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Mathematical Problems in Engineering
Volume 2015 (2015), Article ID 879735, 10 pages
Research Article

Effect of Car Rear Shape on Pollution Dispersion in Near Wake Region

State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, Jilin Province 130022, China

Received 19 March 2015; Revised 22 June 2015; Accepted 13 July 2015

Academic Editor: Francesco Braghin

Copyright © 2015 Xing-Jun Hu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Dispersion of vehicle exhaust gas is a primary source of air pollution in urban areas. Thus, it has become an important subject in the automotive field. This paper consists of two parts. First, the fastback MIRA model was selected as study object and a standard two-equation turbulence model was used. The simulation results were compared and analyzed with experimental data. The feasibility of the turbulence model and grid strategy was then verified, and the results were used in the next research step. Second, we used propane as tracer gas while ignoring the effect of the vehicle wake field force on this gas. The tracer gas diffusion in the wake flow field was then simulated through fastback, notchback, and square-back MIRA models. This study focuses on analyzing the characteristics of wake field diffusion effects, particularly in the near wake of a vehicle.