Generation of shear flows and vortices in rotating anelastic convection
Abstract
We consider the effect of stratification on systematic, largescale flows generated in anelastic convection. We present results from threedimensional numerical simulations of convection in a rotating plane layer in which the angle between the axis of rotation and gravity is allowed to vary. This model is representative of different latitudes of a spherical body. We consider two distinct parameter regimes: (i) weakly rotating and (ii) rapidly rotating. In each case, we examine the effect of stratification on the flow structure and heat transport properties focussing on the difference between Boussinesq and anelastic convection. Furthermore, we show that regimes (i) and (ii) generate very different largescale flows and we investigate the role stratification has in modifying these flows. The stratified flows possess a net helicity not present in the Boussinesq cases which we suggest, when combined with the selfgenerated shear flows, could be important for dynamo action.
 Publication:

arXiv eprints
 Pub Date:
 January 2020
 arXiv:
 arXiv:2001.07953
 Bibcode:
 2020arXiv200107953C
 Keywords:

 Physics  Fluid Dynamics;
 Astrophysics  Solar and Stellar Astrophysics
 EPrint:
 18 pages, 12 figures. Accepted for publication in Physical Review Fluids