scholarly journals Discrete Element Method simulations of the saturation of aeolian sand transport

2015 ◽  
Vol 42 (6) ◽  
pp. 2063-2070 ◽  
Author(s):  
Thomas Pähtz ◽  
Amir Omeradžić ◽  
Marcus V. Carneiro ◽  
Nuno A. M. Araújo ◽  
Hans J. Herrmann
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Sand Transport ◽  
Aeolian Sand ◽  
Aeolian Sand Transport ◽  
Element Method

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

Processes ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 52
Author(s):  
Hongchao Dun ◽  
Peng Yue ◽  
Ning Huang ◽  
Jie Zhang
Keyword(s):  
Moisture Content ◽  
Discrete Element ◽  
Coastal Areas ◽  
Contact Forces ◽  
Sand Transport ◽  
Aeolian Sand ◽  
Moisture Condition ◽  
Surface Moisture ◽  
Aeolian Sand Transport ◽  
Long Time

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.

Discrete element method to model cracking for two layer systems

TAPPI Journal ◽  
2019 ◽  
Vol 18 (2) ◽  
pp. 101-108
Author(s):  
Daniel Varney ◽  
Douglas Bousfield
Keyword(s):  
Discrete Element Method ◽  
Flexural Modulus ◽  
Single Layer ◽  
Discrete Element ◽  
Flexural Stress ◽  
Layer System ◽  
Three Point Bending ◽  
Moving Force ◽  
Coating Layers ◽  
Element Method

Cracking at the fold is a serious issue for many grades of coated paper and coated board. Some recent work has suggested methods to minimize this problem by using two or more coating layers of different properties. A discrete element method (DEM) has been used to model deformation events for single layer coating systems such as in-plain and out-of-plain tension, three-point bending, and a novel moving force picking simulation, but nothing has been reported related to multiple coating layers. In this paper, a DEM model has been expanded to predict the three-point bending response of a two-layer system. The main factors evaluated include the use of different binder systems in each layer and the ratio of the bottom and top layer weights. As in the past, the properties of the binder and the binder concentration are input parameters. The model can predict crack formation that is a function of these two sets of factors. In addition, the model can predict the flexural modulus, the maximum flexural stress, and the strain-at-failure. The predictions are qualitatively compared with experimental results reported in the literature.

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