Sand storms: CFD analysis of Reynolds stress and collision stress of particles near sand bed--颗粒学报PARTICUOLOGY

Zhang, Y., Yang, J., Liu, D., Wei, X., & Yu, L. (2010). Sand storms: CFD analysis of Reynolds stress and collision stress of particles near sand bed. Particuology, 8(4), 325-331. https://doi.org/10.1016/j.partic.2009.11.004

Sand storms: CFD analysis of Reynolds stress and collision stress of particles near sand bed

Yu Zhang, Jiecheng Yang, Dayou Liu^*, Xiaolin Wei, Lixin Yu

Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China

10.1016/j.partic.2009.11.004

Volume 8, Issue 4, August 2010, Pages 325-331

Received 19 May 2009, Revised 19 October 2009, Accepted 22 November 2009, Available online 8 June 2010.

E-mail: dyliu@imech.ac.cn

Highlights

Abstract

Sand storm is a serious environmental threat to humans. Sand particles are transported by saltation and suspension, causing soil erosion in one place and deposition in another. In order to prevent and predict sand storms, the causes and the manners of particle motions must be studied in detail. In this paper a standard k–ɛ model is used for the gas phase simulation and the discrete element method (DEM) is used to predict the movements of particles using an in-house procedure. The data are summarized in an Eulerian–Eulerian regime after simulation to get the statistical particle Reynolds stress and particle collision stress. The results show that for the current case the Reynolds stress and the air shear stress predominate in the region 20–250 mm above the initial sand bed surface. However, in the region below 3 mm, the collision stress must be taken into account in predicting particle movement.

Graphical abstract

Keywords

Particle Reynolds stress; Collision stress; Sand bed; DEM

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