Vertical profile of the gas radial velocity obtained in two hydrodynamical viscous simulations with the Pencil code (red solid line) and with the JUPITER code (solid blue line). The two sets of curves plot the simulations results obtained with α = 5 × 10^-3 and 10^-2 while the dashed lines are the analytical predictions of Eq. (14). Numerical and analytical results are in excellent agreement with each other.