|May 14, 2010, 13:44||
Help on induced drag in VLM
Join Date: May 2010
Posts: 1Rep Power: 0
I am doing analysis of ocean current turbine using vlm. i computed lift force and Can anyone please let me know how to calculate the induced drag (or any reference).
|August 25, 2010, 05:07||
Join Date: Jul 2010
Location: Córdoba, Argentina
Posts: 21Rep Power: 8
If you where able to calculate lift force then induce drag is pretty much the same. I suppose you calculated the force on each panel by:
Fi=gammai*rho*V*bi (Kutta's formula)
Now, as Fi is a force it has three components in x,y,z respectively, usually in body axes. So:
Then to convert those total components to wind axes simply apply a rotation matrix (Euler angles) which depends on attack and yaw angles solely:
Di is induced drag, C is lateral force and L is lift. To obtain coefficients divide each of them by q*S.
If you're not happy with my answer, you can check the books by Jack Moran (provides sample VLM code) or the good ol' Katz & Plotkin. You can also check the source code of Tornado, AVL, VLMpc or VorStab, they are all open source VLM codes, and reliable.
|cdi, induced drag, vlm|
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