类车体外流场非稳态特性数值研究

摘要

The airflow around the Ahmed body with 30° slant angle has been simulated using LES. By statistically analyzing the computational results including drag force, lift force and 3D velocity, consulting the data belong to published reference; the computational method has been validated. The key conclusion is that with 0° yawing angle, the unsteady parameters of airflow around Ahmed body with symmetry geometry are not absolutely symmetrical.%采用大涡模拟的数值方法,对30°后倾角类车体外流场进行计算.对计算所得结果(阻力、升力、三维速度)进行统计分析,参考已发表文献数据,在证明计算方法有效性的基础上得出相关结论:在0°偏航角情况下,几何对称的类车体,其外流场非稳态参数并非完全对称.