Flow and Deposit Characteristics of Submerged Granular Column Collapse under Different Densities Ambient Fluids

Abstract

The reservoir landslide is typically characterized by high-speed movement of a particle-fluid mixture, and its flow and deposit mechanisms are complex. This paper presents the mechanism of submerged granular column collapse under different densities ambient fluids based on coupled computational fluid dynamics and discrete element method (CFD-DEM) analysis. Important fluid-particle interaction forces, such as the drag force and the buoyancy, are considered by exchanging interaction forces between the CFD and DEM computations. We focus on the flow and deposit characteristics of submerged granular column collapse, namely the runout distance, the tail end height, the particle velocity, the energy, and deposit morphology, which are analyzed qualitatively and quantitatively. The change in fluid field caused by submerged granular column collapse and the formation of eddies are also discussed. A relatively dense fluid can significantly hinder the motion of granular flow, but can improve the conversion efficiency of kinetic energy from the vertical to the horizontal direction. Moreover, the eddies caused by fluid turbulence erode the surface of the granular pile, which is especially marked in a high-density fluid. The findings can provide vital theoretical support for the flow and deposit characteristics of granular flow under fluid and offer insights for the study of reservoir landslides.

Keywords

submerged granular column collapse / different densities ambient fluids / coupled CFD-DEM / flow characteristics / deposit morphology / landslides / hazards

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