2020 Volume 37 Pages 19-26
Reducing the aerodynamic drag is essential for cutting CO2 emissions. However, the aerodynamic drag depends on the geometry of the vehicle, so both the aerodynamic performance and the design are necessary for the product development. We studied the Computational Fluid Dynamics (CFD) technique and aerodynamic drag reduction technology, focusing on the tire with rotation. First, we studied CFD validity of the flow around the tire with rotation, focusing on the tire shape and wheel rotation method. Secondly, we studied factors causing energy loss of flow by using the CFD, and achieved 3% Cd value reduction from the technology of previous generation. And, we adopted these new technologies on the aerodynamic development of CX-30. As a result, the vehicle achieved top level aerodynamic drag among the same class vehicles and realized the design concept.