Abstract
Large-eddy simulations are conducted to investigate the effects of the incoming turbulent structure of the flow on pollutant removal from an ideal canyon. The target canyon is a two-dimensional street canyon with an aspect ratio of 1.0 (building height to street width). Three turbulent flows upwind of the street canyon are generated by using different block configurations, and a tracer gas is released as a ground-level line source at the centre of the canyon floor. Mean velocity profiles for the three flows are similar, except near the roof. However, the root-mean-square values of the velocity fluctuations and the Reynolds shear stress increase with the friction velocity of the incoming turbulent flow. The spatially-averaged concentration within the canyon decreases with increasing friction velocity. Coherent structures of low-momentum fluid, generated above the upwind block configurations, contribute to pollutant removal, and the amount of pollutant removal is directly related to the size of the coherent structure.
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Michioka, T., Sato, A. Effect of Incoming Turbulent Structure on Pollutant Removal from Two-Dimensional Street Canyon. Boundary-Layer Meteorol 145, 469–484 (2012). https://doi.org/10.1007/s10546-012-9733-6
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DOI: https://doi.org/10.1007/s10546-012-9733-6