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该文利用三维格子玻耳兹曼-大涡模拟模型对不同雷诺数下(Re=5-2685)扁球体颗粒的静水沉降进行了模拟。结果表明,随着雷诺数的增加(颗粒增大),扁球体颗粒会经历五种沉降状态:稳定下落、阻尼摆动、周期摆动、混乱下落和斜线滚落,此颗粒运动形态与已有研究结果一致。并通过分析颗粒和周围流场的相互作用,即沉降过程中颗粒位移和受力以及颗粒对周围流场的影响,得到颗粒不同沉降运动形态的形成原因:雷诺数较小时,颗粒对流场扰动小,流线分布对称,流场对颗粒的作用力对称,合力作用线接近重心,合力矩也较小,颗粒运动形态较规则;雷诺数较大时,颗粒对流场的影响明显,流场分布紊乱,流场对颗粒作用力更加复杂,外力和外力矩都较大,颗粒运动形态较为不规则。
In this paper, the three-dimensional lattice Boltzmann-LES simulation model was used to simulate the hydrostatic deposition of oblate spherical particles with different Reynolds numbers (Re = 5-2685). The results show that as the Reynolds number increases (the particle size increases), the flat spherical particles undergo five sedimentation states: stable falling, damping swing, periodic swinging, chaotic falling and slanting roll. The particle morphology is similar to previous studies The result is the same. By analyzing the interaction between the particle and the surrounding flow field, ie, the displacement and the force of the particles in the sedimentation process and the influence of the particle on the surrounding flow field, we can get the formation reason of different sedimentation patterns of the particles: when the Reynolds number is small, Small, symmetrical streamlines, the flow field on the particle force symmetry, the synergistic action line close to the center of gravity, the moment of cooperation is also smaller, the particle morphology is more rules; larger Reynolds number particles, the particle flow field is obvious, the flow field Dispersed, the flow field on the particle force more complex, external forces and external torque are larger, particle movement is more irregular shape.