Physics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pepi...72..236z&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 72, Issue 3-4, p. 236-248.
Physics
10
Scientific paper
Stability of steadily drifting three-dimensional finite-amplitude columnar rolls at infinite Prandtl number, in a rapidly rotating spherical fluid shell of radius ratio η = ri/r0 = 0.4, is examined. Two types of instability, modulational and amplitude-vacillating, are found. Both instabilities result in the simultaneous breaking of temporal and spatial symmetry of the drifting columnar rolls. Amplitude-vacillating instability leads to a periodic change in amplitude without substantially changing the pattern or scale of convection. Modulational instability gives rise to the transition from the regularly placed columnar rolls to ones which are strongly spatially modulated on a large scale. A dramatic enhancement in heat transfer is produced in both cases through the combined effects of time-dependence and spatial modulations.
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