  Flapping and revolving wings can produce attached leading edge vortices
(LEVs) when the angle of attack is large. In this work, a low order model is
proposed for the edge vortices that develop on a revolving plate at 90 degrees
angle of attack which is the simplest limiting case, yet showing remarkable
similarity with the generally known LEVs. The problem is solved analytically,
providing short closed-form expressions for the circulation and the position of
the vortex. A good agreement with the numerical solution of the Navier-Stokes
equations suggests that, for the conditions examined, the vorticity production
at the sharp edge and its subsequent three-dimensional transport are the main
effects that shape the edge vortex.
