Numerical studies on flow fields around buildings in an Urban street canyon and cross-road
- 292 Downloads
The questions on how vortices are constructed and on the relationship between the flow patterns and concentration distributions in real street canyons are the most pressing questions in pollution control studies. In this paper, the very large eddy simulation (VLES) and large eddy simulation (LES) are applied to calculate the flow and pollutant concentration fields in an urban street canyon and a cross-road respectively. It is found that the flow separations are not only related to the canyon aspect ratios, but also with the flow velocities and wall temperatures. And the turbulent dispersions are so strongly affected by the flow fields that the pollutant concentration distributions can be distinguished from the different aspect ratios, flow velocities and wall temperatures.
Key wordsstreet canyon separating flow turbulence dispersion numerical simulation
Unable to display preview. Download preview PDF.
- Pope, S. B., 2000:Turbulent Flows. Cambridge University Press, 771pp.Google Scholar
- Tate, J. E., and M. C. Bell, 2000: Evaluation of a traffic demand management strategy to improve air quality in urban areas.10th International Conference on Road Transportation Information and Control, London, UK, 158–162.Google Scholar
- Uehara, K., S. Murakami, S. Oikawa, and S. Wakamatsu, 1997a: Wind tunnel tests on stratified flow fields around urban street canyons by LDV.Journal of Architecture,492, 39–46.Google Scholar
- Uehara, K., S. Murakami, S. Oikawa, and S. Wakamatsu, 1997b: Wind tunnel test of concentration fields around street canyons within the stratified urban canopy layer.Journal of Architecture,499, 9–16.Google Scholar
- Vachon, G., J.-M. Rosant, P. G. Mestayer, P. Louka, and J.-F. Sini, 2000: Pollutant dispersion in an urban street canyon in Nantes: Experimental study.Proc. of the EUROTRAC-2 Symposium, Garmish-Partenkirchen, Germany, 1224–1227.Google Scholar
- Versteeg, H. K., and W. Malalasekera, 1995:An Introduction to Computational Fluid Dynamics. Longman Group Ltd., London, 257pp.Google Scholar