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Crossflow instability of finite Bödewadt flows: Transients and spiral waves

Phys. Fluids 21, 114107 (2009); doi:10.1063/1.3262817

Published 25 November 2009

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Juan M. Lopez,1 Francisco Marques,2 Antonio M. Rubio,1 and Marc Avila3
1School of Mathematical and Statistical Sciences, Arizona State University, Tempe, Arizona 85287, USA
2Departament de Física Aplicada, Universitat Politècnica de Catalunya, 08034 Barcelona, Spain
3Max Planck Institute for Dynamics and Self-Organization, 37073 Göttingen, Germany
The flow in an enclosed rotating cylinder with a stationary lower end wall is investigated numerically. For fast rotation rates, the flow in the interior is primarily in the azimuthal direction, with an angular momentum distribution very close to that corresponding to solid-body rotation for about the inner-half radius. The differential rotation sets up a large-scale circulation that is primarily present in the boundary layers on the rotating top and sidewalls and the stationary bottom wall, with a very weak effusive component throughout the bulk interior providing a matching between the boundary layer flows on the top and bottom. The top end wall boundary layer has a profile that very closely matches the von Kármán solution for a rotating disk boundary layer; it is stable and very robust to finite disturbances for all rotation rates considered. The boundary layer on the stationary bottom end wall has a profile that agrees with the Bödewadt solution for a stationary disk with an ambient flow in solid-body rotation. This boundary layer is not robust, suffering crossflow instability to multiarmed spiral waves via a supercritical Hopf bifurcation, as well as being susceptible to axisymmetric circular waves that travel radially inward where the boundary layer profile is most inflectional. In the absence of any external forcing, the circular waves are transitory, but low amplitude forcing can sustain them indefinitely, whereas the spiral waves are essentially unaffected by the external forcing. ©2009 American Institute of Physics
History: Received 6 August 2009; accepted 14 October 2009; published 25 November 2009
Permalink: http://link.aip.org/link/?PHFLE6/21/114107/1
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1070-6631 (print)   1089-7666 (online)
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