CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

Jump in Residuals

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

LinkBack Thread Tools Display Modes
Old   March 1, 2011, 18:30
Default Jump in Residuals
New Member
Ryan Z. Davis
Join Date: Mar 2010
Location: Idaho Falls, Idaho, United States
Posts: 11
Rep Power: 9
ryzd is on a distinguished road
Hi all,

I am using FLUENT to run a 2-D laminar natural convection problem. While I was running the simulation I noticed a couple of strange jumps in the residuals after about 14000 iterations and again after about 17500 iterations. The residuals return to where they were after a few iteration, but I was wondering if anyone knows why it would do this.

P.S. I'm trying to attach a picture to show a plot of the residuals.

Attached Images
File Type: jpg Untitled.jpg (40.0 KB, 29 views)
ryzd is offline   Reply With Quote

Old   March 1, 2011, 22:39
Senior Member
Join Date: Nov 2009
Posts: 411
Rep Power: 13
DoHander is on a distinguished road
Judging after your residuals your solution is converged, the oscillations between 1e-08 and 1e-10 probably means you are at the limit of your machine precision, I think they are not looking strange.

If I'm wrong please correct me,

DoHander is offline   Reply With Quote


fluent, natural convection, residuals

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
[Tutorials] Tutorial of how to plot residuals ! wolle1982 OpenFOAM Community Contributions 149 December 13, 2017 04:40
what to monitor besides residuals? franzdrs FLUENT 5 March 21, 2013 04:59
Convergence - scaled vs unscaled residuals HS FLUENT 1 November 7, 2005 06:45
Jump in residuals under Linux mAx FLUENT 8 July 12, 2005 09:55
Fluent Parallel/Serial version..jump in residuals Sandeep Abhyankar FLUENT 4 January 10, 2000 10:57

All times are GMT -4. The time now is 00:17.