Article ID Journal Published Year Pages File Type
293661 Journal of Wind Engineering and Industrial Aerodynamics 2012 8 Pages PDF
Abstract

We investigate the effect of flow unsteadiness on the mean wind flow pattern in an idealized urban environment. To that extent, steady RANS and unsteady LES simulations of the flow around a city-block are conducted for various ambient wind directions. Our simulations reveal that the selected modeling approach can have a significant effect on (i) the mechanisms causing air exchange between the regions above and below roof level, (ii) the spatial distribution of the time-averaged exchange fluxes, and (iii) the total amount of air exchange. For some specific cases, the modeling approach even has a larger impact on the predicted air exchange rate than the ambient wind direction. These results are of key-importance to researchers and engineers involved in simulations of flow in the urban neighborhood.

► Detailed comparison between steady RANS and unsteady LES simulations. ► Analysis of flow around a city-block for various ambient wind directions. ► Different modeling approaches show to favor different exchange mechanisms. ► The modeling approach might have more impact on the results than the wind direction.

Related Topics
Physical Sciences and Engineering Energy Renewable Energy, Sustainability and the Environment
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