High-resolution simulation of particle transport in the urban atmospheric boundary layer

Abstract

This paper presents a model simulating the transport of particles of various sizes and masses in complex atmospheric boundary layer domains over urban areas by using a Lagrangian approach. The model takes input fields of air velocity and turbulence characteristics from various external RANS, LES, or DNS models (in this study, ENVI-met model is used), and includes a parameterization of subgrid stochastic velocity fluctuations. It allows us to estimate the movement of particles, their sedimentation, accumulation on the surface, and the variability of these processes depending on meteorological conditions. The results of test numerical experiments for aerosol transport over an idealized urban canopy are presented. The model has shown a good degree of qualitative conformity with the ENVI-met model.