Aerodynamic Drag Optimization of Vehicle Rear Struc-ture Based on Isight

Yangyang Yuan, Furen Zhang

College of Mechanical and Vehicular Engineering, Chongqing Jiaotong University, Chongqing, 400074, China

Abstract: For the tail which has the greatest influence on the aerodynamic drag of the automobile, it is mod-ified based on the internationally accepted MIRA model and three-dimensionally modeled at CATIA. Fifteen sample points were selected by the optimal Latin hypercube for the three parameters. The semi-structured hexahedral mesh and the k-Omega SST model were selected to simulate the outward flow field of the modified car model. According to the calculated Results The RBF agent model was established. Finally, three parameters related to the tail structure were optimized by MIGA to reduce the Cd value of aerodynamic drag coefficient.

Keywords: rear type; MIRA model; Optimization Latin hypercube; proxy model; optimization algorithm; aerodynamic drag