CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Error: Divergence detected in AMG solver

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

LinkBack Thread Tools Display Modes
Old   November 15, 2015, 04:01
Default Error: Divergence detected in AMG solver
New Member
Join Date: Nov 2015
Posts: 2
Rep Power: 0
Masroor is on a distinguished road
I need to discuss a matter that I faced while simulating a multiphase system using different multiphase and turbulence models. In all the cases I kept the operating conditions and under relaxation factors similar. I got corrected results without any error using eulerian model with k-epsilon standard, k-omega standard models while the case including same multiphase model but RS turbulence model yielded an error "Error: Divergence detected in AMG solver: epsilon" with a notification in text user interface which is "turbulent viscosity limited to viscosity ratio of 1.0 e+05 in xxxxx cells".
Kindly provide any any solution for above mentioned
Masroor is offline   Reply With Quote

Old   November 16, 2015, 11:50
Senior Member
Lucky Tran
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 1,886
Rep Power: 26
LuckyTran will become famous soon enoughLuckyTran will become famous soon enough
Two things are going on here. The first is that your solution diverged, it's as simple as that. The RSM model is notoriously difficult to get a converged solution because it is very sensitive. You should investigate whether it converged because of a bad initial guess or if there is another numerical issue that is causing the issue (skewed cells in mesh for example). You may be able to proceed using reduced urf's.

Turbulent viscosity being limited means that your turbulence model is predicting highly non-physical results, and this can be a result of a bad initial guess. For example, if you didn't properly initialize all the Reynolds stresses & k & epsilon you could easily end up with this error.
LuckyTran 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
Error: Divergence detected in AMG solver: pressure correction wanna88 FLUENT 19 April 6, 2016 02:57
Divergence detected in AMG solver: ads-0 Patrino FLUENT 5 November 25, 2015 10:04
Fluidized Bed: Error: Divergence detected in AMG solver: pressure correction Error Ob Mole89 FLUENT 5 April 12, 2014 09:32
Error: Divergence detected in AMG solver: x-momentum/ epsilon/ temperature bubuchacha FLUENT 6 February 26, 2013 04:30
AMG solver _divergence detected Shamoon FLUENT 6 March 11, 2009 08:59

All times are GMT -4. The time now is 23:58.