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首页> 外文期刊>Physical review, E >Particle velocity distributions and velocity fluctuations of non-Brownian settling particles by particle-resolved direct numerical simulation
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Particle velocity distributions and velocity fluctuations of non-Brownian settling particles by particle-resolved direct numerical simulation

机译：通过粒子分辨的直接数值模拟颗粒速度分布和非褐色沉降粒子的速度波动

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摘要

Settling dynamics of non-Brownian particles is investigated using particle-resolved direct numerical simulations. There are two aims of this paper: first is to study the variation of particle velocity fluctuations with solid volume for a wide range of settling Reynolds number; second is to investigate the effects of solid volume fraction and settling Reynolds number on the distribution of particle velocity fluctuations after reaching the steady state. Simulations are performed in the periodic domain and the settling Reynolds number and solid volume fraction are varied from 0.5 to 400 and 0.01 to 0.2, respectively. It is observed that particle velocity fluctuations increase with increase in solid volume fraction for settling Reynolds number less than 100. Further increase in the settling Reynolds number alters the behavior of settling particles, making the particle velocity fluctuations either remain nearly constant or even decrease with the increase in solid volume fraction. For dense suspensions, it is observed by simulations that the distribution of particle velocities has Gaussian form during settling. However, for dilute and moderately dense suspensions, particle velocity distribution becomes non-Gaussian for the studied range of settling Reynolds number. At the end of paper, the physics behind the scaling of particle velocity fluctuations with solid volume fraction and the distribution of particle velocity fluctuations during settling is explained.
机译：使用粒子分辨的直接数值模拟研究了非褐色颗粒的沉降动态。本文有两个目的：首先，研究颗粒速度波动的变化，具有固体体积的各种沉降雷诺数;其次是研究固体体积分数和沉降雷诺数对达到稳态后颗粒速度波动分布的影响。在周期结构域中进​​行模拟，并且沉降的雷诺数和固体体积分别在0.5至400和0.01至0.2中变化。观察到颗粒速度波动随着沉降雷诺数小于100的固体体积分数而增加。沉降雷诺数的进一步增加改变了沉降颗粒的行为，使颗粒速度波动仍然几乎恒定甚至减少增加固体体积分数。对于致密的悬浮液，通过模拟观察到颗粒速度分布在沉降期间具有高斯形式。然而，对于稀释和中等致密的悬浮液，粒子速度分布变为用于研究的沉降雷诺数范围的非高斯。在纸结束时，解释了具有固体体积分数的粒子速度波动和沉降期间粒子速度波动分布的物理。

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