Numerical study on transient aerodynamic behaviors in a subway tunnel caused by a metro train running between adjacent platforms

Abstract

Aerodynamic effects, including slipstream, piston wind, drag, and pressure wave, in the tunnel caused by a metro train running between two adjacent platforms were simulated using a metro train model with six cars, an RNG ᴋ–ε turbulence model, and the sliding mesh technology, and they were verified through some full-scale tests and scale model experiments. Theoretical analysis and computational fluid dynamics (CFD) were used to investigate the formation and spatial–temporal distribution characteristics of the wind environment in a tunnel. The effect of uniform speed on the transient aerodynamic behaviors in the tunnel was analyzed. The results show that there are differences in aerodynamic behaviors in a subway tunnel when a train is in the acceleration and deceleration stages. Piston wind is a kind of high-quality wind resource, and it is better to arrange the wind turbines close to the destination platform. Some results can provide theoretical support for the recovery of wind energy resources and the layout of fans in the tunnel. Further, they can increase the development and utilization of urban underground space.