Effect of Rear Spoiler Shape on Car Aerodynamics and Stability

Abstract

Computational dynamics is widely used when designing cars in order to obtain the optimum design and reduce the time and costs. Car design plays the main key in decision on purchasing the car. Car manufacturers have a very difficult task which is build a car that will be attracted potential buyers with its design, which does not deteriorate the car’s aerodynamics or has the stability at high level of speeds. In order to enhance the car’s stability, it’s necessary to add the rear spoilers to the car body. This paper presents deep study for effects of fitting different types of rear spoilers on the car’s aerodynamics and stability. Determination of corresponding aerodynamic drag and lift coefficients was performed using ANSYS software 14.5/Fluid Flow CFX module. It was found that the aerodynamic drag coefficient increased slightly with (3.4%) when fixed the rear spoilers, but a considerable reduction of the aerodynamic lift coefficient value (around 32%).