Coupled Fluid-Particle Modeling of Submerged Granular Collapse
We perform coupled fluid-particle modeling to understand the collapse of underwater granular columns in comparison with dry cases, with a variety of initial aspect ratios. Our results show that the submerged collapse leads to a shorter runout and thicker front due to the resistance provided by the ambient fluid. An interesting process of vortex formation is observed in the fluid as particles turn into a shear flow. At high aspect ratios, the vortex in water can significantly modify the surface morphology of the final deposit due to the fluid inertia developed on the surface of the granular layer.
KeywordsCFD-DEM Granular collapse Submerged granular flow
The work was supported by Research Grants Council of Hong Kong (under Grant No. RGC/GRF 17203614), and FAP-DF, Brazil. The research was conducted in part using the research computing facilities and advisory services offered by Information Technology Services, the University of Hong Kong.
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