scholarly journals Two‐fluid single‐column modelling of Rayleigh‐Bénard convection as a step towards multi‐fluid modelling of atmospheric convection

2021 ◽  
Author(s):  
Daniel Shipley ◽  
Hilary Weller ◽  
Peter A. Clark ◽  
William A. McIntyre
Keyword(s):  
Atmospheric Convection ◽  
Bénard Convection ◽  
Benard Convection ◽  
Single Column ◽  
Rayleigh Benard Convection ◽  
Rayleigh Benard ◽  
Two Fluid

scholarly journals Two-fluid single-column modelling of Rayleigh-Bénard convection as a step towards multi-fluid modelling of atmospheric convection

2021 ◽  
Author(s):  
Daniel Shipley ◽  
Hilary Weller ◽  
Peter Clark ◽  
Will McIntyre
Keyword(s):  
Climate Models ◽  
Fluid Model ◽  
Current Model ◽  
Atmospheric Convection ◽  
Bénard Convection ◽  
Benard Convection ◽  
Single Column ◽  
Rayleigh Benard Convection ◽  
Rayleigh Benard ◽  
Two Fluid

Multi-fluid models have recently been proposed as an approach to improving the representation of convection in weather and climate models. This is an attractive framework as it is fundamentally dynamical, removing some of the assumptions of mass-flux convection schemes which are invalid at current model resolutions. However, it is still not understood how best to close the multi-fluid equations for atmospheric convection. In this paper we develop a simple two-fluid, single-column model with one rising and one falling fluid. No further modelling of sub-filter variability is included. We then apply this model to Rayleigh-Bénard convection, showing that, with minimal closures, the correct scaling of the heat flux (Nu) is predicted over six orders of magnitude of buoyancy forcing (Ra). This suggests that even a very simple two-fluid model can accurately capture the dominant coherent overturning structures of convection.

The -dependence of the critical roughness height in two-dimensional turbulent Rayleigh–Bénard convection

2021 ◽  
Vol 911 ◽  
Author(s):  
Jian-Lin Yang ◽  
Yi-Zhao Zhang ◽  
Tian-cheng Jin ◽  
Yu-Hong Dong ◽  
Bo-Fu Wang ◽  
...  
Keyword(s):  
Roughness Height ◽  
Two Dimensional ◽  
Bénard Convection ◽  
Benard Convection ◽  
Rayleigh Benard Convection ◽  
Rayleigh Benard

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