Journal of Fluid Mechanics



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Hysteretic gravity-wave bifurcation in a highly turbulent swirling flow


NICOLÁS MUJICA a1a2 and DANIEL P. LATHROP a1
a1 Department of Physics, IREAP and IPST, University of Maryland, College Park, MD 20742, USA
a2 Departamento de Física, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Avenida Blanco Encalada 2008, Santiago, Chile

Article author query
mujica n   [Google Scholar] 
lathrop dp   [Google Scholar] 
 

Abstract

We report on experimental observations of a gravity-wave instability forced by a highly turbulent free-surface Taylor–Couette flow. Bistability and hysteresis are observed at the bifurcation from a turbulent base state, with an axisymmetric mean flow, to a turbulent gravity-wave state, with an azimuthal $m\,{=}\,1$ pattern related to the mean flow and free surface. We show that the critical Reynolds number at which the wave state appears is not sharply defined as it depends on turbulent fluctuations.

(Published Online March 9 2006)
(Received February 27 2005)
(Revised September 6 2005)



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