Title: Numerical simulation of turbulent dispersion on a two-way facing traffic road

Authors: Ryusuke Yasuda, Takeyuki Miyajima, Atsumasa Yoshida

Addresses: Department of Mechanical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan. ' Department of Mechanical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan. ' Department of Mechanical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan

Abstract: A Large Eddy Simulation (LES) model was developed to investigate vehicle-induced turbulence and its effect on turbulent dispersion. The instantaneous behaviour of vehicle exhausts and the time-space averaged distributions of flow and concentration statistics on the roadway were estimated. The patterns of mean flow are significantly different between the one-way and the two-way traffic cases. In the vehicle passing area, the standard deviations of the spanwise and the vertical fluctuation velocities are two times larger than the maximum of the mean velocity. The relationship between the growth rate of vertical plume width and the background cross flow was also investigated.

Keywords: roadside environment; air pollution; LES; large eddy simulation; vehicle induced turbulence; sliding mesh method; vertical plume width; air quality; numerical simulation; turbulent dispersion; vehicle exhausts; traffic emissions.

DOI: 10.1504/IJEP.2011.038415

International Journal of Environment and Pollution, 2011 Vol.44 No.1/2/3/4, pp.164 - 172

Published online: 07 Feb 2011 *

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