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The influence of the void fraction on the particle migration: a coupled computational fluid dynamics–discrete element method study about drag force correlations
Citation Link: https://doi.org/10.15480/882.3188
Publikationstyp
Journal Article
Date Issued
2021
Sprache
English
Author(s)
Institut
TORE-DOI
TORE-URI
Volume
45
Issue
1
Start Page
45
End Page
63
Citation
International Journal for Numerical and Analytical Methods in Geomechanics 1 (45): 45-63 (2021)
Publisher DOI
Scopus ID
Publisher
Wiley
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.
Subjects
CFD–DEM
drag force correlations
granular matter
internal erosion
suffusion
DDC Class
550: Geowissenschaften
690: Hausbau, Bauhandwerk
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.
this project (DACH project). This work is part of the project No. 274844490.
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