Predicted and simulated Mach numbers of the 2D model. The orange lines correspond to the MLT prediction: the dashed profile shows the original stellar values, whereas the solid line illustrates the velocities scaled by 10, according to Eq. (30). The blue line shows the 2D results averaged over roughly two convective turnover times, starting at t = 500 h. The profile ends at r ≈ 0.9 R_⋆ as our domain does not contain the entire star model. The gray shaded areas mark the convective core and the small region of surface convection in the 1D model.