Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/15163
Title: Vortex-induced vibration characteristics of two fixed-supported elastic cylinders
Authors: Wang, ZJ
Zhou, Y
So, RMC
Issue Date: 2003
Source: Journal of fluids engineering, transactions of the asme, 2003, v. 125, no. 3, p. 551-560 How to cite?
Journal: Journal of Fluids Engineering, Transactions of the ASME 
Abstract: Interference effects on vortex-induced vibrations of two side-by-side elastic cylinders, fixed at both ends (with no deflection and displacement) in a cross-flow, were experimentally investigated. The dynamic responses of the cylinders were measured using two fiber-optic Bragg grating (FBG) sensors. Simultaneously, a single hot wire was used to measure the velocity in the wake. It has been previously observed that violent resonance occurs when transverse cylinder spacing ratio, T/d, is either large (>2.0) or small (<1.2), but not for intermediate cylinder spacing, i.e., T/d = 1.2-2.0. This work aims to improve the understanding of the physics behind this observation, and mostly focuses on the fluid-structure interaction in the flow regime of intermediate cylinder spacing. It is well known that in this flow regime the fluid dynamics around one cylinder is totally different from that around the other; the vortical structures are characterized by different dominant frequencies, i.e., about 0.1 and 0.3 (normalized), respectively. The present data indicates that the vortical structures at these frequencies are either weak or different in the formation process from the case of T/d>2.0 or T/d<1.2, thus resulting in a weak excitation and subsequently an absence of violent resonance. The interrelationship between the vortical structures generated by the two cylinders is also investigated and interpreted in terms of different vortex generation mechanisms. The different fluid dynamics around each cylinder is further found to be responsible for a deviation between the natural frequencies of the combined fluid-cylinder system associated with each cylinder.
URI: http://hdl.handle.net/10397/15163
ISSN: 0098-2202
DOI: 10.1115/1.1568360
Appears in Collections:Journal/Magazine Article

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

SCOPUSTM   
Citations

3
Last Week
0
Last month
0
Citations as of May 25, 2017

WEB OF SCIENCETM
Citations

3
Last Week
0
Last month
0
Citations as of May 20, 2017

Page view(s)

22
Last Week
0
Last month
Checked on May 21, 2017

Google ScholarTM

Check

Altmetric



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