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Title: Transition phenomena in the wakes of cylinders
Keywords: Cylinder Wake, PIV, Secondary instability, Square cylinder, Streamwise vortex, Transition.
Issue Date: 29-Apr-2004
Citation: 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.
Appears in Collections:Ph.D Theses (Open)

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