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Flow transitions in the surface switching of rotating fluid

Published online by Cambridge University Press:  25 September 2009

Y. TASAKA  and
M. IIMA
Y. TASAKA*
Affiliation:
Graduate School of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan
M. IIMA
Affiliation:
Research Institute for Electronic Science, Hokkaido University, N20W10, Sapporo 001-0020, Japan
*
†Email address for correspondence: [email protected]
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Abstract

We study ‘surface switching’ quantitatively in flows driven by the constant rotation of the endwall of an open cylindrical vessel reported by Suzuki, Iima & 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.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 636 , 10 October 2009 , pp. 475 - 484
Copyright
Copyright © Cambridge University Press 2009

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