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Effect of the centrifugal force on domain chaos in Rayleigh-Bnard convection Nathan Becker,1,

Summary: Effect of the centrifugal force on domain chaos in Rayleigh-Bénard convection
Nathan Becker,1,
* J. D. Scheel,2,
M. C. Cross,2,
and Guenter Ahlers1,§
Department of Physics and iQCD, University of California, Santa Barbara, California 93106, USA
Department of Physics, California Institute of Technology 114-36, Pasadena, California 91125, USA
Received 14 November 2005; published 23 June 2006
Experiments and simulations from a variety of sample sizes indicated that the centrifugal force significantly
affects the domain-chaos state observed in rotating Rayleigh-Bénard convection-patterns. In a large-aspect-
ratio sample, we observed a hybrid state consisting of domain chaos close to the sample center, surrounded by
an annulus of nearly stationary nearly radial rolls populated by occasional defects reminiscent of undulation
chaos. Although the Coriolis force is responsible for domain chaos, by comparing experiment and simulation
we show that the centrifugal force is responsible for the radial rolls. Furthermore, simulations of the Bouss-
inesq equations for smaller aspect ratios neglecting the centrifugal force yielded a domain precession-
frequency f with 1 as predicted by the amplitude-equation model for domain chaos, but contradicted
by previous experiment. Additionally the simulations gave a domain size that was larger than in the experi-
ment. When the centrifugal force was included in the simulation, and the domain size were consistent with


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


Collections: Physics