A semi-resolved CFD-DEM model for seepage-induced fine particle migration in gap-graded soils

Author(s)
K. Cheng, Q. Yang, Y. Wang
Publisher
Elsevier
Source
Computers and Geotechnics
Keywords
Computational fluid dynamics (CFD), Discrete Element Method (DEM), Fictitious Domain (FD) method, Fine particle migration, Piping erosion
Year
2018

A semi-resolved CFD-DEM model is proposed to model the seepage-induced fine particle migration within the gap-graded soils consisting of fine and coarse particles. In this model, a resolved method, i.e., Fictitious Domain (FD) method is used to resolve the fluid flow around the coarse particles and the un-resolved approach based on the locally averaging theory is adopted to describe the interactions between the fine particles and the fluid flow for the computational efficiency. The semi-resolved CFD-DEM model is validated using several simple examples and is further used to analyze the fine particle migration and associated piping erosion in gap-graded soils.

Keywords: Computational Fluid Dynamics (CFD), Discrete Element Method (DEM), Fictitious Domain (FD) method, Fine particle migration, Piping erosion