Rolling vortex wave make air go around it, instead of over wing, no air over wingy means no air acting on wing. Vortex wall = high pressure creates a stagnation point with oncoming flow, just like a cylinder in a free stream of air would.
The vortex rotation also has an influence in how airflow goes around it. If the vortex is going clockwise then if the air is flowing from left to right the air will go over. If it's counter clockwise, the air will go under. Suppose you had a hovering vortex over the wing, and it's rotating CCW, the air sandwiched between the wing and the vortex will accelerate over the wing. The vortex and wing form a sort of ground effect.
Me like the way piezoelectric wing covering make vortex wave go away, like trout skin. Big mojo, strong medicine, kemo-bwana.
6-10hz seems to be the frequency at which the phenomena happens, so then it's a matter of tuning body work and suspension natural frequency, so that the heave/pitch motion cancels out waves in that frequency. That is if you can't use piezoelectric actuators, you have to work with what you can tune to simulate the behavior.
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