Please use this identifier to cite or link to this item:
Title: Free-stream turbulence effects on vortex-induced vibration and flow-induced force of an elastic cylinder
Authors: So, RMC 
Wang, XQ
Xie, W
Zhu, J
Issue Date: 2008
Publisher: Academic Press
Source: Journal of fluids and structures, 2008, v. 24, no. 4, p. 481-495 How to cite?
Journal: Journal of fluids and structures 
Abstract: The effect of free-stream turbulence on vortex-induced vibration of an elastic cylinder in a cross-flow and the associated fluid forces was investigated experimentally. The range of Reynolds number investigated is 5000-41 000. A turbulence generation grid was used to generate turbulence intensity around 10% in the upstream flow. Cylinder displacements in the transverse direction at cylinder mid-span were measured in the reduced velocity range U r0=1.45-12.08. The cylinder vibration has two dominant components, one at the frequency of vortex shedding and another at the natural frequency of the fluid-cylinder system. These are represented by their root-mean-square (r.m.s) values, w yV ′ and w yM ′, respectively. For a nonturbulent uniform flow, w yV ′ is dominant in the U r0 range of 1.45<U r0<7.25, where lock-in occurs at U r0=5.31, while w yM ′ is dominant in the post-lock-in U r0 range of 8.21<U r0<12.08. Free-stream turbulence increases the vortex shedding frequency in the post-lock-in region but does not change the system natural frequency. It also substantially increases w yV ′ in the U r0 range of 1.45<U r0<8.21 range and w yM ′ in the U r0 range of 9.18<U r0<12.08. These features are further studied using flow-induced forces deduced from vibration data. The overall effect of free-stream turbulence can thus be interpreted from the ratio of energy increment; free-stream turbulence feeds energy to the cylinder in general, and this energy transmission reaches a maximum at the lock-in point, and drops rapidly in the off-lock-in region. Therefore, the lock-in region is of main concern when free-stream turbulence is present.
ISSN: 0889-9746
EISSN: 1095-8622
DOI: 10.1016/j.jfluidstructs.2007.10.013
Appears in Collections:Journal/Magazine Article

View full-text via PolyU eLinks SFX Query
Show full item record


Last Week
Last month
Citations as of Dec 19, 2018


Last Week
Last month
Citations as of Dec 13, 2018

Page view(s)

Last Week
Last month
Citations as of Dec 16, 2018

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.