Interaction of vortex breakdown with an oscillating fin

Reference:

Gursul, I. and Xie, W., 2001. Interaction of vortex breakdown with an oscillating fin. AIAA Journal, 39 (3), pp. 438-446.

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Abstract

The interaction of vortex breakdown with an oscillating fin was investigated by flow visualization and velocity measurements to understand the effects of aeroelastic deflections on fin buffeting. For frequencies lower than a cutoff frequency the response of vortex breakdown location is quasi periodic, and the amplitude of the variations of breakdown location decreases with increasing frequency. For frequencies higher than the cutoff frequency, vortex breakdown does not respond to the fin oscillations. These observations suggest that the dynamic response of breakdown location to an oscillating fin is similar to that of a low-pass filter. For different locations of the fin with respect to the vortex, similar amplitude responses were found. This result can be used in the design of fins to prevent a feedback effect and coupling between the vortex breakdown and fin structure. A theoretical explanation of the experimental observations based on the wave propagation characteristics of the vortex flows is presented.

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