Wind and Structures

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Vortex-induced reconfiguration of a tandem arrangement of flexible cylinders

  • Lee, Sang Joon (Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Kim, Jeong Jae (Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Yeom, Eunseop (Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH))
  • Received : 2014.11.19
  • Accepted : 2015.03.19
  • Published : 2015.07.25
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Abstract

Oscillating motions of flexible cylinders are associated to some extent with the aerodynamic response of plants. Tandem motions of reeds with flexible stems in a colony are experimentally investigated using an array of flexible cylinders made of polydimethylsiloxane (PDMS). Consecutive images of flexible cylinders subjected to oncoming wind are recorded with a high-speed camera. To quantify oscillating motions, the average bending angle and displacement of flexible cylinders are evaluated using point-tracking method and spectral analysis. The tandem motions of flexible cylinders are closely related to the flow characteristics around the cylinders. Thus, the dynamic motions of a tandem arrangement of flexible cylinders are investigated with varying numbers of cylinders arranged in-line, numbers of cylinders in a group (behaving like a single body), and Reynolds numbers (Re). When the number of cylinders in a group increases, the damping effect caused by the support of downstream cylinders is pronounced. These results would be provide useful information on the tandem-arranged design of complex structures and energy harvesting devices.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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