using AVL; vortex lattice method from Drela.

Discussion in 'Software' started by nico, Aug 22, 2010.

  1. nico
    Joined: Jan 2003
    Posts: 190
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    Location: SF

    nico Senior Member


    I am using AVL (see a vortex lattice method (and more) written by Drela and Youngren.
    Wonderful program, but I am struggling a bit on a particular point; from the spanwise load, I would like to go switch to Xfoil to look at section design. Problem is how to get the effective angle of attack of the foil? (angle_eff = angle_inf - angle_induced)

    AVL outputs the downwash angle along the span, which I think is the induced angle, sounds great but;

    for me induced angle (along the span) can also be found from
    1) atan(CDi/CL)
    2) alfa_ind=alfa_inf - CDi/2pi

    so then if I compare those 3 ways, I get different answers...
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