Mean flow generation in rotating anelastic two-dimensional convection

Abstract

We investigate the processes that lead to the generation of mean flows in two-dimensional anelastic convection. The simple model consists of a plane layer that is rotating about an axis inclined to gravity. The results are two-fold: firstly we numerically investigate the onset of convection in three-dimensions, paying particular attention to the role of stratification and highlight a curious symmetry. Secondly, we investigate the mechanisms that drive both zonal and meridional flows in two dimensions. We find that, in general, non-trivial Reynolds stresses can lead to systematic flows and, using statistical measures, we quantify the role of stratification in modifying the coherence of these flows.

arXiv comment28 pages, 9 figures

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• Phase and amplitude evolution in the network of triadic interactions of the Hasegawa-Wakatani system
• Generation of shear flows and vortices in rotating anelastic convection
• The rotational influence on solar convection
• The effect of magnetic field on mean flow generation by rotating two-dimensional convection