The Numerical Study Of Aerodynamic Characteristics Of Each Other When High-speed Trains Move On Bridge

With the development of high speed railway and train speed, The aerodynamic characteristics of train/vehicles are being getted increasingly serious. The aerodynamic characteristics of high speed trains on bridge become an important engineering problem not only related to running safety, but also related to passenger riding comfort of vehicles. Therefore, it is greatly significant to study the aerodynamic characteristics of vehicle and bridge when trains run on the bridge.For the issue of aerodynamic characteristics of high-speed train running on the bridge, based on 3-D steady and incompressible Navier-Stokes equation, and RNGκ-εturbulence model, this thesis establishes a dynamic simulation model of high-speed trains with the help of the Finite Volume Method(FVM) and the dynamic grid technology, then study the aerodynamic characteristics of vehicles and bridge, considering the factors of bridge and rail board. The main contents and achievements of this thesis are as follows:1.The high-speed train and bridge system dynamic model is established. Compared the result of static gird model with dynamic gird model, both results have little difference. But dynamic gird model is more consistent with the train actual operation. Therefore, the simulation method of train-bridge system model uses dynamic grid technology.2.According to the requirement of wind tunnel experiments, the aerodynamic characteristics of bridge section are calculated through simulating the scale 1:20 model using static grid technology, then this thesis summarizes and analyses the trend of change of the aerodynamic coefficients; Additional, it is also being studied the changing regularity aerodynamic coefficients of vehicles in different wind yaw angle.3.The aerodynamic characteristics of vehicle and bridge are analyzed when trains run on the bridge.the aerodynamic characteristics of each other are calculated in different train speed or crossing wind speed, meanwhile, the aerodynamic coefficients of trains located in the windward and leeward are compared and the aerodynamic characteristics of trains running in different high beam are discussed, finally, this thesis presents the changing regularity of aerodynamic coefficients of vehicles in different wind yaw angle, which can provide for the studying of dynamic responses of train moving on bridge under the crossing wind and analyzing running safety and riding comfort of vehicles.4.A simulation analyzes on the aerodynamic characteristics of each other when two high-speed trains passing each other researched by dynamic grid technology in the static wind and different velocity of crossing wind, then this thesis summarizes the changing regularity of aerodynamic coefficients of vehicles.