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An evacuation process is simulated within the Social Force Model. Thousandpedestrians are leaving a room by one exit. We investigate the stationarity ofthe distribution of time lags between instants when two successive pedestrianscross the exit. The exponential tail of the distribution is shown to graduallyvanish. Taking fluctuations apart, the time lags decrease in time till thereare only about 50 pedestrians in the room, then they start to increase. Thissuggests that at the last stage the flow is laminar. In the first stage,clogging events slow the evacuation down. As they are more likely for largercrowds, the flow is not stationary. The data are investigated with detrendedfluctuation analysis.

Evacuation in the Social Force Model is not stationary