Effects of stratification in spherical shell convection

Details Effects of stratification in spherical shell convection Effects of stratification in spherical shell convection

2011-09-21

arxiv.org/abs/1109.4625v2

Astron. Nachr. 332, 883-890 (2011)

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

7 pages, 9 figures, published version

Scientific paper

10.1002/asna.201111619

We report on simulations of mildly turbulent convection in spherical wedge geometry with varying density stratification. We vary the density contrast within the convection zone by a factor of 20 and study the influence of rotation on the solutions. We demonstrate that the size of convective cells decreases and the anisotropy of turbulence increases as the stratification is increased. Differential rotation is found to change from anti-solar (slow equator) to solar-like (fast equator) at roughly the same Coriolis number for all stratifications. The largest stratification runs, however, are sensitive to changes of the Reynolds number. Evidence for a near-surface shear layer is found in runs with strong stratification and large Reynolds numbers.

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