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

Difference between scaled residuals and...

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 28, 2006, 18:52
Default Difference between scaled residuals and...
  #1
Dieter
Guest
 
Posts: n/a
What is the difference between scaled and default normalized residuals?

For the segregated solver: I don't see the difference between formula 26.19-6 and 26.19-7. This are the two formulas for the segregated scaled and normalized residuals in de users guide of Fluent.

But under formula 26.19-6 there is written: "It is sometimes useful to determine how much a residual has decreased during calculations as an additional measure of convergence. For this purpose, Fluent allows you to normalize..."

From these lines in de users guide I understand that there is a difference but I don't see it from the formulas. And when I'm postprocessing my data (unsteady calculation) in the Fluent I don't see any change when I'm changing scaled to normalised and push the plot button.

In formula 26-19-8 they give the definition for the residual of the coupled solver to which time are they differentiating ? For the coupled solver residual I also have the same question what is the difference between scaled an normalized residual? Under formula 26.19-10 there is written: "By default M=5 , making the normalized residual equivalent to the scaled residual." So very strange for me.

Thank you very much for your attention and help.

Dieter

  Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Force can not converge colopolo CFX 13 October 4, 2011 23:03
Erratic Scaled Residuals mr_stoked FLUENT 0 August 25, 2010 04:50
Is it possible to use normalized continuity residual + scaled other residuals? ivanbuz FLUENT 0 April 25, 2010 21:07
Convergence - scaled vs unscaled residuals HS FLUENT 1 November 7, 2005 06:45
Scaled residuals Raja Siemens 1 May 31, 2001 05:13


All times are GMT -4. The time now is 05:47.