Unraveling the Generation and Destruction Mechanisms of Arch Vortices in Urban Fluid Flows: A Comprehensive Analysis
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Our study employs higher-order dynamic mode decomposition to analyze a high-fidelity database of turbulent flow in an urban environment featuring two buildings separated by a certain distance. Through our analysis, we were able to identify and document the generation and destruction mechanisms of the well-known arch vortex forming on the leeward side of the first building, which may play a significant role in the dispersion of pollutants. Our findings demonstrate that the arch vortex’s formation leads to an increase in pollutant concentration, highlighting the crucial importance of the reported mechanisms in promoting urban sustainability.