Effects of Granulation upon Larger-Scale Convection
  We examine the role of small-scale granulation in helping to drive supergranulation and even larger scales of convection. The granulation is modeled as localized cooling events introduced at the upper boundary of a 3-D simulation of compressible convection in a rotating spherical shell segment. With a sufficient number of stochastic cooling events compared to uniform cooling, we find that supergranular scales are realized, along with a differential rotation that becomes increasingly solar-like. 
Neal Hurlburt, Marc DeRosa, Kyle Augustson and Juri Toomre
astro-ph.SR physics.flu-dyn