Wind and Structures

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Experimental study on wake-induced vibrations of two circular cylinders with two degrees of freedom

  • Du, Xiaoqing (Department of Civil Engineering, Shanghai University) ;
  • Jiang, Benjian (Department of Civil Engineering, Shanghai University) ;
  • Dai, Chin (Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University) ;
  • Wang, Guoyan (School of Aerospace Engineering and Applied Mechanics, Tongji University) ;
  • Chen, Suren (Department of Civil and Environmental Engineering, Colorado State University)
  • Received : 2017.09.18
  • Accepted : 2017.12.09
  • Published : 2018.02.25
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Abstract

Wind tunnel tests are conducted to investigate wake-induced vibrations of two circular cylinders with a center-to-center spacing of 4 diameters and attack angle varying from $0^{\circ}$ to $20^{\circ}$ for Reynolds numbers between 18,000 and 168,800. Effects of structural damping, Reynolds number, attack angle and reduced velocity on dynamic responses are examined. Results show that wake-induced vortex vibrations of the downstream cylinder occur in a wider range of the reduced velocity and have higher amplitudes in comparison to the vortex-induced vibration of a single circular cylinder. Two types of wake-induced instability phenomena with distinct dynamic characteristics are observed, which may be due to different generation mechanisms. For small attack angles like $5^{\circ}$ and $10^{\circ}$, the instability of the downstream cylinder characterizes a one-degree-of-freedom (1-DOF) oscillation moving in the across-wind direction. For a large attack angle like $20^{\circ}$, the instability characterizes a two-degree-of-freedom (2-DOF) oscillation with elliptical trajectories. For an attack angle of $15^{\circ}$, the instability can transform from the 1-DOF pattern to the 2-DOF one with the increase of the Reynolds number. Furthermore, the two instabilities show different sensitivity to the structural damping. The 1-DOF instability can be either completely suppressed or reduced to an unsteady oscillation, while the 2-DOF one is relatively less sensitive to the damping level. Reynolds number has important effects on the wake-induced instabilities.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of PRC, Natural Science Foundation of Shanghai

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