Radial velocity u_r and α_ϕϕ for anelastic models with buoyancy and for increasing Prandtl numbers. Top: snapshots of the radial velocity u_r. From left to right, the slices correspond to Pr = 0.005 at t = 773 ms, Pr = 0.02 at t = 1128 ms, and Pr = 0.1 at t = 1128 ms. Bottom: 2D distribution of α_ϕϕ for Pr = 0.005 (left), Pr = 0.02 (middle), and Pr = 0.1 (right). The dashed line represents the spherical radius r = 0.92 r_o.