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Granular Matter

, 20:4 | Cite as

Study of sedimentation of non-cohesive particles via CFD–DEM simulations

  • Shan-lin Xu
  • Rui Sun
  • Yuan-qiang Cai
  • Hong-lei Sun
Original Paper

Abstract

The sedimentation process of granular materials exists ubiquitously in nature and many fields which involve the solid–liquid separation. This paper employs the coupled computational fluid dynamics and discrete element method (CFD–DEM) to investigate the sedimentation process of non-cohesive particles, including the hindered settling stage and the deposition stage. Firstly, the coupled CFD–DEM model for sedimentation is validated by the hindered settling velocity at different solid volume concentrations of suspension \(\phi _{0} \), i.e., \(\phi _0 =\) 0.05–0.6. Two typical modes of sedimentation are also presented by the concentration profiles and the equal-concentration lines. Then, the comparisons between mono- and poly-dispersed particle system are detailed. In the sedimentation of the poly-dispersed particle system, the segregation phenomenon is simulated. Furthermore, this segregation effect reduces with the increase of the initial solid concentration of suspension. From the simulations, the contact force between every pair of particles can be obtained, hence we demonstrate the “effective stress principle” from the view of the particle contact force by giving the correspondence between the particle contact force and the “effective stress”, which is a critical concept of soil mechanics. Moreover, the deposition stage can be simulated by CFD–DEM method, therefore the solid concentrations of sediment bed \(\phi _{\mathrm{max}} \) on different conditions are studied. Based on the simulation results of \(\phi _{\mathrm{max}} \) and the theory of sedimentation, this paper also discusses a method to calculate the critical time when sedimentation ends of two typical modes of sedimentation.

Keywords

Sedimentation Hindered settling CFD–DEM Effective stress Sediment bed density Critical time 

Notes

Acknowledgements

The research described here was funded by the National key research and development program funded by Ministry of Science and Technology, Grant Number is 2016YFC0800207; and the Projects of International Cooperation and Exchanges NSFC (National Natural Science Foundation of China), Grant Number is 51620105008.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Shan-lin Xu
    • 1
  • Rui Sun
    • 2
  • Yuan-qiang Cai
    • 1
  • Hong-lei Sun
    • 3
  1. 1.Research Center of Coastal and Urban Geotechnical Engineering, College of Civil Engineering and ArchitectureZhejiang UniversityHangzhouChina
  2. 2.Department of Aerospace and Ocean EngineeringVirginia TechBlacksburgUSA
  3. 3.Institute of Disaster Prevention Engineering, College of Civil Engineering and ArchitectureZhejiang UniversityHangzhouChina

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