Abstract
Abstract
Highlights
Rayleigh–Bénard convection (RBC) occurs when fluid confined between horizontal plates is heated from below and cooled from above in a uniform manner
The canonical form of turbulent RBC is defined by a domain with a fixed height that extends infinitely in the horizontal directions, creating a flow field that is statistically homogenous in the horizontal direction
It has been shown that Γ > 1 turbulent RBC has dynamics that occur on much longer time scales and affects more spatial Fourier modes than RBC in a Γ = 1 cell
Summary
Rayleigh–Bénard convection (RBC) occurs when fluid confined between horizontal plates is heated from below and cooled from above in a uniform manner. Persistent structures whose horizontal length scales are several times larger than the height of the domain, which were recently termed as ‘superstructures’ While these studies provide a valuable insight into statistical properties of the superstructures, the analysis in these papers was largely concerned with the temporally averaged flow fields, filtering out the temporal dynamics of the structures. While the effect of the boundary conditions is present in this study, some of the features of the large-scale mode organization and dynamics that we observe resonate remarkably well with both the time scales (Pandey et al 2018) and the statistical properties (Krug et al 2019) of the superstructures found in larger aspect-ratio domains.
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