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