Traffic-Induced Urban Pollution: A Numerical Simulation of Street Dispersion and Net Production

  • Jean-François Sini
  • Patrice G. Mestayer
Part of the NATO • Challenges of Modern Society book series (NATS, volume 22)


The CFD model CHENSI, based on the k-e two equation closure, including thermal buoyancy and scalar transport-diffusion, is first used to simulate the experiment of Cadle et al. (1976), allowing to deduce the turbulence produced by car motion. Then, a heuristic study of the streets capacity to ventilate the pollutants emitted by traffic, as a function of their geometrical and thermal properties, is presented from simulations of the flow and turbulent fields, the pollutant concentrations within the streets, and their fluxes to the atmosphere. Isothermal and non-isothermal simulations are presented, in the case when the street geometry corresponds in isothermal conditions to Oke’s (1988) skimming flow type. The wall heating is shown to induce different types of flow resulting in different pollutant distributions and net fluxes. The influence of the turbulence produced by cars on the pollutant dispersion is shown.


Street Canyon Wall Heating Urban Canopy Pollutant Dispersion Traffic Rate 
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Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • Jean-François Sini
    • 1
  • Patrice G. Mestayer
    • 1
  1. 1.Laboratoire de Mécanique des Fluides, UMR CNRS 6598 and SUB-MESOGroupement de Recherches CNRS 1102 Ecole Centrale de NantesNantesFrance

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