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Journal of Hydrodynamics

, Volume 18, Issue 1, pp 144–148 | Cite as

Numerical study on flow and dispersion in urban street canyons of asymmetrical configurations

Session B2

Abstract

A study was carried out by using the numerical simulation method to obtain the total concentration of a specific objective street canyon for different layouts with the different aspect ratio of Hd/Hu (windward-building-height-to-leeward-building-height) under a specific street width. It is shown that the concentration distributions and the total concentration values are strongly dependent on the number and rotating direction of vortices within and out of the street canyon due to the variation of geometric configurations of the street canyon. The preliminary study for the limited street canyon configuration shows that there may exist a critical aspect height ratio to make the total concentration of the specific street canyon be small. Generally the strong step-down canyon is a good layout relative to the other types.

Key words

street canyon numerical simulation vehicular emission 

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Copyright information

© China Ship Scientific Research Center 2006

Authors and Affiliations

  1. 1.School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghaiChina

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