Abstract
In order to explore the cause of particle resuspension by footsteps, a footstep motion model was developed. The transient calculation method is used to simulate the resuspension of particles around footsteps. The particles are tracked by Discrete Random Walk (DRW) model based on Lagrange method. The Discrete Phase Model (DPM) is used to release particles in the simulation. The vortex, velocity vector, streamline diagram and particle motion were analyzed by numerical simulation. The results show that the footsteps cause resuspension of particles. At high footstep velocity, vortices are generated. The vortices occur at the periphery of the footsteps, and the air flow in the whole space is more symmetrical. Over time, during the whole footsteps, the vortices experience the process of occurrence, growth and annihilation. Due to the vortex in the air, the particles originally deposited on the ground will resuspend.
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