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Flow transitions in the surface switching of rotating fluid

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タイトル: Flow transitions in the surface switching of rotating fluid
著者: Tasaka, Y. 著作を一覧する
Iima, M. 著作を一覧する
発行日: 2009年10月
出版者: Cambridge University Press
誌名: Journal of Fluid Mechanics
巻: 636
開始ページ: 475
終了ページ: 484
出版社 DOI: 10.1017/S0022112009991005
抄録: We study 'surface switching' quantitatively in flows driven by the constant rotation of the endwall of an open cylindrical vessel reported by Suzuki, lima & Hayase (Phys. Fluids, vol. 18, 2006, p. 101701): the deformed free surface switches between axisymmetric and non-axisymmetric shapes accompanied by irregular vertical oscillation. Detailed simultaneous measurements showed that the magnitude of the velocity fluctuations (turbulent intensity) temporally varies greatly and are strongly correlated with the surface height, suggesting that dynamic switching between laminar and turbulent states is accompanied by vessel-scale surface shape changes. The study also identified clear hysteresis in the turbulent intensity arising from changes in the Reynolds number; the bifurcation diagram consists of two overlapping branches representing a high-intensity (turbulent) state and a low-intensity (laminar) state. Based on the results, a switching mechanism is suggested.
Rights: © Cambridge University Press 2009
Relation (URI):
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 田坂 裕司


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