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  • Journal of Fluid Mechanics, Volume 636
  • October 2009, pp. 475-484

Flow transitions in the surface switching of rotating fluid

  • Y. TASAKA (a1) and M. IIMA (a2)
  • DOI: http://dx.doi.org/10.1017/S0022112009991005
  • Published online: 25 September 2009
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.

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Email address for correspondence: tasaka@eng.hokudai.ac.jp
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Y. Tasaka , S. Kon , L. Schouveiler & P. Le Gal 2006 Hysteretic mode exchange in the wake of two circular cylinders in tandem. Phys. Fluids 18, 084104.


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Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
  • URL: /core/journals/journal-of-fluid-mechanics
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