The ‘void’ structure in the wake of a self-oscillating flexible circular cylinder

The ‘void’ structure in the wake of a self-oscillating flexible circular cylinder 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. Experiments in Fluids Springer Journals

The ‘void’ structure in the wake of a self-oscillating flexible circular cylinder

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Copyright © 2009 by Springer-Verlag
Engineering; Engineering Thermodynamics, Heat and Mass Transfer; Fluid- and Aerodynamics; Engineering Fluid Dynamics
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