Gas cylindrical radial velocity for the simulations analysed in this work. In each panel, the grey lines represent the (mass weighted) radial velocity profile at a given time averaged in a time span of 100 Myr. The black line is the average cylindrical radial velocity and the green shaded area represents the standard deviation. On the bottom left corner the radial velocity averaged within the radial range 0 ≤ R/R_d ≤ 1 is indicated.