Boundary Zonal Flow in Rotating Turbulent Rayleigh-Bénard Convection
| Autor: | Eberhard Bodenschatz, Guenter Ahlers, Robert E. Ecke, Susanne Horn, Marcel Wedi, Dennis P. M. van Gils, Lukas Zwirner, Stephan Weiss, Xuan Zhang, Olga Shishkina |
|---|---|
| Přispěvatelé: | Physics of Fluids |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Convection
Physics Turbulence General Physics and Astronomy Boundary (topology) Mechanics Physics - Fluid Dynamics Rotation 01 natural sciences Physics::Fluid Dynamics Circulation (fluid dynamics) 0103 physical sciences Zonal flow Ekman number 010306 general physics Physics::Atmospheric and Oceanic Physics Rayleigh–Bénard convection |
| Zdroj: | Physical review letters, 124(8):084505. American Physical Society |
| ISSN: | 0031-9007 |
| Popis: | For rapidly rotating turbulent Rayleigh--B\'enard convection in a slender cylindrical cell, experiments and direct numerical simulations reveal a boundary zonal flow (BZF) that replaces the classical large-scale circulation. The BZF is located near the vertical side wall and enables enhanced heat transport there. Although the azimuthal velocity of the BZF is cyclonic (in the rotating frame), the temperature is an anticyclonic traveling wave of mode one whose signature is a bimodal temperature distribution near the radial boundary. The BZF width is found to scale like $Ra^{1/4}Ek^{2/3}$ where the Ekman number $Ek$ decreases with increasing rotation rate. |
| Databáze: | OpenAIRE |
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