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Journal Article

Core dynamics of multi-armed spirals in Rayleigh-Bénard convection


Bodenschatz,  E.       
Laboratory for Fluid Dynamics, Pattern Formation and Biocomplexity, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Plapp, B. B., & Bodenschatz, E. (1996). Core dynamics of multi-armed spirals in Rayleigh-Bénard convection. Physica Scripta, T67, 111-116. doi:10.1088/0031-8949/1996/T67/022.

Cite as: https://hdl.handle.net/21.11116/0000-0003-EC9D-3
We report experimental observations of the core dynamics of multi-armed, rotating spirals in Rayleigh-Bénard 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 congruent to 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 multiarmed spirals for which the two periods were commensurate and others for which they were incommensurate.