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

Divergence detected in AMG solver

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 3, 2012, 17:47
Default Divergence detected in AMG solver
  #1
Member
 
Musango Lungu
Join Date: Dec 2011
Location: China
Posts: 73
Rep Power: 5
Musa is on a distinguished road
My simulation has broken down and i am receiving a message saying divergence detected in AMG solver:vof1-increasing relaxation sweeps. Anyone help me
Musa is offline   Reply With Quote

Old   March 4, 2012, 06:47
Default
  #2
Senior Member
 
Join Date: Mar 2011
Location: Germany
Posts: 414
Rep Power: 11
cfd seeker is on a distinguished road
Mate reduce the courant no and also the under relaxation factors at the start of simulation, once your solution gets stabilized then increase the courant no. The low the courant no. the more your solution will be stabilized but solution will take longer time to converge and vice-versa
cfd seeker is offline   Reply With Quote

Old   March 4, 2012, 10:15
Default
  #3
Member
 
Musango Lungu
Join Date: Dec 2011
Location: China
Posts: 73
Rep Power: 5
Musa is on a distinguished road
cfd seeker thanx for your suggestion but i am using the implicit solution so the courant number is not applicable and yes i have tried to reduce the under relaxation factors but it has not of much help.
Musa is offline   Reply With Quote

Old   March 4, 2012, 13:40
Default
  #4
Senior Member
 
Join Date: Mar 2011
Location: Germany
Posts: 414
Rep Power: 11
cfd seeker is on a distinguished road
Implicit scheme is very very unstable and has very strict conditions on the time step size. Courant no can be changed in the implicit scheme also. Its default value is 1 and you can reduce it.
cfd seeker is offline   Reply With Quote

Reply

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
Quarter Burner mesh with periosic condition SamCanuck FLUENT 2 August 31, 2011 11:34
ERROR: divergence detected in AMG solver black mamba Main CFD Forum 0 April 19, 2010 15:15
divergence detected in AMG solver !!! yansheng FLUENT 0 September 27, 2007 11:22
DIVERGENCE detected in AMG solver ENTHALPY MANOJKUMAR FLUENT 2 December 25, 2005 10:54
divergence detected in AMG solver: Shekhar Jain FLUENT 1 September 18, 2003 09:31


All times are GMT -4. The time now is 07:27.