侧风对轿车气动特性影响的稳态和动态数值模拟对比研究  

A Study on the Comparison Between Steady and Dynamic Numerical Simulations of the Crosswind Effects on Car Aerodynamic Characteristics

作　　者：王夫亮[1] 胡兴军[1] 杨博[1] 傅立敏[1] 

机构地区：[1]吉林大学汽车工程学院,长春130022

出　　处：《汽车工程》2010年第6期477-481,共5页Automotive Engineering

基　　金：国家自然科学基金项目(60222207);吉林大学‘985’工程项目资助

摘　　要：分别采用稳态方法和基于动网格技术的动态方法对侧风作用下的汽车外流场进行了3种情况的数值模拟,将3种模拟结果进行对比,同时将部分模拟结果与试验值进行了对比。结果表明合理选用数值模拟方案可获得较满意的计算结果;地面边界层对计算结果影响较大;稳态方法和动态方法的流场分布、阻力系数和升力系数以及较弱侧风条件下的侧向力系数有较好的一致性,强侧风条件下的侧向力系数则差别较大。Three different numerical simulations on the exterior flow field around a car under the effect of crosswind are conducted respectively with both steady method and dynamic method based on moving mesh tech- nique, and the results are compared to each other and with test one. The results show that satisfying results can be obtained with proper scheme of numerical simulation and the ground boundary layer has significant effect on simula- ted results. For the distribution of flow field, drag coefficient, lift force coefficient, and side force coefficient under weak crosswind, the results are in good agreement with each other, but an apparent discrepancy can be found for side force coefficient under strong crosswind.

关 键 词：汽车空气动力学 侧风 稳态数值模拟 动态数值模拟 地面边界层效应 

分 类 号：U461.1[机械工程—车辆工程]