Effects of turbulent organized structures on gas dispersion in aurban area

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Large-eddy simulations were conducted to investigate mechanismof pollutant gas removal form urban canyons under neutral, stable and unstable thermalstratification. The result shows that the gas removal from the canyon is strongly relatedto the size of the low-momentum fluid, defined as a region in the flow where instantaneousstreamwise velocity is lower than the local mean velocity. Irrespective of the thermalstratification, the ejection which transports low-momentum fluid upward has influenceon pollutant removal from the canyon.