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中文摘要：
以SAE汽车模型为研究对象，采用计算流体力学数值模拟方法研究非光滑表面布置位置对气动性能的影响。通过对SAE汽车模型的不同位置（侧部、底部、项部、前部、尾部）布置凹坑型非光滑表面，计算SAE汽车模型的空气阻力系数，比较光滑表面与非光滑表面的流线、速度矢量以及压力，分析非光滑表面气动减阻机理和减阻效果差异的原因，根据分析结果得到了合理且能够减阻的汽车非光滑表面布置位置。
英文摘要：
Based on SAE car model and using the computational fluid dynamics numerical simulation method, this paper mainly researched the influence that the different positions of non-smooth surfaces with decorating effect on the aerodynamic characteristics. By decorating pit type non-smooth surface on different positions of the SAE car model （sidepiece, bottom, top, front, rear）, calculating air drag coefficient and comparing streamline, velocity vector, and pressure between non-smooth surface and the smooth surface, this paper analyzed the reducing drag mechanism of non-smooth surface and the reasons for the differences. According to the results of analysis, we could reasonably obtain the position of non-smooth decorating surface which can reduce the drag coefficient.
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