关键词: 计算流体力学, 扰流器, 阻力系数, FLUENT

Abstract: With the rapid development of computer technology, computational fluid dynamics (CFD) theory has been widely used in the process of automobile design and development. Based on the theory of computational fluid dynamics, this paper takes a sports car model as the research object, uses ANSA software for geometric cleaning and meshing, FLUENT software to solve the calculation of drag coefficient, and CFD-POST software to extract velocity vector diagram and pressure nephogram. Through simulation calculation, the different drag coefficients of the original model and a sports car model with different angle spoiler are obtained. At the same time, the causes of different drag coefficients are analyzed. The main reason for the different drag coefficients is that the existence of the spoiler delays the smooth convergence of the two airflow at the rear of the vehicle, resulting in the formation of a vortex area behind the spoiler at the rear of the vehicle. The larger the angle of the spoiler is, the larger the vortex area at the rear of the vehicle is, and the greater the drag coefficient is.

Key words: Computational fluid dynamics, Spoiler, Drag coefficient, FLUENT