On the Vortex-Induced Oscillation of Long Structural Elements

[+] Author and Article Information
W. D. Iwan

California Institute of Technology, Pasadena, Calif. 91125

N. P. Jones

The Johns Hopkins University, Baltimore, Md. 21218

J. Energy Resour. Technol 109(4), 161-167 (Dec 01, 1987) (7 pages) doi:10.1115/1.3231342 History: Received October 15, 1987; Online October 22, 2009


Previous solutions to the vortex-induced vibration of structures have been primarily based on modal analysis, using a one or two-mode approximation. Such an analysis is generally meaningful only when the vortex shedding frequency is locked onto a natural frequency of the structure. In very large structures, typical of those found in some ocean engineering applications, modes are closely spaced, and it is not reasonable to assume total spanwise correlation in the fluid forces or response. The approach used herein avoids the limitations associated with the modal solution of such problems by implementing a solution based on the traveling wave nature of the response. Results presented indicate that the amplitude of response of a long cable is smaller than is predicted by a conventional modal analysis. The drag forces on such a structure may therefore be overestimated by current design approaches.

Copyright © 1987 by ASME
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