Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/7551
Title: The finite-length square cylinder near wake
Authors: Wang, HF
Zhou, Y
Issue Date: 2009
Publisher: Cambridge Univ Press
Source: Journal of fluid mechanics, 2009, v. 638, p. 453-490 How to cite?
Journal: Journal of Fluid Mechanics 
Abstract: This paper reports an experimental investigation of the near wake of a finite-length square cylinder, with one end mounted on a flat plate and the other free. The cylinder aspect ratio or height-to-width ratio H/d ranges from 3 to 7. Measurements were carried out mainly in a closed-loop low-speed wind tunnel at a Reynolds number Red, based on d and the free-stream velocity of 9300 using hot-wire anemometry, laser Doppler anemometry and particle image velocimetry (PIV). The planar PIV measurements were performed in the three orthogonal planes of the three-dimensional cylinder wake, along with flow visualization conducted simultaneously in two orthogonal planes (Red = 221). Three types of vortices, i.e. the tip, base and spanwise vortices were observed and the near wake is characterized by the interactions of these vortices. Both flow visualization and two-point correlation point to an inherent connection between the three types of vortices. A model is proposed for the three-dimensional flow structure based on the present measurements, which is distinct from previously proposed models. The instantaneous flow structure around the cylinder is arch-type, regardless of H/d, consisting of two spanwise vortical legs, one on each side of the cylinder, and their connection or bridge near the free end. Both tip and base vortices are the streamwise projections of the arch-type structure in the (y, z) plane, associated with the free-end downwash flow and upwash flow from the wall, respectively. Other issues such as the topological characteristics, spatial arrangement and interactions among the vortical structures are also addressed.
URI: http://hdl.handle.net/10397/7551
DOI: 10.1017/S0022112009990693
Appears in Collections:Journal/Magazine Article

Files in This Item:
File Description SizeFormat 
Wang_Finite-length_Square_Wake.pdf1.3 MBAdobe PDFView/Open
Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

80
Last Week
1
Last month
4
Citations as of May 18, 2017

WEB OF SCIENCETM
Citations

69
Last Week
0
Last month
3
Citations as of May 21, 2017

Page view(s)

51
Last Week
0
Last month
Checked on May 21, 2017

Download(s)

129
Checked on May 21, 2017

Google ScholarTM

Check

Altmetric



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