Breakdown and Rearrangement of Vortex Streets in a Far Wake
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概要
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Breakdown and rearrangement of regular vortex streets in the wake of a circularcylinder are examined experimentally. The evolution of vorLicity field is obtained us-ing digital image processing for visualized flow fields. For 100<7?< 140 (7? is theReynolds number based on the velocity U. and diameter of the cylinder) a primaryvortex street evolves to a parallel shear flow of Gaussian profile due to anisotropic ex-tension of the vortex regions. Subsequently a secondary vortex street of larger scaleappears. Its wavelength is within the instability region in the linear stability theory forthe above velocity profile. The wavelength is, hoxvever, considerably smaller than thatof the most unstable mode. Finally it is shown tlaat the vortex regions in the primaryand secondary vortex streets move at the speeds 0.15 U. - 0.19U. and 0.05 U. - 0.l0&.,respectively, relative to the fluid at infinity.
- 社団法人日本物理学会の論文
- 1989-05-15
著者
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Oikawa Masafumi
Department Of Materials Science And Engineering Iwate University
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Moriya O
Department Of Applied Chemistry National Defense Academy
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Karasudani Takashi
Research Institute For Applied Mechanics Kyushu University
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Oikawa M
Department Of Applied Chemistry National Defense Academy
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Oikawa Masayuki
Research Information Center Institute Of Plasma Physics Nagoya University:research Institute For App
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Funakoshi Mitsuaki
Research Institute For Applied Mechanics Kyushu University
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