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Flow transitions in the surface switching of rotating fluid

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Title: Flow transitions in the surface switching of rotating fluid
Authors: Tasaka, Y. Browse this author →KAKEN DB
Iima, M. Browse this author
Issue Date: Oct-2009
Publisher: Cambridge University Press
Journal Title: Journal of Fluid Mechanics
Volume: 636
Start Page: 475
End Page: 484
Publisher DOI: 10.1017/S0022112009991005
Abstract: 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: http://journals.cambridge.org/action/displayJournal?jid=FLM
Type: article
URI: http://hdl.handle.net/2115/39840
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 田坂 裕司

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