Abstract
Flow-induced vibration of a circular cylinder (diameter D) submerged in the wake of a fixed circular cylinder of smaller diameter d is investigated. The cylinder was spring mounted, allowed to vibrate in the transverse direction only. While d is varied from 0.2D to 1.0D, cylinder spacing L systematically is changed from 1.0 to 5.5, where L is the distance between the forward stagnation point of the downstream cylinder to the center of the upstream cylinder. Measurements of vibration amplitude, lift force and flow field are carried out. A map of vibration regime is provided showing how the vibration of the cylinder is dependent on d and L. At a smaller d, vibration occurs for a longer range of L. The vibration is excited by the two shear layers reattaching alternately on the downstream cylinder. An increase in vibration amplitude is accompanied largely by an increase in lift amplitude.
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