Optimization Design of Streamline Drag Reduction for Heavy-Duty Buses Based on Fluent

Qi Hong Tang, Yan Zuo Chang, Yong Seng Huang, Ruo Yu Yang, Liu Yi Yu, Jian Ting Lai, Tian Yi Miao, Ying Shan Guo

large buses, Computational Fluid Dynamics, drag coefficient, external design, Fluent

In recent years, the global petroleum energy crisis has driven the automotive manufacturing industry to focus on reducing the aerodynamic drag coefficient through optimized design to improve fuel economy, and this demand is particularly prominent in the field of large buses. This paper takes three large buses with different shapes as the research objects, and explores the variation law of their aerodynamic characteristics through streamlined modification of the body shape. In the study, first, a 3lD base model of the large bus was constructed, and three groups of large bus models with different shapes were generated by adjusting the shape parameters. Subsequently, under unified boundary conditions (such as inflow velocity, ambient pressure, etc.), computational fluid dynamics (CFD) methods were adopted, and simulation experiments were carried out with the help of Fluent software. Data such as gas flow field diagrams of each group of models were obtained through numerical simulation, and the influence of different shapes on the aerodynamic drag coefficient was compared and analyzed.The results show that large buses with streamlined designs at the front and rear have better aerodynamic characteristics, and the effect in reducing the drag coefficient is more significant. At the same time, this study can provide a reference basis for the aerodynamic optimization design of large buses.

Received: 29 Jul 2025, Received in revised form: 31 Aug 2025, Accepted: 03 Sep 2025,

10.22161/ijaers.129.1