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ISSN: 1065-3090 Print
ISSN: 1940-4336 Online
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Pages: 100
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COMPARISON OF WAKE FLOWS BEHIND SQUARE AND CIRCULAR CYLINDERS
Shinzaburo Umeda
Department of Architecture and Civil Engineering, Fukuyama University
Wen-Jei Yang
Department of Mechanical Engineering and Applied Mechanics, University of Michigan, Ann Arbor, Michigan 48109
ABSTRACT
Our previous study revealed the occurrence of flip-flop phenomena in the exit streams from diamond-shaped cylinder bundles, something that has never been observed in circular cylinder bundles. This motivates us to investigate the basic difference in wake flows behind single-square (a special diamond-shaped quadruple) and circular cylinders. Two kinds of experiments were performed: flow visualization and two-dimensional laser Doppler velocimetry (LDV). The former yields flow patterns by means of a fluorescence dye injection illuminated by a laser light sheet. The LDV experiment produces velocity vector distributions, from which the distribution of vorticity, turbulence intensity, and Reynolds stress can be derived.
pages 11
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