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

Wing Lift and drag coefficient

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

Like Tree1Likes
  • 1 Post By ghorrocks

Reply
 
LinkBack Thread Tools Display Modes
Old   April 15, 2012, 07:13
Default Wing Lift and drag coefficient
  #1
New Member
 
Thierry Chavagnan
Join Date: Apr 2012
Posts: 6
Rep Power: 5
thiez03 is on a distinguished road
Hi everyone!!!

I am trying to calculate the lift and drag coefficient of a 3D wing in CFX. I know CFX offers viscous force in X, Y and Z direction.

My flow is aligned with the the x-axis. Therefore, am I right saying that I can use the force in the x-axis to obtain Cd and the force on the y-axis can be used to obtain Cl ??!!

Thank you for your consideration.
thiez03 is offline   Reply With Quote

Old   April 15, 2012, 17:51
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,646
Rep Power: 84
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
Quote:
I know CFX offers viscous force in X, Y and Z direction.
No, CFX gives the total force in X/Y/Z directions. It does not calculate viscous forces separately. But you may be able to calculate it from integrals of wall shear stress.

Your question is correct. This is the standard definition for Cd and Cl.
thiez03 likes this.
ghorrocks is offline   Reply With Quote

Old   April 16, 2012, 09:26
Default
  #3
New Member
 
Thierry Chavagnan
Join Date: Apr 2012
Posts: 6
Rep Power: 5
thiez03 is on a distinguished road
Thank you so much!!

So basically the force in x-axis is also the drag force (skin friction + form drag etc.) and the y-axis is the amount of lift force produced by the wing.

From these forces I just have to work out, the Cl and Cd.

Thank you once more for your time

Kind Regards
thiez03 is offline   Reply With Quote

Old   April 17, 2012, 01:18
Default
  #4
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,646
Rep Power: 84
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
That's right. force_x/y/z is the total force in that direction.
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
lift & drag coefficient on airfoil n. natik FLUENT 8 March 31, 2015 19:02
Reference Area for Calculating Lift and Drag Coefficient of 3D wing mahbub03 Main CFD Forum 3 May 19, 2011 00:21
Automotive test case vinz OpenFOAM Running, Solving & CFD 98 October 27, 2008 09:43
Lift and Drag on airplane wing Arj CFX 4 October 6, 2006 04:05
drag and lift coefficient No CD-adapco 5 July 13, 2004 10:21


All times are GMT -4. The time now is 13:33.