Abstract
A method for predicting the relative stability of leading-edge vortices (LEVs) on flapping profiles is proposed and validated experimentally with time-resolved Particle Image Velocimetry and three-dimensional Particle Tracking Velocimetry. LEV stability is predicted by estimating the growth of an LEV from the relative strength of vorticity feeding, vorticity convection, and vortex stretching for a given limiting vortex size. The proposed method accurately predicts relative LEV stability. In particular, more stable LEVs are observed at higher reduced frequencies, which represent the ratio between the limiting vortex size and the rate of vorticity feeding. The introduction of profile sweep increased both LEV stability and spanwise vorticity transport. It is thought that spanwise vorticity transport improved LEV stability by acting as a sink for vorticity generated in the leading-edge shear layer.
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