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

RMS fluctuation

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 8, 2013, 11:44
Default RMS fluctuation
  #1
New Member
 
saeed
Join Date: Apr 2013
Posts: 4
Rep Power: 3
saeedabedi is on a distinguished road
Hi all

I am attempting to simulate flow over a submnarine at a constant speed.

I am using ANSYS CFX, k omega or SST turbulence model, A structured mesh with icem.

When I have coarse mesh it solves and RMS residual converges however when I have fne mesh RMS residual will not converge and there is fluctuation in RMS.


Can anyone offer some advice from previous expeience?



Cheers,

Saeed
saeedabedi is offline   Reply With Quote

Old   April 8, 2013, 19:22
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 9,961
Rep Power: 78
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
Here's plenty of advice: http://www.cfd-online.com/Wiki/Ansys...gence_criteria

Your comments agree with the expected behaviour described in this FAQ.
ghorrocks is offline   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
how to calculate rms velocity fluctuation after runtime nati OpenFOAM Post-Processing 6 February 7, 2013 09:42
RMS P-mass no-convergence for low pressure ration,low rotor speed turbine Ton CFX 3 November 6, 2010 08:21
RMS Res. is the smaller the best? Anderson T F CFX 10 September 12, 2007 06:59
Urgent help: RMS problem!!! Anh CFX 4 September 8, 2007 14:47
What's wrong with my RMS profile in LES Jiang Ning FLUENT 0 March 31, 2005 05:30


All times are GMT -4. The time now is 00:24.