Universal scaling law in drag-to-thrust wake transition of flapping foils

24 Apr 2019 Lagopoulos N. S. Weymouth G. D. Ganapathisubramani B.

Reversed von K\'arm\'an streets are responsible for a velocity surplus in the wake of flapping foils, indicating the onset of thrust generation. However, the wake pattern cannot be predicted based solely on the flapping peak-to-peak amplitude $A$ and frequency $f$ because the transition also depends sensitively on other details of the kinematics... (read more)

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