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

RMS velocity

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 26, 2006, 03:40
Default RMS velocity
  #1
user
Guest
 
Posts: n/a
hello everybody

Is it possible to get the value Root mean Square(RMS ) velocity of fluid in CFX post

please help me

with regards user

  Reply With Quote

Old   February 26, 2006, 03:54
Default Re: RMS velocity
  #2
TB
Guest
 
Posts: n/a
Are you talking about steady- or transient-flow? Try giving a bit more details here...
  Reply With Quote

Old   February 26, 2006, 08:26
Default Re: RMS velocity
  #3
user
Guest
 
Posts: n/a
hello thanks for replying i am talking abt transient flow i want to get the value of the normal and shear stress, for that i am trying to get root mean squre velocity

with regards user
  Reply With Quote

Old   February 27, 2006, 12:37
Default Re: RMS velocity
  #4
Robin
Guest
 
Posts: n/a
Just enter an expression for the root mean square. For any variable, say Phi

RMS Phi = sqrt(sum(Phi^2))

Simple.
  Reply With Quote

Old   February 27, 2006, 19:52
Default Re: RMS velocity
  #5
Eike
Guest
 
Posts: n/a
Hi An other way to get the RMS is to include a transient statistic. You can do this on the output control panel. regards eike
  Reply With Quote

Old   February 27, 2006, 22:15
Default Re: RMS velocity
  #6
Robin
Guest
 
Posts: n/a
Sorry, missed the fact that this was transient. Disregard my suggestion. Eike has the right idea.

-Robin
  Reply With Quote

Old   February 27, 2006, 22:54
Default Re: RMS velocity
  #7
TB
Guest
 
Posts: n/a
Eike is right. If you have already run the solver, consider output the variable vs time and calculate rms value manually in Excel or Matlab or any other software that may suit you. You can also write a small program using command window if you know how.
  Reply With Quote

Old   February 28, 2006, 03:19
Default Re: RMS velocity
  #8
user
Guest
 
Posts: n/a
hello Robin,Elike and TB

thanks for taking more effort let me know how do i include RMS in output control panel i thing i have to include the Root mean square option in trantient statics is it correct or not

please help me

user
  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
Emergency:UDF for a time dependent parabolic velocity zumaqiong Fluent UDF and Scheme Programming 12 March 25, 2010 12:00
RMS velocity by DES or LES? liweif FLUENT 0 September 20, 2007 04:43
rms velocity plots David FLUENT 1 November 8, 2006 10:35
Neumann pressure BC and velocity field Antech Main CFD Forum 0 April 25, 2006 02:15
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 09:11


All times are GMT -4. The time now is 17:31.