NDLI: Investigation of granular batch sedimentation via DEM

Content Provider	Springer Nature Link
Author	Zhao, T. Houlsby, G. T. Utili, S.
Copyright Year	2014
Abstract	This paper presents three dimensional numerical investigations of batch sedimentation of spherical particles in water, by analyses performed by the discrete element method (DEM) coupled with computational fluid dynamics (CFD). By employing this model, the features of both mechanical and hydraulic behaviour of the fluid-solid mixture system are captured. Firstly, the DEM–CFD model is validated by the simulation of the sedimentation of a single spherical particle, for which an analytical solution is available. The numerical model can replicate accurately the settling behaviour of particles as long as the mesh size ratio $$\left( {{D_{mesh} }/d} \right) $$ and model size ratio $$\left( {W/{D_{mesh} }} \right) $$ are both larger than a given threshold. During granular batch sedimentation, segregation of particles is observed at different locations in the model. Coarse grains continuously accumulate at the bottom, leaving the finer grains deposited in the upper part of the granular assembly. During this process, the excess pore water pressure initially increases rapidly to a peak value, and then dissipates gradually to zero. Meanwhile, the compressibility of the sediments decreases slowly as a soil layer builds up at the bottom. Consolidation of the deposited layer is caused by the self-weight of grains, while the compressibility of the sample decreases progressively.
Starting Page	921
Ending Page	932
Page Count	12
File Format	PDF
ISSN	14345021
Journal	Granular Matter
Volume Number	16
Issue Number	6
e-ISSN	14347636
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-11-12
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Granular batch sedimentation DEM–CFD coupling Segregation Pore water pressure Effective stress Compressibility Soft and Granular Matter, Complex Fluids and Microfluidics Engineering Fluid Dynamics Materials Science Geoengineering, Foundations, Hydraulics Industrial Chemistry/Chemical Engineering Engineering Thermodynamics, Heat and Mass Transfer
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mechanics of Materials Materials Science

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