Orientation changes of the large-scale circulation in turbulent Rayleigh-Benard convection

Abstract

We present measurements of the orientation theta_0(t) of the large-scale circulation (LSC) of turbulent Rayleigh-Benard convection in cylindrical cells of aspect ratio 1. theta_0(t) undergoes irregular reorientations. It contains reorientation events by rotation through angles Delta theta with a monotonically decreasing probability distribution p(Delta theta), and by cessations (where the LSC stops temporarily) with a uniform p(Delta theta). Reorientations have Poissonian statistics in time. The amplitude of the LSC and the magnitude of the azimuthal rotation rate have a negative correlation.

4 pages, 5 figures. Under consideration for publication in Physical Review Letters. Some new content has been added, and some content has been removed to make space

References in corpus (2)

• Wind reversals in turbulent Rayleigh-Benard convection
• Heat transport in turbulent Rayleigh-Benard convection: Effect of finite top- and bottom-plate conductivity

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