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https://hdl.handle.net/10356/99115
Title: | Flow and pollutant transport in urban street canyons of different aspect ratios with ground heating: large-eddy simulation | Authors: | Li, Xian-Xiang Koh, Tieh Yong Entekhabi, Dara Britter, Rex E. Norford, Leslie K. |
Issue Date: | 2012 | Source: | Li, X. X., Britter, R. E., Norford, L. K., Koh, T. Y., & Entekhabi, D. (2012). Flow and pollutant transport in urban street canyons of different aspect ratios with ground heating: large-eddy simulation. Boundary-layer meteorology, 142(2), 289-304. | Series/Report no.: | Boundary-layer meteorology | Abstract: | A validated large-eddy simulation model was employed to study the effect of the aspect ratio and ground heating on the flow and pollutant dispersion in urban street canyons. Three ground-heating intensities (neutral, weak and strong) were imposed in street canyons of aspect ratio 1, 2, and 0.5. The detailed patterns of flow, turbulence, temperature and pollutant transport were analyzed and compared. Significant changes of flow and scalar patterns were caused by ground heating in the street canyon of aspect ratio 2 and 0.5, while only the street canyon of aspect ratio 0.5 showed a change in flow regime (from wake interference flow to skimming flow). The street canyon of aspect ratio 1 does not show any significant change in the flow field. Ground heating generated strong mixing of heat and pollutant; the normalized temperature inside street canyons was approximately spatially uniform and somewhat insensitive to the aspect ratio and heating intensity. This study helps elucidate the combined effects of urban geometry and thermal stratification on the urban canyon flow and pollutant dispersion. | URI: | https://hdl.handle.net/10356/99115 http://hdl.handle.net/10220/12690 |
DOI: | 10.1007/s10546-011-9670-9 | Schools: | School of Physical and Mathematical Sciences School of Civil and Environmental Engineering |
Fulltext Permission: | none | Fulltext Availability: | No Fulltext |
Appears in Collections: | SPMS Journal Articles |
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