Statistics of Passive Vectors in an Unstable Periodic Flow of Couette System(Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid mechanics)
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概要
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The mixing properties of the orientation of passive vectors in an unstable periodic flow of Couette system are investigated numerically. The flow domain is divided into many small cubic regions and the distribution of directions of many passive vectors in each cube is calculated at several temporal phases of the unstable periodic flow. It is found that in most of cubes the passive vectors align either in a single direction (linear region) or on a plane (planar region). The unstable periodic flow exhibits the characteristic features of Couette turbulence having the streamwise vortices and the low-speed streaks. The linear regions are observed in streamwise vortices and low-speed streaks (or the ejection region near the wall), the planar regions in the periphery of vortices and in the sweep region near the wall. The dispersion in direction of passive vectors (also fluid mixing) depends on their near-past history over the characteristic times of the unstable periodic flow.
- 社団法人日本物理学会の論文
- 2008-08-15
著者
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WATANABE Takeshi
Department of Molecular Immunology, Medical Institute of Bioregulation, Kyushu University
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Kida Shigeo
Department Of Mechanical Engineering And Science Kyoto University
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TAYA Takao
Department of Mechanical Engineering and Science, Kyoto University
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Taya Takao
Department Of Mechanical Engineering And Science Kyoto University
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Watanabe Takeshi
Department Of Applied Biological Chemistry Faculty Of Agriculture Niigata University
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Watanabe Takeshi
Department Of Mechanical Engineering And Science Kyoto University
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Watanabe Takeshi
Department Of Agricultural Chemistry Faculty Of Agriculture Tohoku University
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