Hysteresis at low Reynolds number: the onset of 2D vortex shedding
V. K. Horvath, J. R. Cressman, W. I. Goldburg, X. L. Wu
Abstract
Hysteresis has been observed in a study of the transition between laminar flow and vortex shedding in a quasi-two dimensional system. The system is a vertical, rapidly flowing soap film which is penetrated by a rod oriented perpendicular to the film plane. Our experiments show that the transition from laminar flow to a periodic Kármán vortex street can be hysteretic, i.e. vortices can survive at velocities lower than the velocity needed to generate them.
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