach number. The boundary conditions are pressure inlet and pressure outlet.
Is my problem connected to the mesh quality? If yes, how can I find the zone that needs to be refined?
Thank you very much for your help.
Feitan is offline   Reply With Quote

Old   June 3, 2010, 05:54
New Member
Join Date: Feb 2010
Posts: 8
Rep Power: 9
Feitan is on a distinguished road
Hasn't anyone an answer? a small hint? The simulation that is running now has a omega residual which swings around 1.1e+00 and the others that are constantly decreasing and are all above 5e-04 after 600 iterations. Let me ask this question: are the results valid and correct? How does the omega residual affect the final solution? Can I just ignore it?
Again, thank you very much for your time and help.
Feitan is offline   Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
How to write k and epsilon before the abnormal end xiuying OpenFOAM Running, Solving & CFD 8 August 27, 2013 15:33
Floating point exception error Alan OpenFOAM Running, Solving & CFD 10 April 6, 2012 14:02
Low Mach number Compressible jet flow using LES ankgupta8um OpenFOAM Running, Solving & CFD 7 January 15, 2011 14:38
Computational time sunnysun OpenFOAM Running, Solving & CFD 5 March 16, 2009 04:32
Differences between serial and parallel runs carsten OpenFOAM Bugs 11 September 12, 2008 11:16

All times are GMT -4. The time now is 08:41.