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Rapidly rotating turbulent Rayleigh-Bénard convection

Published online by Cambridge University Press:  26 April 2006

K. Julien
Affiliation:
Joint Institute for Laboratory Astrophysics, University of Colorado, Boulder. CO 80309, USA National Center for Atmospheric Research, Boulder, CO 80307, USA Present address: University of California, Los Angeles, CA 90007, USA.
S. Legg
Affiliation:
Joint Institute for Laboratory Astrophysics, University of Colorado, Boulder. CO 80309, USA National Center for Atmospheric Research, Boulder, CO 80307, USA
J. Mcwilliams
Affiliation:
National Center for Atmospheric Research, Boulder, CO 80307, USA
J. Werne
Affiliation:
National Center for Atmospheric Research, Boulder, CO 80307, USA

Abstract

Turbulent Boussinesq convection under the influence of rapid rotation (i.e. with comparable characteristic rotation and convection timescales) is studied. The transition to turbulence proceeds through a relatively simple bifurcation sequence, starting with unstable convection rolls at moderate Rayleigh (Ra) and Taylor numbers (Ta) and culminating in a state dominated by coherent plume structures at high Ra and Ta. Like non-rotating turbulent convection, the rapidly rotating state exhibits a simple power-law dependence on Ra for all statistical properties of the flow. When the fluid layer is bounded by no-slip surfaces, the convective heat transport (Nu − 1, where Nu is the Nusselt number) exhibits scaling with Ra2/7 similar to non-rotating laboratory experiments. When the boundaries are stress free, the heat transport obeys ‘classical’ scaling (Ra1/3) for a limited range in Ra, then appears to undergo a transition to a different law at Ra ≈ 4 × 107. Important dynamical differences between rotating and non-rotating convection are observed: aside from the (expected) differences in the boundary layers due to Ekman pumping effects, angular momentum conservation forces all plume structures created at flow-convergent sites of the heated and cooled boundaries to spin-up cyclonically; the resulting plume/cyclones undergo strong vortex-vortex interactions which dramatically alter the mean state of the flow and result in a finite background temperature gradient as Ra → ∞, holding Ra/Ta fixed.

Type
Research Article
Copyright
© 1996 Cambridge University Press

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