Journal
COMPUTERS AND GEOTECHNICS
Volume 100, Issue -, Pages 30-51Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compgeo.2018.04.004
Keywords
Computational Fluid Dynamics (CFD); Discrete Element Method (DEM); Fictitious Domain (FD) method; Fine particle migration; Piping erosion
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Funding
- National Natural Science Foundation of China [51409036, 41572252, 51639002]
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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.
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