高速列车行驶是一个车-线-网-气流强耦合的复杂大系统，强风沙环境下运行的高速列车其稳定性、安全性及舒适性等会受到很大的影响，随着列车的高速化和轻量化的发展，这种问题越来越突出。本项目采用流固双向耦合联合数值模拟方法对高速列车在西部强风沙环境下运行的动力学性能进行研究，主要包括对风沙流进行无网格粒子离散求解，对高速列车进行网格细化，以及对风沙流和列车的相互影响进行强耦合等，以探索风沙流对高铁系统中列车、铁轨等的作用机理，模拟风沙流通过高铁防风栅以及对列车的空气动力学产生影响的整个过程，阐明高铁的强风沙作用机制，揭示风沙流结构的动力学特征及对高速列车的影响规律，并通过风沙流与防风栅的互馈对现有防风栅的防阻沙效果进行数值分析和实验研究，总结各种参数和形态的防风栅的防阻沙效率，对其进行参数优化或结构改造以得到具有更好防阻沙效果的防风栅，以适应西部高速列车的运行环境，为铁路防阻沙工程提供科学依据。

The high speed train is a complex system coupling vehicle, track, airflow and network, whose stability, safety and comfort will be greatly affected confronting badly blown sand environment and with the development of the high-speed and light-weight train, this problem is becoming more and more serious. In this project, a fluid-solid two-phase coupling joint numerical simulation method is presented to study the dynamic performance of high speed train when running in strong blown sand environment in western China. The study, which consists of solving mesh-less particle discrete solution for wind-blown sand, refining mesh of the high-speed train and coupling the interaction between wind-blown sand and train, is applied to explore the mechanism of how the wind-blown sand work on the vehicle, track and other things incorporated in the high-speed system, simulate the process of how the wind-blown sand go through the wind fence on railway and how it affects the aerodynamics of the train, illustrate the strong wind-blown sand working mechanism of high-speed trains, reveal the dynamic characteristics of wind-blown sand structure and its influence on high-speed trains. To sum up the effect of various parameters and shapes of wind fences on the sand control efficiency and optimize its parameters or structure to get a wind fence with better wind-blown sand defense effect, the numerical analysis and experimental study was carried out based on wind-blown sand defensing efficiency of the wind fence , so it can work better for the operation of the high speed train in western China and provide the railway wind-blown sand defensing project with a scientific support.