气候变化领域集成服务门户(CCPortal): Large Eddy Simulation of Particle Transport and Deposition Over Multiple 2D Square Obstacles in a Turbulent Boundary Layer

CCPortal

DOI	10.1029/2020JD034461
	Large Eddy Simulation of Particle Transport and Deposition Over Multiple 2D Square Obstacles in a Turbulent Boundary Layer
	Le Ribault C.; Vinkovic I.; Simoëns S.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:16
英文摘要	Predicting solid particle transport in the lowest parts of the atmosphere is a major issue for man-made obstacles in semi-arid regions. Here, we investigate the effects on solid particle saltation, of square obstacles on the ground with different spacings. The aerodynamic field is determined by large eddy simulations coupled with an immersed boundary method for the obstacles. Solid particles are tracked by a Lagrangian approach. Take-off and rebound models are introduced for the interaction of particles with the wall. Without particles, fluid velocity profiles are first compared with experiments (Simoens et al., 2007, https://doi.org/10.1016/j.atmosenv.2007.08.013) showing good agreement. Special focus is put on the recirculation zone that plays an important role in solid particle entrapment. Particle concentration fields are presented. Accumulation zones are studied regarding the different obstacle spacings as an extension of the aerodynamic scheme by Oke (1988, https://doi.org/10.1016/0378-7788(88)90026-6) to solid particle transport. A deposition peak appears before the first obstacle. When the spacing between the two obstacles is large enough, some particles are trapped within the recirculation and a second deposition peak arises. The streamwise evolution of the horizontal saltation flux shows that the lowest flux downstream of the obstacles is obtained for the highest separation. The deposition rate or the streamwise saltation flux are estimated globally as a function of obstacle spacing. These results illustrate how the numerical tool developed here can be used for assessing air quality in terms of solid particle concentration. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	boundary layer; deposition; large eddy simulation; saltation; solid particles; street canyon
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/237070
作者单位	LMFA UMR 5509, Ecole Centrale de Lyon, Université Claude Bernard Lyon 1, INSA Lyon, CNRS, Ecully Cedex, France
推荐引用方式 GB/T 7714	Le Ribault C.,Vinkovic I.,Simoëns S.. Large Eddy Simulation of Particle Transport and Deposition Over Multiple 2D Square Obstacles in a Turbulent Boundary Layer[J],2021,126(16).
APA	Le Ribault C.,Vinkovic I.,&Simoëns S..(2021).Large Eddy Simulation of Particle Transport and Deposition Over Multiple 2D Square Obstacles in a Turbulent Boundary Layer.Journal of Geophysical Research: Atmospheres,126(16).
MLA	Le Ribault C.,et al."Large Eddy Simulation of Particle Transport and Deposition Over Multiple 2D Square Obstacles in a Turbulent Boundary Layer".Journal of Geophysical Research: Atmospheres 126.16(2021).