Effect of weak rotation on large-scale circulation cessations in turbulent convection

Abstract

We investigate the effect of weak rotation on the large-scale circulation (LSC) of turbulent Rayleigh-Bénard convection, using the theory for cessations in a low-dimensional stochastic model of the flow previously studied. We determine the cessation frequency of the LSC as a function of rotation, and calculate the statistics of the amplitude and azimuthal velocity fluctuations of the LSC as a function of the rotation rate for different Rayleigh numbers. Furthermore, we show that the tails of the reorientation probability distribution function remain unchanged for rotating systems, while the distribution of the LSC amplitude and correspondingly the cessation frequency are strongly affected by rotation. Our results are in close agreement with experimental observations.

4 pages, 4 figures

References in corpus (5)

• Flow reversals in thermally driven turbulence
• Rotations and cessations of the large-scale circulation in turbulent Rayleigh-Benard convection
• Origin of the Temperature Oscillation in Turbulent Thermal Convection
• Finite-size effects lead to supercritical bifurcations in turbulent rotating Rayleigh-Bénard convection
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Cited by in corpus (2)

• Heat transport and flow structure in rotating Rayleigh-Bénard convection
• Enhanced azimuthal rotation of the large-scale flow through stochastic cessations in turbulent rotating convection with large Rossby numbers