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

What to do if particle tracking fails (overflow)

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 20, 2006, 03:21
Default What to do if particle tracking fails (overflow)
  #1
Felix
Guest
 
Posts: n/a
Hi,

I am simulating a particle flow (Lagrange) in gas and got the following error for particle source change rates "NaN" and "Fatal overflow in linear solver". The first 2000 iteration steps the simulation were computed without particles until I got a stable T-profile. Then I started the solver again with particle tracking (high resolution) and after about 160 iterations this error appeared. Has anybody an idea how to find the problem or what the problem could be?
  Reply With Quote

Old   October 20, 2006, 05:59
Default Re: What to do if particle tracking fails (overflo
  #2
Johnny
Guest
 
Posts: n/a
The solver crashed. Adjust your timestep, check your physics, check you mesh, etc., etc., etc.........
  Reply With Quote

Old   October 23, 2006, 02:05
Default Re: What to do if particle tracking fails (overflo
  #3
hdj
Guest
 
Posts: n/a
Check particle sources in out-file and try to change particle under relaxation factors.

hdj
  Reply With Quote

Old   October 23, 2006, 02:22
Default Re: What to do if particle tracking fails (overflo
  #4
Felix
Guest
 
Posts: n/a
Thank you, I will try that. For the last simulation I changed the blend factor to 0.75 instead of "high resolution", it was stable until now (about 800 iterations). I will let you know what happens when I change the relaxation factors.
  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
Blood Damage Modelling via Particle Tracking in a Centrifugal Heart Pump scatman CFX 5 May 5, 2011 07:23
massless particle tracking problem Renold FLUENT 0 January 26, 2011 15:23
Particle Tracking for ion Jun CFX 2 August 31, 2010 08:19
Number density tracking rather than particle tracking Rebecca Main CFD Forum 2 April 23, 2009 12:52
DPM UDF particle position using the macro P_POS(p)[i] dm2747 FLUENT 0 April 17, 2009 01:29


All times are GMT -4. The time now is 19:13.