Abstract

The agility of the humpback whale has been attributed to the leading edge protuberances of its pectoral flippers. Previous studies have shown that the wavy leading edge of a static wing can enhance hydrodynamic performance by increasing lift and delaying stall, but the performance of wavy leading edge in dynamic stall is still not clear. The objective of present study is to elucidate the flow control mechanism of the wavy leading edge in dynamical stall by solving the Unsteady Reynolds Averaged Navier-Stokes (URANS) equations. The results show that the wavy leading edge has positive effects on the performance at high angle attacks in deep stall while negative effects in light stall, and no distinctive stall is observed during the flapping motion.

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