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J. Fluid Mech. (2009), vol. 638, pp. 383400. c Cambridge University Press 2009 doi:10.1017/S0022112009991224
 

Summary: J. Fluid Mech. (2009), vol. 638, pp. 383­400. c Cambridge University Press 2009
doi:10.1017/S0022112009991224
383
The origin of oscillations of the large-scale
circulation of turbulent Rayleigh­B´enard
convection
ERIC BROWN1
AND GUENTER AHLERS2
1
The James Franck Institute, University of Chicago, Chicago, IL 60637, USA
2
Department of Physics and iQCD, University of California, Santa Barbara, CA 93106, USA
(Received 25 February 2009; revised 5 July 2009; accepted 16 July 2009; first published online
1 October 2009)
In agreement with a recent experimental discovery by Xi et al. (Phys. Rev. Lett.,
vol. 102, 2009, paper no. 044503), we also find a sloshing mode in experiments
on the large-scale circulation (LSC) of turbulent Rayleigh­B´enard convection in a
cylindrical sample of aspect ratio one. The sloshing mode has the same frequency as
the torsional oscillation discovered by Funfschilling & Ahlers (Phys. Rev. Lett., vol. 92,
2004, paper no. 1945022004). We show that both modes can be described by an

  

Source: Ahlers, Guenter - Department of Physics, University of California at Santa Barbara

 

Collections: Physics