Abstract
In this paper, erosion of sediment bed is simulated numerically based on CFD-DEM coupled method. Fluid phase is simulated through computational fluid dynamics (CFD) approach. Such simulation is conducted by solving locally averaged Navier-Stokes equation in CFD solver. The particles are simulated through discrete element method (DEM). The interaction between fluid and particles is considered with an unresolved approach by exchanging the information of interaction forces between the CFD and DEM computation process in CFDEM. Drag force and buoyancy force are considered in this study. The coupling model is first applied to a particle settling test to investigate its performance and the sensitivity of grid size. After benchmarking, the tool is employed to simulate an erosion experiment involving 20000 particles. The results help to describe the erosion pattern of a sediment bed.
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