Aerodynamic Shape Optimization of a Sedan Based on Approximate Model

Morphing surface mesh employing a parametric model for the aerodynamic shape optimization of a sedan is presented. This study solved the problem of non-linear deformation in modeling surface morphing by volume mesh, and solved the divergence problem due to bad mesh quality, using automatic grid generation method based on CAD model, in calculation. The optimization process consists of three stages: Design of Experiments (DOE), Approximate Model, and optimization algorithm execution. The optimization process was realized by an automatic optimization system consisting of multiple software platforms. The optimal model's aerodynamic drag coefficient is 10.56% decreased though optimization, and the hood is identified as the major factor in this research.