Power injected by the turbulent driving in the simulations compared with estimations. Markers represent the time-averaged power injected by the turbulent driving force in order to reproduce the SK relation. The power is computed in the whole simulation box and averaged between 4 and 60 Myr. In these simulations, the driving strength was calibrated so that the SFR was close to the SK relation (see Sect. 6.2 and 6.3, as well as Figs. 10 and 11). The mean value is the total energy injected during the period divided by the time span, while the error bar is the standard deviation from the power computed at each time step. The solid lines refer to the estimates of the possible source of turbulent driving, and the notation is the same as in Sect. 2. The efficiency coefficients (ϵ_sn ~ 0.05, ϵ_acc ~ 0.2, ϵ_rot ϵ [0.1, 1]) are reasonable estimates, as discussed in Sect. 2 as well. To draw the blue line, we assumed that the velocity dispersion was proportional to the column density.