Core Dynamics of Multi-Armed Spirals in Rayleigh-Benard Convection

Details Core Dynamics of Multi-Armed Spirals in Rayleigh-Benard Convection Core Dynamics of Multi-Armed Spirals in Rayleigh-Benard Convection

1996-02-14

arxiv.org/abs/patt-sol/9602003v1

Nonlinear Sciences

Pattern Formation and Solitons

7 pages, PostScript (1412kB), PS available at http://milou.msc.cornell.edu/papers/spiral5.ps.gz or ftp://milou.msc.cornell.e

Scientific paper

We report experimental observations of the core dynamics of multi-armed, rotating spirals in Rayleigh-Benard convection for a fluid with Prandtl number near one. In addition to the large-scale rotation of the spirals, we found a cyclic core motion within a central area of radius r = appr. (n lambda/2), where n is the number of spiral arms ending in the core and lambda is the wavelength of the pattern. The dynamics of the core was much faster than the large-scale spiral rotation. We observed multi-armed spirals for which the two periods were commensurate and others for which they were incommensurate.

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