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

K. Cheng, M. Ahmad, Q. Yang, Y. Wang
Computers and Geotechnics
Computational fluid dynamics, Discrete element method, Filter, Fine particle migration, Gaussian-based weighting function, Piping erosion

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,

Access Full Text