Abstract
In the present study, the numerical method based on Reynolds-averaged Navier Stokes equation and SST (Menter) k-ω turbulence model is adopted, and the discrete element method based on Hertz Mindlin (no slip) and Hertz Mindlin (no slip) with JKR contact model is coupled through the application programming interface to calculate the motion and distribution of sediment particles in ground effect. The accuracy of the flow field is verified by comparing with the experimental results of the thrust coefficient, the position of the tip vortex. Then, the dust cloud under different condition is calculated, the vorticity and velocity contour of the flow fields are compared with the outline of the dust clouds, the velocity and height distribution of the sediment particles with different sizes in the dust cloud are given, and the influence of the in ground effect on the motion and distribution of the sediment particles and the formation mechanism of the dust cloud are analyzed. The results show that most of the sediment particles in the flow can only creep on the ground, but cannot form dust cloud. The inner space of the dust cloud is mainly composed of smaller particles with higher average height. The larger particles are mainly distributed in the outer space with a lower average height.
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