Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/13847
Title: Transition phenomena in the wakes of cylinders
Authors: TONG XIAOHU
Keywords: Cylinder Wake, PIV, Secondary instability, Square cylinder, Streamwise vortex, Transition.
Issue Date: 29-Apr-2004
Source: TONG XIAOHU (2004-04-29). Transition phenomena in the wakes of cylinders. ScholarBank@NUS Repository.
Abstract: The transition phenomena in the wake of a square cylinder were investigated. This study confirms the existence of mode A and mode B instabilities in the square cylinder wake. The critical Reynolds numbers for the inception of these instability modes were identified through the determination of the discontinuities in the S-Re curves. Streamwise vortices with different wavelength at various Reynolds numbers were observed through flow visualization, and it was found that the secondary vortices from the top and bottom vortex rows were out-of-phase with each other in the mode A regime, but in-phase with each other in the mode B regime. PIV technique was also employed to quantitatively measure the parameters of streamwise vortices. The wavelength of the streamwise vortices in the mode A and B regimes were measured by using the auto-correlation method.
URI: http://scholarbank.nus.edu.sg/handle/10635/13847
Appears in Collections:Ph.D Theses (Open)

Show full item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
thesis_txh_(2003).pdf12.03 MBAdobe PDF

OPEN

NoneView/Download

Page view(s)

241
checked on Dec 11, 2017

Download(s)

181
checked on Dec 11, 2017

Google ScholarTM

Check


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