吉林大学学报(工学版) ›› 2017, Vol. 47 ›› Issue (3): 731-736.doi: 10.13229/j.cnki.jdxbgxb201703006

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Aerodynamic drag of heavy duty vehicle with complex underbody structure

LI Ming-da1, 2, KUI Hai-lin1, MEN Yu-zhuo2, BAO Cui-zhu1   

  1. 1.College of Transportation, Jilin University, Changchun 130022, China;
    2.School of Mechatronics Engineering, Changchun Institute of Technology, Changchun 130012, China
  • Online:2017-05-20 Published:2017-05-20

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Abstract: The aerodynamic drag of five axes heavy duty vehicle with complex underbody structure was studied. The model with the real vehicle structure shape was established. Then, the macroscopic behavior of fluids in external flow field was simulated using the computational fluid dynamics software XFlow, which is based on Lattice Boltzmann Method. The air resistance coefficient of the whole vehicle model was obtained by lattice scale optimization test, and the influence of the underbody structure on the aerodynamic drag was investigated. The vehicle surface pressure distribution, the surface velocity field of the rotating wheels, the velocity distribution in the external flow field of the model, the turbulence intensity distribution, and the particle trajectories under the vehicle were analyzed. Results show that the drag coefficient error of the truck model is within 6%. Through the underbody structure optimization, the aerodynamic drag coefficient of the whole vehicle model can be reduced by 23%.

Key words: engineering of communications and transportation system, heavy duty vehicle, lattice Boltzmann method, XFlow, air resistance coefficient

CLC Number: 

  • U461.8
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