Improvement of semi-resolved CFD-DEM model for seepage-induced fine-particle migration: Eliminate limitation on mesh refinement

Author(s)
K. Cheng, M. Ahmad, Q. Yang, Y. Wang
Publisher
Elsevier
Source
Computers and Geotechnics
Keywords
Computational fluid dynamics, Discrete element method, Filter, Fine particle migration, Gaussian-based weighting function, Piping erosion
Year
2019

The semi-resolved CFD-DEM model, proposed in our previous paper (Cheng et al., 2018) for the modelling of seepage-induced fine-particle migration through coarse skeleton in gap-graded soils, is improved through using Gaussian-based weighting function for fine particle-fluid coupling based on locally averaging theory. By doing so, it eliminates the limitation on fine particle-fluid mesh size ratio and thereby facilitates capturing detailed flow pattern through the coarse skeleton by refining fluid meshes. The improved semi-resolved CFD-DEM model is validated by Particle Image Velocimetry results of velocity field of fine glass beads migration through a simple coarse skeleton.

Keywords: Discrete element method, Computational fluid dynamics, Gaussian-based weighting function, Fine particle migration, Piping erosion, Filter,

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