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摘要
Based on the direct forcing immersed boundary method, this paper presents numerical simulations of the movement of the double columnar particles in a three-dimensional linear shear flow to study the movement state and force of columnar particles.The aspect ratios of the double columnar particles are 2, and the initial distance between the particles ΔSPy is 4D.According to the simulation results, the parameter distribution of the flow around the columnar particles is obtained.The changes in force and movement of the columnar particles as well as the law of the movement and rotation of the particles caused by the fluid drag force are studied, considering the influence of wall on particles and the mutual influence between the two particles.Results show that the double columnar particles tend to move towards the high-speed area in a linear shear flow.The movement and trajectory of the two particles are different.The drag force fluctuations are greater if the distance between the particles is relatively close.The lagging particle can catch up with the leading particle when they move near the wall, and the drafting, tumbling and separating occur. ? 2023 Editorial Office of Chinese Journal of Computational Mechanics.
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