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

Transient case cannot convergence?

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 1, 2005, 03:26
Default Transient case cannot convergence?
  #1
Kevin
Guest
 
Posts: n/a
An transient problem cannot convergence.

What should I do next?

How to modify the model?
  Reply With Quote

Old   August 1, 2005, 15:52
Default Re: Transient case cannot convergence?
  #2
CHELSA
Guest
 
Posts: n/a
Hey Kevin,

I was under the impression that transient keeps changing with time : correct me if I am wrong. Is there any special case you are running? Can you explain the problem.

Regards
  Reply With Quote

Old   August 1, 2005, 22:41
Default Re: Transient case cannot convergence?
  #3
Kevin
Guest
 
Posts: n/a
Hello,CHELSA ,

There are two large scale box passing each other in this case. Box is 1m*0.4m*0.3m, is filleted .The velocity of the two box is respectively 50m/s and -50m/s. It is versy simple ,but convergence is difficulty to arrive.

I changed the delta time ,but it still divergenced.I 'am confused for the case,what should i do next?
  Reply With Quote

Old   August 1, 2005, 23:29
Default Re: Transient case cannot convergence?
  #4
som
Guest
 
Posts: n/a
Is it cell activation and deactivation?
  Reply With Quote

Old   August 2, 2005, 17:48
Default Re: Transient case cannot convergence?
  #5
CHELSA
Guest
 
Posts: n/a
Hey Kevin,

Looks like it is a case of large tolerences. How much did you give? Try something like 0.001 or closer and also are your momentum equations converging?
  Reply With Quote

Old   August 3, 2005, 08:35
Default Re: Transient case cannot convergence?
  #6
Kevin
Guest
 
Posts: n/a
To Som yes,just as you said.

To Chelsa

Thanks ,I will try again!
  Reply With Quote

Reply


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
How to show the transient case? H.P.LIU Phoenics 7 July 13, 2010 05:31
Transient Case MAB CFX 7 August 13, 2008 08:52
Convergence in transient case Hamodi Siemens 3 February 1, 2007 05:10
Residuals for transient case suti FLUENT 0 September 30, 2005 05:31
UDF about transient case Jason FLUENT 1 May 12, 2004 06:05


All times are GMT -4. The time now is 15:48.