Numerical study of unsteady flowfield around high speed trains passing by each other

In order to study unsteady flowfield around high speed trains passing by ea ch other, a three-dimensional inviscid numerical method based on three type s of domain decomposition techniques is developed. Roe's FDS scheme is used for the space discretization, and LU-SGS method is adopted for the time in tegration. After validation of the code to a single track train/tunnel inte raction problems with three dimensional tunnel configuration, the numerical simulations of the trains passing by on the double-track are performed for the 5 different cases using 3 basic parameters; e.g. nose shape, existence of tunnel, and train length. After the parametric study, variational param etric studies are carried out to understand the effects of the velocity of the train, the gap between the train and the blockage ratio. Firstly, train /tunnel interaction problems for double track railway system are investigat ed and aerodynamics toads histories during the crossing events-train/train interaction problem- are presented and discussed.