  We investigate the processes that lead to the generation of mean flows in
two-dimensional anelastic convection. The simple model consists of a plane
layer that is rotating about an axis inclined to gravity. The results are
two-fold: firstly we numerically investigate the onset of convection in
three-dimensions, paying particular attention to the role of stratification and
highlight a curious symmetry. Secondly, we investigate the mechanisms that
drive both zonal and meridional flows in two dimensions. We find that, in
general, non-trivial Reynolds stresses can lead to systematic flows and, using
statistical measures, we quantify the role of stratification in modifying the
coherence of these flows.
