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Publisher DOI: 10.1002/nag.3131
Title: The influence of the void fraction on the particle migration: a coupled computational fluid dynamics–discrete element method study about drag force correlations
Language: English
Authors: Kanitz, Manuela 
Grabe, Jürgen 
Keywords: CFD–DEM; drag force correlations; granular matter; internal erosion; suffusion
Issue Date: 2021
Publisher: Wiley
Source: International Journal for Numerical and Analytical Methods in Geomechanics 1 (45): 45-63 (2021)
Abstract (english): 
Granular soils subjected to flow through their soil skeleton can show a behaviour in which fine particles migrate through the pore space between coarser particles. This process is called internal instability or suffusion. This contribution deals with the numerical analysis of the migration of fine particles in a soil column subjected to fluid flow with unresolved coupled computational fluid dynamics–discrete element method (CFD–DEM) with special regards to the used drag force correlation. The contribution investigates the influence of the Schiller–Naumann model and its extension with a voidage term on the migration behaviour of fine particles. The voidage term is further varied with a parameter, which controls the impact of the change of the void fraction on the drag force. It could be observed that the Schiller–Naumann model does not yield in a suffusive behaviour while the extended models show significant particle migration. Thereby, increasing the impact of the void fraction on the drag force results in stronger particle migration. These results reveal the need for good validation techniques. They indicate how the drag force correlation can be adapted to depict the correct particle migration behaviour.
DOI: 10.15480/882.3188
ISSN: 0363-9061
Journal: International journal for numerical and analytical methods in geomechanics 
Institute: Geotechnik und Baubetrieb B-5 
Document Type: Article
Project: Multiskalenmodellierung physikalischer Vorgänge an der Grenzschicht Wasser/Boden 
Projekt DEAL 
More Funding information: The authors thank the German Research Foundation (DFG) and the Austrian Science Fund (FWF) for supporting this project (DACH project). This work is part of the project No. 274844490.
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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