Numerical Simulation Analysis Of Aerodynamic Characteristics About Train-bridge System Of Continuous Beam In High-speed Railway

The augment of bridge span and train running speed increase the sensitivities of bridge and train caused by strong wind and the possibility of wind-induced accidents. The research of aerodynamic characteristics in train-bridge system are the technical prerequisites of understanding and forecasting the safety in train operation which has important theoretical significance and engineering value.The research in this paper is one of the main content of the National Natural Science Foundation Project "Wind tunnel experiments study on the aerodynamic characteristics of vehicle-bridge system for high-speed railway and overturning resistance of train under strong wind environment (NO.51178471)",which is based on a large continuous beam bridge in Shanghai-Kunming high-speed railway, use computational fluid dynamics software Fluent to make numerical simulations under variety of environments and consider the impact of train overturning by wind-resistant measures. The specific research contents are as follows:1. Make a comprehensive review about the research survey and current status of the wind-train-bridge system at home and abroad and make a detailed introduction to the principles and analytical methods for the theoretical knowledge of fluid mechanics and numerical simulation technology.2. Use Fluent program to make numerical simulation analysis of the train, the bridge and the train-bridge system, study the tendency of mean aerodynamic force coefficient of each unit changed with the difference of the wind attack angle, average wind speed and beam height,based on the related fluid mechanics theory to analysis the influence of aerodynamic performance about train and bridge caused by the coupling of train-bridge system through the comparison of mean aerodynamic force coefficient between the train and bridge which is alone and in train-bridge system.3. Compare the mean aerodynamic force coefficient of the train which is on the windward side, leeward side and parallel condition in different beam heights in the train-bridge system, assess the traffic safety when the train running in the different position.4. Study the tendency of mean aerodynamic force coefficient of train-bridge system under different heights of wind break wall in continuous beam bridge caused by the changes of the wind attack angle and beam height, study the effects of the aerodynamic performance of the train and bridge in train-bridge system caused by the wind break wall, establish the model of train overturning to calculate the overturning moment under different conditions and make an evaluation the influence of the stability of train overturning caused by the wind break wall which is a wind-resistant measures in continuous beam bridge.