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-   -   divergence detected in AMG solver (http://www.cfd-online.com/Forums/fluent/50444-divergence-detected-amg-solver.html)

azalina February 2, 2009 01:47

divergence detected in AMG solver
 
what d0es it means by divergence detected in AMG s0luti0n>>is there s0mething t0 d0 with multigrid??h0w can i av0id this thing??

zongtwi February 2, 2009 22:14

Re: divergence detected in AMG solver
 
Usually this means your simulation is diverging, which can be caused by many reasons. Mesh quality, discretizing and numerical schemes, initialisation, and others.

Please recheck your simulation, and try again. If that doesn't help, you might want to start with a simpler case, and use this case as the initial condition for your actual case. You can also try to reduce your under relaxation factors.

Hope that helps.

azalina February 2, 2009 23:45

Re: divergence detected in AMG solver
 
0whhh...thank y0u f0r y0ur help..u're right..i'd reduced the URF n its w0rk..

jonbonraki September 20, 2012 14:33

even i have the same problem..what do you mean by URF??

NormalVector September 20, 2012 18:50

Quote:

Originally Posted by jonbonraki (Post 382830)
even i have the same problem..what do you mean by URF??

Under relaxation factors, try playing around with them.

jonbonraki September 20, 2012 19:57

Quote:

Originally Posted by NormalVector (Post 382865)
Under relaxation factors, try playing around with them.

thanks i did..and it worked


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