On the dynamics of the large scale circulation in turbulent convection with a free-slip upper boundary

2021 ◽  
pp. 122220
Author(s):  
Joauma Marichal ◽  
Miltiadis V. Papalexandris
Keyword(s):  
Large Scale ◽  
Turbulent Convection ◽  
Large Scale Circulation ◽  
Upper Boundary

Turbulent convection and large scale circulation in a cube with rough horizontal surfaces

2019 ◽  
Vol 99 (3) ◽  
Author(s):  
N. Foroozani ◽  
J. J. Niemela ◽  
V. Armenio ◽  
K. R. Sreenivasan
Keyword(s):  
Large Scale ◽  
Turbulent Convection ◽  
Large Scale Circulation

The wind in confined thermal convection

2001 ◽  
Vol 449 ◽  
pp. 169-178 ◽  
Author(s):  
J. J. NIEMELA ◽  
L. SKRBEK ◽  
K. R. SREENIVASAN ◽  
R. J. DONNELLY
Keyword(s):  
Rayleigh Number ◽  
Large Scale ◽  
Turnover Time ◽  
Turbulent Convection ◽  
Physical Explanation ◽  
Dynamical Parameter ◽  
Large Scale Circulation ◽  
Wide Range ◽  
Circulation Velocity ◽  
Rayleigh Benard

A large-scale circulation velocity, often called the ‘wind’, has been observed in turbulent convection in the Rayleigh–Bénard apparatus, which is a closed box with a heated bottom wall. The wind survives even when the dynamical parameter, namely the Rayleigh number, is very large. Over a wide range of time scales greater than its characteristic turnover time, the wind velocity exhibits occasional and irregular reversals without a change in magnitude. We study this feature experimentally in an apparatus of aspect ratio unity, in which the highest attainable Rayleigh number is about 1016. A possible physical explanation is attempted.

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