Journal of Jilin University(Engineering and Technology Edition) ›› 2026, Vol. 56 ›› Issue (7): 1780-1786.doi: 10.13229/j.cnki.jdxbgxb.20241290

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Effect of negative⁃pressure design on aerodynamic drag of DrivAer car model

Ming LI1,2,3(),Shang-yi ZHAO2,Hai-jun XU2,Qing GAO3,Xin CHEN3,Guo-feng QIN1   

  1. 1.Engineering Research Center for Intelligent Agriculture & Forestry Equipment Technology of Guangxi Universities，Guangxi Normal University，Guilin 541006，China
    2.Postdoctoral and External Expert Workstation，Guangxi Automobile Group Co. ，Ltd. ，Liuzhou 545027，China
    3.State Key Laboratory of Automobile Simulation and Control，Jilin University，Changchun 130022，China
  • Received:2024-12-02 Online:2026-07-01 Published:2026-08-12

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Abstract:

The practical drag reduction effect of negative-pressure surfaces on real vehicles was investigated， RANS simulations based on the DrivAer vehicle model were adopted to comparatively analyse the aerodynamic drag and flow field characteristics of the negative-pressure configuration model and the smooth configuration model， and the inner mechanism of drag reduction was analyzed based on the three-dimensional structures of recirculation zones and recirculating vortices. The results show that non-smooth surfaces might not be capable of producing drag reduction over the full Reynolds number range. At low Reynolds number， a drag reduction of 2.1% is achieved， but at high Reynolds number， the drag increase by non-smooth surface itself could not be compensated by the drag reduction through weakening recirculating vortices in the rear of the vehicle， resulting in an increase in the overall drag.

Key words: vehicle engineering, DrivAer, drag reduction, negative-pressure design, vortical structures, passenger car

CLC Number: 

  • U461.1

Fig.1

DrivAer car model and its negative-pressure design"

Fig.2

Schematic scheme of numerical tunnel for DrivAer model"

Fig.3

Gridding design for DrivAer model"

Table 1

Detail information for cases"

算例造型速度/（m·s-1）雷诺数/106
S12光滑造型41.22
S24光滑造型82.34
S48光滑造型164.87
D12负压造型41.22
D24负压造型82.34
D48负压造型164.87

Table 2

Comparison of drag coefficients"

算例雷诺数/106阻力系数试验值误差/%仿真类型
S121.220.2530.257［16］-1.29RANS
S242.340.2510.248［16］0.99RANS
S484.870.2420.243［1］-0.23RANS

Fig.4

Effect of Reynolds number on drag coefficient"

Fig.5

Pressure coefficient profile in central plane"

Fig.6

Shape and streamlines of car-rear recirculation region"

Fig.7

2D Streamlines and vorticity in the central plane"

Fig.8

Effect of Reynolds number on recirculation region"

Fig.9

Distribution of total pressure coefficient"

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