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

Angle of Attack (AoA) adjustment for 2D / 3D

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 10, 2010, 09:21
Question Angle of Attack (AoA) adjustment for 2D / 3D
  #1
New Member
 
Mitch Greenberg
Join Date: May 2010
Posts: 1
Rep Power: 0
FractureProof is on a distinguished road
Hi, I have about 20 years of structural / stress analysis experience, however I am just diving into some CFD research to create a realistic aircraft to base a training course around.

I have gone through some simple tutorials for using FLUENT from Cornell:

http://courses.cit.cornell.edu/fluent/airfoil/step4.htm

In which, the objectiv eis to model a 2D NACA airfoil section at 2 deg AOA. In the process, it states "(Note that 1.2° is used as our angle of attack instead of 2° to adjust for the error caused by assuming the airfoil to be 2D instead of 3D.)"

I imagine this is maybe due to vortex shedding.. but I'm just guessing... Can someone detail this requirement and provide link to allow me to calculate this adjustment for arbitrary AoA. Thx.
FractureProof is offline   Reply With Quote

Old   May 10, 2010, 09:39
Default
  #2
agd
Senior Member
 
Join Date: Jul 2009
Posts: 350
Rep Power: 18
agd is on a distinguished road
If I remember correctly, it is actually due to the fact that in a 2D simulation, there is no third dimension for the flow to move in. In 3 dimensions the angle of attack has to be slightly higher to get the same effective momentum change for lift because some of the flow can move out along the wings. John Anderson has a good basic Aero book (whose title escapes me now). Katz and Plotkin also have a good book on low speed airfoil theory, but again the title escapes me and I am at work while my books are at home. You could also try googling low speed airfoil theory or potential theory for airfoils.
agd is offline   Reply With Quote

Reply

Tags
adjustment, angle of attack, aoa

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
[Netgen] Import netgen mesh to OpenFOAM hsieh OpenFOAM Meshing & Mesh Conversion 32 September 13, 2011 06:50
introducing angle of attack on ICEMCFD HEXA icem beginner CFX 2 December 24, 2008 12:00
introducing angle of attack on ICEMCFD HEXA icem beginner FLUENT 2 December 6, 2008 16:34
angle of attack with icem hexa icem beginner Main CFD Forum 0 December 5, 2008 17:54
angle of attack kiran FLUENT 0 September 10, 2004 09:18


All times are GMT -4. The time now is 17:22.