【摘 要】
：
With CFD software, the 3-D 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
【机 构】
：
School of Automotive Studies,Tongji University
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With CFD software, the 3-D 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 drivers cab minimizes the incoming flow which impacts the top of the van, especially the part higher than the drivers cab, and the airflow into the gap between drivers cab and van decreases, with lower pressure.So the pressure drag of the drivers cab increases while it decreases that of the van.And pressure drag of the whole vehicle is reduced with the Cd.
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