Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/14704
Title: A PIV study on flow past a square cylinder
Authors: PENG KUN
Keywords: PIV, vortex, square cylinder, Reynolds number, St, angles of incidence
Issue Date: 12-May-2005
Source: PENG KUN (2005-05-12). A PIV study on flow past a square cylinder. ScholarBank@NUS Repository.
Abstract: Flows over a square cylinder were investigated by PIV. The Reynolds numbers (Re) investigated were 180 to 1000 at different angles of incidence (I?). It was found that the vortex shedding model proposed by Gerrard (1966b) applies. The length of the recirculation region and the vortex formation increase and peak at Re = 250 (for I? = 0Es, 2Es and 4Es) and 500 (for I? = 6Es), before decreases to Re = 1000. Flow reattachment was observed at Re = 250 and 1000. St reduces with the increase of Re. At Re = 180 and 500, St was relatively constant with I?, but St increases with I? at Re = 250 and 1000. The vortex spacing ratio increases in the order of a??circular cylinder a?? square cylinder in the Mode B regime a?? square cylinder in the Mode A regimea??. The strength of vortices (I?KM) was quite constant at 3.5A?0.3 at Re = 180 to 500. But for Re = 1000, I?KM of the top row vortices was clearly smaller than that of the bottom row vortices at I? = 2Es, 4Es and 6Es.
URI: http://scholarbank.nus.edu.sg/handle/10635/14704
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