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Vortex Induced Oscillations of Cylinders

Author
Camassa, Roberto; Chung, Bong Jae; Gipson, Greg; McLaughlin, Richard; Vaidya, Ashwin
Abstract
This video shows the orientational behavior of a hinged cylinder suspended in a water tunnel with Reynolds number (Re) ranging between 100-6000 and reduced inertia (I*) in the range 0.1-0.6. The
cylinder displays unique features, such as: steady orientation, periodic oscillations and autorotation. We illustrate these features using a phase diagram which captures the observed phenomena as a function of Re and I*. A hydrogen bubble flow visualization technique is employed to show vortex shedding structure in
the cylinder?s wake which results in these oscillations.
Sponsorship
RTG NSF DMS-0502266
Date Issued
2008-10-10Subject
vortex shedding; autorotation
Type
video/moving image