This picture from the Dryden Water Tunnel shows the 3d rotational separation at the trailing edge of the wing, which is a central aspect of the New Theory of Flight, as illustrated in the following generic image:
We see the dye injected on top of the wing follow a streamline along the surface without rotation until the trailing edge where counter-rotating rolls are formed as in the following Navier-Stokes simulation of the flow around a circular cylinder displaying 3d rotational separation:
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