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

UDF and AMG solver crash

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 23, 2005, 18:07
Default UDF and AMG solver crash
  #1
Josef
Guest
 
Posts: n/a
Please, could you help me with a boring problem. I'm using UDF for modeling chemical reaction in porous media. It's a tube reactor with catalytic layer where the reaction occurs. I have to use UDF, becasue there is no way how to do that directly in Fluent, or is there? And when I use my UDF (source terms) it always stops with this message: Error: divergence detected in AMG solver: species-1 Error Object: ()

Does anybody know what is it? Or what can cause this problem? Thank you very much, I cannot overcome this problem. Or if you have better solution how to solve this system I will appreciate your help.

Josef
  Reply With Quote

Old   August 25, 2005, 07:19
Default Re: UDF and AMG solver crash
  #2
Luc
Guest
 
Posts: n/a
I have the same problem for a similar process. "Error: divergence detected in AMG solver: species-1" might mean that your source term is too high and that provokes thus unrealistic species mass fraction. As a result the case can not converged. There are two ways to overcome this. First decrease the under relaxation factor of the reacting species. If not sufficient, you can perform some test to identify the part of your udf which causes problem. Set the source term to a constant value then to the correct/10000 to see if the divergence comes really from a too high source term.

Luc
  Reply With Quote

Old   August 25, 2005, 08:07
Default Re: UDF and AMG solver crash
  #3
Josef
Guest
 
Posts: n/a
Luc, thank you I will try it.

  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 selvaganesh FLUENT 5 February 5, 2014 04:55
Divergence detected in AMG solver: pressure correction emlejeen FLUENT 4 August 7, 2010 06:45
divergence in AMG solver Merinadica FLUENT 0 December 5, 2006 09:17
Divergence in AMG solver: species-4 BillChen FLUENT 1 July 15, 2006 01:14
AMG solver error Matthew Brannock FLUENT 1 July 13, 2001 18:32


All times are GMT -4. The time now is 19:12.