Dependence of the large-scale vortex instability on latitude, stratification, and domain size

摘要: In an earlier study, we reported on the excitation of large-scale vortices in Cartesian hydrodynamical convection models subject to rapid enough rotation. that conditions for onset instability were investigated terms Reynolds (Re) and Coriolis (Co) numbers located at stellar North pole. this extend our investigation varying domain sizes, increasing stratification, place box different latitudes. The effect size is increase sizes generated structures, so principal vortex always fills roughly half computational domain. becomes stronger sense temperature anomaly change radial velocity are observed be enhanced. model with smallest found stable against instability, suggesting a sufficient scale separation between convective eddies required work. can seen upto colatitude 30 degrees, above which value flow dominated by other types mean flows. also larger stratification. Unlike weakly stratified cases, caused structures depend depth (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)