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Mean Flows and the Onset of Chaos in Large-Cell Convection

1988; American Physical Society; Volume: 60; Issue: 22 Linguagem: Inglês

10.1103/physrevlett.60.2269

1092-0145

Henry Greenside, M. C. Cross, W.M. Coughran,

Advanced Thermodynamics and Statistical Mechanics

Numerical simulations of two-dimensional model equations show that a coupling between amplitude and vertical-vorticity fields allows chaotic flows near the onset of Rayleigh-B\'enard convection in large-aspect-ratio domains. In cylindrical cells, mean flows arising from this coupling lead to a chaotic nucleation of dislocations that is remarkably similar to recent observations in convection experiments.