The vortex-induced structural vibration of an elastic square cylinder, on fixed supports at both ends, in a uniform cross flow was measured using fiber-optic Bragg grating sensors. The measurements are compared to those obtained for an elastic circular cylinder of the same hydraulic diameter in an effort to understand the effect of the nature (fixed or oscillating) of the flow separation point on the vortex-induced vibration. It is found that a violent vibration occurs at the third-mode resonance when the vortex-shedding frequency coincides with the third-mode natural frequency of the fluid-structure system, irrespective of the cross-sectional geometry of the cylinder. This is in distinct contrast to previous reports of flexibly supported rigid cylinders, where the first-mode vibration dominates, thus giving little information on the vibration of other modes. The resonance behavior is neither affected by the incidence angle of the free stream, nor by the nature of the flow separation point. However, the vibration amplitude of the square cylinder is about twice that of the circular cylinder even though the flexural rigidity of the former is larger. This is ascribed to a difference in the nature of the flow separation point between the two types of structures. The characteristics of the effective modal damping ratios, defined as the sum of structural and fluid damping ratios, and the system natural frequencies are also investigated. The damping ratios and the system natural frequencies vary little with the reduced velocity at , but appreciable at ; they further experience a sharp variation, dictated by the vortex-shedding frequency, near resonance.
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e-mail: mmyzhou@polyu.edu.hk
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March 2005
Technical Papers
Vortex-Induced Vibration Characteristics of an Elastic Square Cylinder on Fixed Supports
Z. J. Wang,
Z. J. Wang
Department of Mechanical Engineering,
The Hong Kong Polytechnic University
, Hung Hom, Kowloon, Hong Kong
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Y. Zhou
Y. Zhou
Department of Mechanical Engineering,
e-mail: mmyzhou@polyu.edu.hk
The Hong Kong Polytechnic University
, Hung Hom, Kowloon, Hong Kong
Search for other works by this author on:
Z. J. Wang
Department of Mechanical Engineering,
The Hong Kong Polytechnic University
, Hung Hom, Kowloon, Hong Kong
Y. Zhou
Department of Mechanical Engineering,
The Hong Kong Polytechnic University
, Hung Hom, Kowloon, Hong Konge-mail: mmyzhou@polyu.edu.hk
J. Fluids Eng. Mar 2005, 127(2): 241-249 (9 pages)
Published Online: September 27, 2004
Article history
Received:
February 18, 2004
Revised:
September 27, 2004
Citation
Wang, Z. J., and Zhou, Y. (September 27, 2004). "Vortex-Induced Vibration Characteristics of an Elastic Square Cylinder on Fixed Supports." ASME. J. Fluids Eng. March 2005; 127(2): 241–249. https://doi.org/10.1115/1.1881693
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