CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

AMG solver _divergence detected

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 10, 2009, 13:12
Default AMG solver _divergence detected
  #1
Shamoon
Guest
 
Posts: n/a
Hi guys

I am simulating a problem with 0.3 M mesh size and density based solver with k epsilon model. When I ran 50 iterations the solution diverged displaying the message

Divergence detected AMG solver -temperature. Can anybody tell me what to do?

Regards
  Reply With Quote

Old   March 10, 2009, 13:24
Default Re: AMG solver _divergence detected
  #2
Ash
Guest
 
Posts: n/a
hey i have suffered from this problem several times if there is some problem in grid,may be you can try to run laminar problem with present grid first, reply if you solve the problem
  Reply With Quote

Old   March 10, 2009, 14:00
Default Re: AMG solver _divergence detected
  #3
Shamoon
Guest
 
Posts: n/a
We cant try to run on laminar because we have to use the turbulence model from the beginning. Its an assignment and we have ad edline on Friday
  Reply With Quote

Old   March 10, 2009, 16:30
Default Re: AMG solver _divergence detected
  #4
Laci
Guest
 
Posts: n/a
Stop the calculation at the ~40th step, nad 'Adopt' the grid. Sometimes it helps. Let us know, if it works please.
  Reply With Quote

Old   March 10, 2009, 18:39
Default Re: AMG solver _divergence detected
  #5
Shamoon
Guest
 
Posts: n/a
adapt the grid? but with respect to which gradient?
  Reply With Quote

Old   March 11, 2009, 01:18
Default Re: AMG solver _divergence detected
  #6
Mandar
Guest
 
Posts: n/a
what i wanted to you was that "c whether grid is fine if it isnt, right laminar model will also fail and you can look into geometry part of it instead of focussing on turbulence model "
  Reply With Quote

Old   March 11, 2009, 08:59
Default Re: AMG solver _divergence detected
  #7
Laci
Guest
 
Posts: n/a
First, I would try with temperature, than velocity.
  Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
divergence detected in AMG solver !!! yansheng FLUENT 0 September 27, 2007 12:22
divergence detected in AMG solver. Babu FLUENT 3 March 4, 2005 04:08
divergence detected in AMG solver: Shekhar Jain FLUENT 1 September 18, 2003 10:31
HELP! divergence detected in AMG solver ann FLUENT 3 January 4, 2003 02:27
Divergence detected in AMG solver? varghese FLUENT 5 May 27, 2002 08:50


All times are GMT -4. The time now is 03:33.