Numerical study on the aerodynamics of the Ahmed body and drag reduction analysis

Abstract

At present, the vehicle is still an important means of transportation for human beings. Appropriate reduction of vehicle aerodynamic drag can effectively reduce fuel consumption. In this report, the aerodynamics analysis of the Ahmed body for the slant angles of 25º and 35º was presented numerically, and the average lift/drag was compared with the previous result. The average lift and drag were carried out, and the streamlines and volume vorticity structures were presented to reveal the relationship between aerodynamics and the flow field structure. In addition, two configurations of cylinder vortex generations were added to the Ahmed body for which the slant angle is 35º. It was found that, by applying the cylinder vortex generations, the results show a 10% reduction in drag coefficients compared to the baseline structure. The presented results provide an effective way for the drag reduction design of vehicles with the Ahmed body.