Large-Eddy Simulation of Airflow and Pollutant Dispersion in a Model Street Canyon Intersection of Dhaka City

The atmospheric flow and dispersion of traffic exhaust were numerically studied in this work while considering a model street canyon intersection city. finite volume method (FVM)-based large-eddy simulation (LES) technique line with ANSYS Fluent have been used for pollutant modelling through the consideration boundary layer (ABL). Hexahedral elements are considered computational domain discretization order to solve problems using FVM-LES. turbulence parameters superimposed spectral synthesizer existing LES as part ’damage control’ due unsteady k−ϵ simulation. Initially, code is validated an experimental study urban where width height ratio unity. After validation, was investigated work. shows high concentration intersecting corner areas buildings. Additionally, level at leeward wall downwind building case increased upwind building. Most importantly, it realized from design that three-dimensional interconnection between dominating vortices roof plays pivotal role on windward walls. extent eddies their interconnections found be extremely important they facilitate enhanced ventilation. Corner only form streets towards freeway not intersection. results key findings offer qualitative quantitative data estimation, planning, implementation exposure mitigation environment.