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

# Divergence detected in AMG solver: temperature -> Increasing relaxation sweeps!

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

Like Tree1Likes
  • 1 Post By Abhya

Reply
 
LinkBack Thread Tools Display Modes
Old   March 31, 2011, 15:00
Default # Divergence detected in AMG solver: temperature -> Increasing relaxation sweeps!
  #1
New Member
 
jenny
Join Date: Mar 2011
Posts: 1
Rep Power: 0
pastarox is on a distinguished road
Hi all,

I'm a novice at FLUENT, and i'm having trouble getting my solution to converge.

I'm trying to do a heat transfer analysis on a 3D mesh, and I keep getting this error:
# Divergence detected in AMG solver: temperature -> Increasing relaxation sweeps!

I've tried changing the URF and the limit of the temperature.

Any ideas?
pastarox is offline   Reply With Quote

Old   March 31, 2011, 15:12
Default
  #2
Senior Member
 
xrs333
Join Date: Aug 2010
Posts: 125
Rep Power: 7
xrs333 is on a distinguished road
try to reinitialize the solution, using more physical values, espacially for turbulent variables. you can check up turbulent viscosity ratio after initialization, it should not be too large.
xrs333 is offline   Reply With Quote

Old   March 21, 2013, 06:31
Exclamation dirvegen detected temperature
  #3
Member
 
Arun
Join Date: Mar 2012
Location: Vellore,TN,India
Posts: 35
Rep Power: 5
arunintn is on a distinguished road
Hi,
I have the same problem. The project is about super sonic flow over a surface. we have the Tu%= 0.1. the speed of M=1.4
the gauge pressure is = 771643.9

Errors :
when the solution initialized it shows:
turbulent viscous ratio limited in some cells
absolute pressure limited
temperature limited

can some one suggest me the solution.
arunintn is offline   Reply With Quote

Old   March 21, 2013, 08:56
Default
  #4
Member
 
Join Date: Jul 2012
Posts: 41
Rep Power: 5
Abhya is on a distinguished road
pastarox try :
solution controls -> advanced -> set cycle type to F cycle
.. Giving non physical source terms / boundary conditions may also cause it .. i had the same a coupe of times
nuvan likes this.
Abhya is offline   Reply With Quote

Old   March 23, 2013, 03:58
Default
  #5
Member
 
Arun
Join Date: Mar 2012
Location: Vellore,TN,India
Posts: 35
Rep Power: 5
arunintn is on a distinguished road
Abhya, Can you explain what is non physical scource tearm. The changed cycle type is F-cycle but not working.

Now i'm getting absolute pressure limited..

can some one direct me or tell me why i have the problem.
I checked my grid it look good too..
arunintn is offline   Reply With Quote

Old   March 23, 2013, 08:17
Default
  #6
Member
 
Join Date: Jul 2012
Posts: 41
Rep Power: 5
Abhya is on a distinguished road
Quote:
Originally Posted by arunintn View Post
Abhya, Can you explain what is non physical scource tearm. The changed cycle type is F-cycle but not working.

Now i'm getting absolute pressure limited..

can some one direct me or tell me why i have the problem.
I checked my grid it look good too..
unrealistic values ..
For example : I had a mass source term and an energy source term which depends on the mass source term as:
Energy source= (-mass source)*latent heat
I had forgotten the -ve sign earlier and this resulted in the error as yours...
Abhya 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
divergence detected in AMG solver azalina FLUENT 5 September 20, 2012 18:57
AMG solver _divergence detected Shamoon FLUENT 6 March 11, 2009 08:59
user subroutine error CFDUSER CFX 2 December 9, 2006 07:31
user defined function cfduser CFX 0 April 29, 2006 10:58
Divergence detected in AMG solver? varghese FLUENT 5 May 27, 2002 07:50


All times are GMT -4. The time now is 08:31.