Numerical Simulation of an Express Freight Train and a High-Speed Train Meeting in a Tunnel

Abstract

A numerical simulation of an express freight train and a high-speed train meeting in a tunnel has been conducted by using the CFD technique. The RNG k-ε double equation turbulence model has been adopted. A real train experiment has been conducted and the results of simulation based on simplified models agree reasonably with the experimental data. Distributions of velocity vectors and pressure, aerodynamic performances and pressure monitoring were analyzed. Results show that aerodynamic performances and pressure distributions of two trains are influenced greatly by the meeting process. Pressure monitoring shows that the minimum value of pressure is influenced more greatly than the maximum value. Moreover, aerodynamic performances of the express freight train change more significantly than that of high-speed train due to their distinct aerodynamic shapes.