Numerical Investigation of Pressure Variation due to High-speed Maglev Trains Passing Each Other in Open Air

摘要

Based on the compressible Navier-Stokes equations and k-£ turbulent model, a three-dimensional CFD model was built and Finite Volume Method (FVM) was used to simulate the pressure fluctuation due to the passage of two high-speed EMS maglev trains in open air in this paper. The CFD model employed the techniques of moving mesh and arbitrary connectivity to simulate the relative motion of two mesh blocks that define flow domains of the individual maglev train. The distance between the two tracks is 5.1 m and the speed of the maglev train varies from 200 km/h to 500 km/h. The height of the track is 10 m. On these conditions, the entire process of train nose passage was simulated. History of the pressure on the train surface was recorded. Numerical results are compared with that of field measurement and a qualitative agreement is found between them. The pressure variation is also computed when the distance between the two tracks varies from 4.9 m to 5.9 m at the train speed of 500 km/h. Based on the calculated results, according to different maximum tolerable pressure variation ΔPmax, the least distance between the two tracks of maglev train is proposed when the speed of the train is 500 km/h.