Research on Vehicle Stability under Crosswind Conditions by Dynamic Coupling Method

Abstract

Abstract: For the study of vehicle stability under crosswind conditions, through the analyses of computational fluid dynamics(CFD) software FLUENT dynamic meshes and UDF, a dynamic coupling method was proposed combined with two-way coupling communication technology. The aerodynamics with vehicle dynamics was coupled. And the simulation results of dynamic coupling were compared with that of traditional static coupling. The influences of different wind speeds on vehicle crosswind stability were analyzed by dynamic coupling method.The calculation results indicate that vehicle stability under crosswind conditions by dynamic coupling method is worse than that by static coupling method, and the vehicle crosswind stability decreases with the increase of crosswinds.

Key words: dynamic coupling method, crosswind stability, aerodynamics, numerical simulation

摘要： 针对静态耦合方法对汽车侧风稳定性预测不足等问题，通过对流体仿真分析软件FLUENT中动网格及UDF技术的研究，结合双向耦合数据通信技术，提出了一种动态耦合数值仿真计算方法，实现了空气动力学与汽车动力学之间的动态耦合，并将该方法与静态耦合数值计算方法进行了对比分析。利用动态耦合数值计算方法分析了不同侧风风速条件对汽车侧风稳定性问题的影响，结果表明:动态耦合下汽车侧风稳定性较静态耦合下汽车侧风稳定性差；随侧风风速的增大,汽车侧风稳定性降低。

关键词: 动态耦合方法, 侧风稳定性, 空气动力学, 数值仿真

CLC Number:

U461.1

LUO Zexuan1;GU Zhengqi1,2;HUANG Taiming1;FENG Chengjie1;LI Shuya1. Research on Vehicle Stability under Crosswind Conditions by Dynamic Coupling Method[J]. China Mechanical Engineering.

罗泽轩1;谷正气1,2;黄泰明1;丰成杰1;李舒雅1. 汽车侧风稳定性动态耦合方法研究[J]. 中国机械工程.

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