Numerical Simulation of the Influence of Additional Aerodynamic Devices on the Aerodynamic Drag of Van-Body Truck

摘要

With CFD software, the 3D flow field of a van-body truck and its aerodynamic drag coefficient are obtained based on numerical simulation. The Cd optimization of the truck is carried out by installing additional aerodynamic devices on the research above. Simulation results show that taper part installed on the tail of van postpones the flow separation, weakens tail vortex, and reduces the Cd. The wind deflector installed on the driver's cab minimizes the incoming flow that impacts the top of the van, especially the part higher than the driver's cab, and the airflow into the gap between driver's cab and van decreases, with lower pressure. As a result, the pressure drag of the driver's cab increases, while that of the van it decreases. And pressure drag of the whole vehicle is reduced with the Cd.