Abstract
An experimental investigation has been conducted into vortex-induced, cross-flow oscillations of a circular cylinder mounted elastically in a water channel. The Reynolds number ranged between 90 and 150, a regime where the vortex street is fully laminar. The frequency and amplitude of cylinder oscillation and the vortex-shedding frequency were measured in and around the lock-in region. Fluid velocities in the cylinder wake and cylinder response were recorded simultaneously at Re = 115 in the lock-in region, and traces of cylinder motion were taken in and around resonant conditions. The maximum oscillation amplitude occurs near the lower limit of the lock-in region, while no substantial differences in final response are detectable between the cylinder amplitude developing from rest and the free stream velocity being varied with the cylinder already oscillating. The cylinder oscillation frequency was found to be slightly higher than its natural frequency in air, in the greatest part of the lock-in region.
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