CFD Modelling Of Traffic-related Air Pollutants
Around An Urban Street-canyon In Suzhou
Author(s)
F. Costabile, F. Wang, W. Hong, F. Liu & I. Allegrini
Abstract
The wind flow field around urban street-building configurations has an important
influence on the microscale pollutant dispersion from road traffic, affecting
overall dilution and creating localized spatial variations of pollutant
concentration. It is important to understand these small-scale effects not only for
assessing personal exposure to pollutants in the vicinity of roads, but also
because air quality in a city as a whole is assessed on the basis of data from a
few urban monitoring sites. This paper reports some outcomes of a study aimed
at exploring the transfer and diffusion characteristics of vehicular exhaust
emissions and the constraints associated with significant monitoring locations
such as street canyons, courtyards and enclosed spaces, and the conditions
propitious to pollutant diffusion and air dispersion in urban areas. The wind field
around a street-canyon in the city of Suzhou (China) has been modelled by using
the Computational Fluid Dynamic technique. The results have been analysed to
better understand the values of gaseous pollutants, meteorological parameters
and traffic flows measured by means of automatic analyzers along the same
street-canyon at two different heights. It has been found that the model correctly
describes the vortex recirculation pattern around the building geometry studied
and it is very useful in assessing the micro-scale pollution trends.
Keywords: street-canyon, Computational Fluid Dynamic, modelling, air
pollution, traffic emission.
1 Introduction
The wind flow field around urban street-building configurations has an important
influence on the microscale pollutant dispersion from road traffic, affecting
Keywords
street-canyon, Computational Fluid Dynamic, modelling, air
pollution, traffic emission.
Related Book
Other papers in this volume
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