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

Calculating forces from wings..

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 22, 2010, 02:31
Default Calculating forces from wings..
  #1
New Member
 
Join Date: Jan 2010
Posts: 4
Rep Power: 16
cjarrett is on a distinguished road
Please excuse my ignorance but I have a basic question to ask. I've began using CFDesign to start testing some racecar aero properties and want to make sure I'm doing things correctly.

I've got my wing model creating forces in CFDesign, which at 10 deg AoA is around 390 newtons. For planar area, I take the entire area of the wing chord surface and divide by 2, which is 0.528m squared. When I calculate my coefficient of lift I get 0.382 which is 390.027/1215 (dynamic pressure at 45m/s) x 0.528 which is my planform area.. is my calculation correct?

Also, is my measurement of the planform area correct, or should I take the exact dimensions of the wing from the top view when its at 10 degrees? Because the wing is angled away, it will be slightly smaller in area from that view..

Thanks for your patience..
cjarrett is offline   Reply With Quote

Old   January 22, 2010, 23:22
Default
  #2
Member
 
Skeptic
Join Date: Mar 2009
Posts: 67
Rep Power: 17
Lysistrata is on a distinguished road
Quote:
Originally Posted by cjarrett View Post
Please excuse my ignorance but I have a basic question to ask. I've began using CFDesign to start testing some racecar aero properties and want to make sure I'm doing things correctly.

I've got my wing model creating forces in CFDesign, which at 10 deg AoA is around 390 newtons. For planar area, I take the entire area of the wing chord surface and divide by 2, which is 0.528m squared. When I calculate my coefficient of lift I get 0.382 which is 390.027/1215 (dynamic pressure at 45m/s) x 0.528 which is my planform area.. is my calculation correct?
Since you don't know what you are doing, even at the most basic level, I would guess "No". You are just another schmuck who thinks that plugging a geometry into a CFD solver will magically produce results that have merit.
Sorry to disappoint.
Lysistrata is offline   Reply With Quote

Old   January 23, 2010, 15:40
Default
  #3
New Member
 
Join Date: Jan 2010
Posts: 4
Rep Power: 16
cjarrett is on a distinguished road
Thanks for your guess.. I assume you came out of the womb with a full understanding of CFD? I see you have nothing better to do on a Friday night so I will just ignore the post. Hopefully someone here is willing to help a beginner. As everyone has to start somewhere
cjarrett is offline   Reply With Quote

Old   January 23, 2010, 16:58
Default
  #4
Member
 
Skeptic
Join Date: Mar 2009
Posts: 67
Rep Power: 17
Lysistrata is on a distinguished road
Quote:
Originally Posted by cjarrett View Post
Thanks for your guess.. I assume you came out of the womb with a full understanding of CFD?
No, I didn't. But I did take the time to begin with non-CFD methods so I had an understanding of first principles.
Lysistrata is offline   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
Calculate forces without hydrostatic pressure geir_oye FLUENT 4 November 12, 2009 10:12
Problems in calculating the fluid traction on the current structure frame in 3D models fw407 OpenFOAM Running, Solving & CFD 0 August 6, 2008 13:04
Strange results from interFoam solution converges but sum of all forces not equal to zero nicasch OpenFOAM Running, Solving & CFD 0 April 15, 2008 03:01
How to update polyPatchbs localPoints liu OpenFOAM Running, Solving & CFD 6 December 30, 2005 18:27
Valve Forces in CFdesign Mike Clapp Main CFD Forum 3 March 8, 2001 15:09


All times are GMT -4. The time now is 07:50.