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|Title: ||Wake flow behind two side-by-side square cylinders|
|Authors: ||Shun C. Yen;Jung H. Liu|
|Contributors: ||NTOU:Department of Mechanical and Mechatronic Engineering|
|Keywords: ||Side-by-side square cylinders;Surface pressure;Gap-flow|
|Issue Date: ||2011-10-20T08:09:32Z
|Publisher: ||International Journal of Heat and Fluid Flow|
|Abstract: ||Abstract:This study investigates the flow structures, form drag coefficients and vortex-shedding characteristics behind a single-square cylinder and two side-by-side cylinders in an open-loop wind tunnel. The Reynolds number (Re) and gap ratio (g∗) are 2262 < Re < 28,000 and 0 ⩽ g∗ ⩽ 12, respectively. The flow patterns around the square cylinders are determined using the smoke-wire scheme. Experimental results indicate that the flow structures behind two side-by-side square cylinders are classified into three modes – single mode, gap-flow mode and couple vortex-shedding. The gap-flow mode displays anti-phase vortex shedding induced from the interference between the two square cylinders. However, the couple vortex-shedding mode exhibits in-phase vortex shedding that is caused by the independent flow behavior behind each square cylinder. The surface-pressure profile, form drag coefficient for each square cylinder () and vortex-shedding frequency were measured and calculated using a pressure transducer and a hot-wire anemometer. For two side-by-side cylinder configurations, the maximum of 2.24 occurs in the single mode, while the minimum of 1.68 occurs in the gap-flow mode. Additionally, the in the coupled vortex-shedding mode is intermediate and approximately equal to that of a single (isolated) square cylinder. Moreover, the single mode has the highest Strouhal number (St) and the gap-flow mode has the lowest St.|
|Relation: ||32(1), pp. 41–51|
|Appears in Collections:||[機械與機電工程學系] 期刊論文|
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