Flow transitions in the surface switching of rotating fluid

Tasaka, Y.; Iima, M.

Flow transitions in the surface switching of rotating fluid

Tasaka, Y.; Iima, M.

Journal of Fluid Mechanics, 2009, 636, 475-484

Permalink : https://hdl.handle.net/2115/39840

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アクセス権	open access
URI	https://hdl.handle.net/2115/39840
タイトル	Flow transitions in the surface switching of rotating fluid
著者	e-Rad_Researcher 00419946 著者名 Tasaka, Y.
著者	著者名 Iima, M.
言語	英語
発行日	2009-10
出版者	Cambridge University Press
収録物名	Journal of Fluid Mechanics
巻(号)	636
ページ	475-484
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.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	© Cambridge University Press 2009
PISSN	0022-1120
関連情報	URI http://journals.cambridge.org/action/displayJournal?jid=FLM
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1017/S0022112009991005