The ‘void’ structure in the wake of a self-oscillating flexible circular cylinder |
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Authors: | Stuart Gilbert Lorenz Sigurdson |
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Institution: | (1) Vortex Fluid Dynamics Lab, University of Alberta, Edmonton, AB, Canada; |
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Abstract: | We discuss the experimental vortex wake of a flexible circular cylinder undergoing vortex-induced vibration at low Reynolds
number and a large cylinder aspect ratio. Hydrogen bubbles formed on the cylinder track the von Karman vortex cores. They
show a characteristic ‘void’ structure. We propose a vortex skeleton model that includes a pinch-off of opposite-signed cores.
Voids occurred at a node in streamwise vibration when close to an antinode in transverse cylinder vibration. A vibration model
predicts the ratio of shedding frequency to natural cylinder vibration frequency necessary for void formation at specific
spanwise locations. |
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