Vortex-induced oscillation and lift of yawed circular cylinders in cross-flow

Abstract This paper presents the wind-tunnel test data for vortex-induced oscillations of yawed circular cylinders in cross-flow. The experiments were conducted on free oscillation models for yaw angles of θ =0,15,30 and 45°, and for different values of reduced damping or Scruton number. The structural damping was measured on each of the models. The test Reynolds number, in the subcritical region, ranged from 8×10 3 to 2×10 4 . The amplitude of oscillation and the amplitude and phase angle of fluctuating lift were measured with respect to the reduced velocity. The flow velocity and force characteristics were computed by applying the “Cosine Law” for yawed cylinders. The data correlations for yawed cylinders based on the cosine law were in fair agreement with data previously presented for unyawed cylinders. The amplitude and phase angle of fluctuating lift in terms of the peak cylinder amplitude are shown. The lock-in region boundary of the reduced velocity and the peak cylinder amplitude in terms of the reduced damping are also given.