湖南大学学报（自然科学版）2016，Vol.43Issue(4)：52-58,7.
车身俯仰运动时流场的迟滞现象研究∗
Study on the Hysteresis Effects of Flow-field around Road Vehicle Subj ected to Pitching Motion
摘要
Abstract
This paper studied the transient flow-field response of a simplified vehicle pitching around its front axle.The transient numerical solver employed is based on the large-eddy simulation.The sinusoidal-pitching motion was imposed on the model,and the Strouhal number was 0.13.The numerical method was validated with wind-tunnel experiments.The change rule of the results between transient simulation and quasi-steady simulation is quite large.It has been found that the quasi-steady simulation cannot repro-duce the aerodynamics performance of vehicle driving on road.It has also been found that,from the transi-ent simulation results,there is a time lag at the extreme position,which suggests that the flow-field has hysteresis effects.The complex flow-field of transient flow around the road vehicle was thoroughly under-stood from the space and time through the Q-criterion to identify the coherent structures of the flow.关键词
大涡模拟/俯仰运动/迟滞/气动力/Q-准则Key words
large eddy simulation (LES)/pitching motion/hysteresis/aerodynamic force/Q-criterion分类
交通工程引用本文复制引用
黄泰明,谷正气,文琪,陈阵,唐江明..车身俯仰运动时流场的迟滞现象研究∗[J].湖南大学学报（自然科学版）,2016,43(4):52-58,7.基金项目
中央财政支持地方高校专项资金资助项目(0420036017) （0420036017）
国家高技术研究发展计划(863计划)资助项目(2012AA041805) （863计划）
湖南大学汽车车身先进设计制造国家重点实验室自主课题资助项目(734215002) （734215002）
