Development And Application Of The Three-Dimensional Numerical Simulation System Of Aerodynamic Effect Produced By High-Speed Train Passing A Tunnel

The paper relies on the item of national high technology development project for the studying on the engineering techniques problems encountered when the magnetic suspension railway from Shanghai to Hangzhou passes the Huangpu River and the item of the national natural science fund undertaken by Southwest Jiaotong University for the experimental studying on the aerodynamic feature of tunnel-hood, according to the field features induced by a high-speed train entering into tunnels with or without hood to establish three-dimensional unsteady viscous compressible non-homentropic flow model to simulate aerodynamic effects through the secondary development of FLUENT.The paper puts the idea firstly domesticly to substitute the model experiment on the ground of the deep study on the areodynamic effects generated by a train passing through a tunnel, realizes the three-dimensional numerical simulation system guided by the software engineering theory, object-oriented programme design, high-efficiency parameter modeling technique and multiplicate software collabration technique. The system simplifies the modeling process of the tunnel and train and greatly improves the design and optimization efficiency in that the researchers can liberate themselves from the tedious modeling process, pay more attention to the confirmation of the compute scheme and the analysis of the results. The thesis expands the function of FLUENT through the secondary development on User Defined Function (UDF) provided by FLUENT with C language to meet the needs of the complex boundary condition of the study on high-speed train aerodynamic in tunnels. In addition, the thesis exploits the data interface between commercial CFD software and the data processing software, realizes the auto-analysis about the results and turn the tedious data to intuitionistic figure with the visualizatin technique.Based on the item of national high technology development project, the thesis studies the reasonable construction pattern of the tunnel portal, incidence of the micro-pressure wave and the the effect of bell-mouthed hood, lacunarishood and expansile hood on alleviating the micro-pressure wave in the situations of single line and double line, obtains the relationship between the max micro-pressure wave and the velocity of the train as well as the relationship between the max micro-pressure wave and distance of measuring point at the velocity of 100km/h-550km/h, compares the different alleviative effect of the three different hood to max micro-pressure wave and finally proposes the reasonable construction pattern of the tunnel portal. Finally, the thesis compares the two design schemes and put forward the more reasonale one.