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Article

Discrete Element Simulation on Sand-Bed Collision Considering Surface Moisture Content

by 1,2,†, 1,2, 1,3,4 and 1,2,*,†
1
Key Laboratory of Mechanics on Disaster and Environment in Western China, Lanzhou University, Lanzhou 730000, China
2
College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China
3
Key Laboratory of Service Environment and Intelligent Operation and Maintenance of Rail Transit, Lanzhou Jiaotong University, Lanzhou 730070, China
4
School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Joanna Wiącek
Processes 2022, 10(1), 52; https://doi.org/10.3390/pr10010052
Received: 20 November 2021 / Revised: 20 December 2021 / Accepted: 23 December 2021 / Published: 28 December 2021
(This article belongs to the Special Issue DEM Simulations and Modelling of Granular Materials)
The process of aeolian sand transport is an important mechanism leading to the formation and evolution of local landforms in coastal areas and desert lakes. For a long time, the role of surface moisture in incipient motion of sand grains by wind stress has been extensively studied but, in fact, sand-bed collision is the main mechanism in steady aeolian sand flow. At present, the lack of understanding of surface moisture content on sand-bed collision limits the application of aeolian sand transport models in wet coastal areas. In this paper, we adopt numerical simulations to discuss and analyze the effect of cohesive forces formed by surface moisture content on the sand-bed collision process based on discrete element method. High density contact forces appear with the surface moisture increasing, and form a closed structure around the edge of crater to resist the avulsion in horizontal direction. Under high moisture condition, even though the ejected sand grains saltate away from the surface, the tension forces will prevent from leaving. The ejected number trend with incident velocity shows some nonlinear characteristics due to the unequally distributed force chains and liquid bridges in the unsaturated sand bed surface. View Full-Text
Keywords: aeolian sand transport; sand-bed collision; water content; numerical simulation aeolian sand transport; sand-bed collision; water content; numerical simulation
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MDPI and ACS Style

Dun, H.; Yue, P.; Huang, N.; Zhang, J. Discrete Element Simulation on Sand-Bed Collision Considering Surface Moisture Content. Processes 2022, 10, 52. https://doi.org/10.3390/pr10010052

AMA Style

Dun H, Yue P, Huang N, Zhang J. Discrete Element Simulation on Sand-Bed Collision Considering Surface Moisture Content. Processes. 2022; 10(1):52. https://doi.org/10.3390/pr10010052

Chicago/Turabian Style

Dun, Hongchao, Peng Yue, Ning Huang, and Jie Zhang. 2022. "Discrete Element Simulation on Sand-Bed Collision Considering Surface Moisture Content" Processes 10, no. 1: 52. https://doi.org/10.3390/pr10010052

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