The Aerodynamic Development and Computational Fluid Dynamics Accuracy Improvement of Geely Galaxy E8

As the first pure electric flagship sedan under the Geely Galaxy brand, a challenging aerodynamic target was set at the early stage of Geely Galaxy E8 for reducing electric power consumption and improving vehicle range. In response, the aerodynamic team formulated a detailed development plan and an overall drag reduction strategy. After conducting numerous loops of simulations and wind tunnel tests, along with continuous cross-disciplinary communication and collaboration, a product with outstanding aerodynamic performance was successfully developed. During the aerodynamic development of the E8, the primarily utilized steady-state simulations sometimes revealed significant discrepancies when compared to wind tunnel test results, particularly in schemes such as the air curtain, aerodynamic rims, and rear light feature optimizations. Some trends were even contradictory. Further investigations demonstrated that unsteady simulation methods captured different flow field information, indicating variations in flow separation regions and locations compared with steady method, which aligned more closely with the trends observed in wind tunnel tests. Therefore, employing transient analysis is recommended to enhance the accuracy of simulations and provide more reliable guidance for design optimization, especially in areas affected by flow separation, wheel rotation, and vehicle wake.