Simulation Study of Mhd Dynamo: Convection in a Rotating Spherical Shell

摘要

Numerical simulations on the thermal convection of a neutral fluid (without themagnetic field) in a rotating spherical shell have been performed. The results indicate that if the rotation is sufficiently rapid, the fluid results in a strong differential rotation where an equatorial acceleration is remarkable. The formation dynamics of convection columns aligned to the rotation axis is studied extensively. A new model of generation mechanism of the differential rotation is then proposed which concludes that the fluid motion generates an equatorial acceleration by selectively exciting the cyclonic columns in the spherical shell.