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DOI	10.1016/j.advwatres.2020.103642
	Unsaturated flow in a packing of swelling particles; a grain-scale model
	Sweijen T.; Hassanizadeh S.M.; Chareyre B.
发表日期	2020
ISSN	0309-1708
卷号	142
英文摘要	In this work, a grain-scale modelling technique is introduced for the simulation of unsaturated flow in deforming and swelling granular materials. To do so, a pore-scale model for unsaturated flow is coupled to the discrete element method (DEM). It is assumed that initially a dry packing of particles is quickly invaded by a liquid and becomes fully saturated. Particles start absorbing the liquid and this causes a rearrangement of particles, entrance of air into the packing, and a redistribution of the liquid (i.e. unsaturated flow). Flow was computed using a scheme of implicit pressure solver and explicit saturation update (IMPES), whilst particle movement was modelled using DEM. Simulations are continued until the packing is dry again. This is the first time that such a pore-scale model has been developed. We have used the model to investigate unsaturated flow during drying of a bed of swelling particles. Results indicated that the characteristic time scales of unsaturated flow and water absorption determine the swelling behaviour of the particle packing. © 2020
关键词	Finite difference method Granular materials Liquids Water absorption Characteristic time Grain-scale model Modelling techniques Particle movement Particle packings Pore-scale model Swelling behaviour Unsaturated flows Swelling absorption computer simulation discrete element method granular medium numerical model swelling unsaturated flow
语种	英语
来源机构	Advances in Water Resources
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/131766
推荐引用方式 GB/T 7714	Sweijen T.,Hassanizadeh S.M.,Chareyre B.. Unsaturated flow in a packing of swelling particles; a grain-scale model[J]. Advances in Water Resources,2020,142.
APA	Sweijen T.,Hassanizadeh S.M.,&Chareyre B..(2020).Unsaturated flow in a packing of swelling particles; a grain-scale model.,142.
MLA	Sweijen T.,et al."Unsaturated flow in a packing of swelling particles; a grain-scale model".142(2020).