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

error problems between experimental and numerical study

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 13, 2010, 10:50
Default error problems between experimental and numerical study
  #1
New Member
 
ok
Join Date: Jun 2010
Posts: 2
Rep Power: 0
d118i is on a distinguished road
Hello,

i am a spanish man that are doing an aerodynamic study of a motorsport spoiler. I had done a numerical simulation with star ccm+ and now i am taking some information with this spoilers in a wind tunnel. My project tutor/teacher said me that the cfd can be until 20% of error (more or less) between the cfd mesurements and the mesures of wind tunnel. I don't understand because my mesurements in wind tunnel are ok with Drag component but not with Lift component (Downforce).

For example: with 0 degrees inclination the cfd study shows 38,33 N of Downforce and 8,84 N of Drag and the wind tunnel measures are 22,5 N of Downforce and 7,1 N of Drag. If I applicate the teacher's theorem, the drag are in the 20% of error. 7,1 + (20% of 8,84 = 1,77) = 8,87 N but if I do the same with the Downforce the result is not valid with this theory.

Someone know if is true that's the maximum error between cfd and experimental study are 20% or can be more?? What can I do?

Thanks,

david.
d118i 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
experimental or numerical data channel FELIPE Main CFD Forum 8 February 8, 2011 04:02
error problems between experimental and numerical study d118i CD-adapco 4 June 18, 2010 12:45
HELP! Experimental & numerical results don't agree Jenny Rollo FLUENT 5 April 23, 2006 14:12
Circular miniFlume experimental amp numerical results amelia OpenFOAM Running, Solving & CFD 11 September 4, 2005 22:42
Experimental & numerical results Amy CFX 2 September 1, 2005 08:52


All times are GMT -4. The time now is 23:11.