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

difference of velocity field processed by CFD-POST and Fluent

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 15, 2010, 04:28
Default difference of velocity field processed by CFD-POST and Fluent
  #1
Member
 
Dongzi Wei
Join Date: Mar 2009
Posts: 33
Rep Power: 17
Jiuan is on a distinguished road
Dear All,

I used both CFD-POST and Fluent post-processing tool to show the velocity vector in a certain surface. The velocity magnitude by these two tools are different. Why? And how to fix the difference? How can get the same result by CFD-POST as the one by Fluent post-processing tool? Thanks.
Jiuan is offline   Reply With Quote

Old   June 15, 2010, 07:51
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
CFX and Fluent use different control volumes and therefore Fluent is probably doing some interpolation onto different control volumes when it displays CFX data. Either that or CFX does not correctly show the hybrid/conservative variable issue correctly. Either way CFD-Post is the correct one and has been designed to correctly show CFX results.
ghorrocks is offline   Reply With Quote

Old   June 16, 2010, 02:52
Default
  #3
Member
 
Dongzi Wei
Join Date: Mar 2009
Posts: 33
Rep Power: 17
Jiuan is on a distinguished road
Thanks.

I get the simulation result by Fluent. In this case, is Fluent itself post-processing tool is better to show the result?
Jiuan is offline   Reply With Quote

Old   June 16, 2010, 09:23
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
If the simulation was done in Fluent then CFD-Post has to do some interpolations onto CFX control volumes. In this case the Fluent post-processor is the one to benchmark off. But the differences should be very small.
ghorrocks is offline   Reply With Quote

Reply


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
FLUENT bug in cartesian-cylind velocity conversion Knut FLUENT 0 September 3, 2008 11:52
Axial, Radial, Tangental velocity in FLUENT post Barri FLUENT 2 March 6, 2008 21:29
Fluent -post Dan FLUENT 1 February 14, 2007 11:29
fluent for post processing James FLUENT 0 April 21, 2006 05:43
PC vs. Workstation Tim Franke Main CFD Forum 5 September 29, 1999 16:01


All times are GMT -4. The time now is 20:27.