Three-dimensional Characteristics of the Slipstream Induced by a High-Speed Train Passing through a Tunnel

Abstract

Based on three-dimensional, unsteady, compressible and RNG k-ε turbulence model, the train-induced slipstream inside the tunnel is numerically investigated using CFD software FLUENT. The characteristics of the slipstream at two sides of the tunnel and the three components of the slipstream were analyzed. The spatial distribution of the maximum slipstream velocity in the longitudinal, horizontal and vertical direction were presented. Results showed that the train-induced slipstream in the tunnel is mainly one-dimensional flow at longitudinal direction, so the X-component of the slipstream is dominant. The maximum slipstream velocity attenuates with increase of the height above the ground and the increasing distance from the tunnel center line, and the attenuation law is curve-fitted by quadratic function.