Large Eddy Simulation of Particle Transport and Deposition Over Multiple 2D Square Obstacles in a Turbulent Boundary Layer

Predicting solid particle transport in the lowest parts of atmosphere is a major issue for man-made obstacles semi-arid regions. Here, we investigate effects on saltation, square ground with different spacings. The aerodynamic field determined by large eddy simulations coupled an immersed boundary method obstacles. Solid particles are tracked Lagrangian approach. Take-off and rebound models introduced interaction wall. Without particles, fluid velocity profiles first compared experiments (Simoens et al., 2007, https://doi.org/10.1016/j.atmosenv.2007.08.013) showing good agreement. Special focus put recirculation zone that plays important role entrapment. Particle concentration fields presented. Accumulation zones studied regarding obstacle spacings as extension scheme Oke (1988, https://doi.org/10.1016/0378-7788(88)90026-6) to transport. A deposition peak appears before obstacle. When spacing between two enough, some trapped within second arises. streamwise evolution horizontal saltation flux shows downstream obtained highest separation. rate or estimated globally function spacing. These results illustrate how numerical tool developed here can be used assessing air quality terms concentration.