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

plot formula for post processing

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 7, 2010, 13:12
Default plot formula for post processing
  #1
New Member
 
Francisca
Join Date: Jun 2009
Posts: 14
Rep Power: 17
fjalil is on a distinguished road
Hi,

I guess this is somwhere around the documentation I'm running against time, so I wanted to ask if anybody knows how to do this. I have to plot a fórmula along my domain in post processing.

The formula is

I=\sqrt{0.5(u'^2+v'^2+w'^2)}/U

Does anyone know the CEL names for these variables (u', v', w', U)?

I would really appreciate if someone could help me.

Francisca Jalil
fjalil is offline   Reply With Quote

Old   July 7, 2010, 20:09
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,854
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
You will have to define them as a variable in CFD-Post. If you used a two equation turbulence model then u', v' and w' will all be equal, and given by u'=sqrt(2*k/3) (see http://www.cfd-online.com/Wiki/Turbulence_intensity). If you used RSM they can be different, look up a turbulence textbook for the equations for that one.

If you used LES then are you talking about the resolved eddies or the sub-grid turbulence?
ghorrocks is offline   Reply With Quote

Old   July 7, 2010, 22:05
Default Thanks!
  #3
New Member
 
Francisca
Join Date: Jun 2009
Posts: 14
Rep Power: 17
fjalil is on a distinguished road
Thank you Glenn. I'm using a two equation turbulence model, so I guess it's the easy way. Thanks again!!

Francisca
fjalil is offline   Reply With Quote

Old   July 8, 2010, 09:34
Default
  #4
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,854
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
Quote:
I'm using a two equation turbulence model, so I guess it's the easy way.
If you are using a 2-eqn model then it is the only way. There is no other way.
ghorrocks is offline   Reply With Quote

Reply

Tags
cel expression, formulation


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
2D plot post processing hari FLUENT 0 October 22, 2007 01:20
Post Processing in FEM Abhijit Tilak Main CFD Forum 0 April 26, 2004 12:59
Post processing Ashish Joshi Siemens 1 March 22, 2004 00:42
graph plot anindya Main CFD Forum 2 September 17, 2003 13:00
Post Processing difficulties Ashish Siemens 0 August 21, 2003 21:19


All times are GMT -4. The time now is 03:09.