In the paper, the flow induced by the piston effect in metro tunnels is evaluated by numerical analysis according to the train speed, tunnel and train geometry, types of induced flows and other variable characteristics. It is shown that the presence of two phases is characteristic of the piston effect caused by the movement of trains in metro tunnels. In the first phase, the piston effect is characterized by non-stationarity, and in the second phase, the process stabilizes. It is necessary to take into account the influence of the mentioned phases in order to determine the speed of the circulation flows correctly. The speed of the circulation flow driven by the effect of the piston experiences substantial variation considering the degree of non-stationarity of the process in the case of the average statistical length of the metro tunnels (1200 m) and the nominal speed of the train 30-50 km/h.
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