|May 10, 2010, 08:21||
Angle of Attack (AoA) adjustment for 2D / 3D
Join Date: May 2010
Posts: 1Rep Power: 0
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:
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.
|May 10, 2010, 08:39||
Join Date: Jul 2009
Posts: 240Rep Power: 11
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.
|adjustment, angle of attack, aoa|
|Thread||Thread Starter||Forum||Replies||Last Post|
|Import netgen mesh to OpenFOAM||hsieh||Open Source Meshers: Gmsh, Netgen, CGNS, ...||32||September 13, 2011 05:50|
|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 08:18|