Higher Velocity Resonance of Circular Cylinder in Crossflow

[+] Author and Article Information
Masataka Shirakashi, Shoichi Wakiya

Engineering Division, Technological University of Nagaoka, Kamitomioka-cho 1603-1, Nagaoka, Niigata Prefecture, 949-54 Japan

Yasuhiro Ishida

Vending Machine Division, Tokyo Sanyo Electric Co., Ltd., Maesuna 160-1, Fukiage-cho, Kitaadachi-gun, Saitama Prefecture, 369-01 Japan

J. Fluids Eng 107(3), 392-396 (Sep 01, 1985) (5 pages) doi:10.1115/1.3242498 History: Received July 20, 1984; Online October 26, 2009


This report concerns the oscillation of an elastically supported circular cylinder in a uniform crossflow. Several investigators have observed an unexpected subharmonic-like resonance at f v /f n = 3 in addition to the normal one at f v /f n = 1, where f v is the Kármán vortex shedding frequency and f n is the natural frequency for the cylinder oscillation. Durgin, et al., proposed an explanation of the mechanism for the abnormal resonance at a higher velocity, which he called the Lower Mode Response. In this work comprehensive experiments on the higher velocity resonance were carried out and two alternative mechanisms are proposed for the phenomenon. It is concluded that, as long as the amplitude of the cylinder oscillation is not too large, the description of Durgin, et al., cannot be applied, and that the end effect at the side wall of the measuring channel or the rotation mode oscillation can be attributed to the local maximum amplitude at a higher velocity.

Copyright © 1985 by ASME
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