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首页> 外文会议>World Congress on Particle Technology >Hindered Settling Velocity Structure formation during particle settling by Direct Numerical Simulation
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Hindered Settling Velocity Structure formation during particle settling by Direct Numerical Simulation

机译：直接数值模拟粒子沉降期间阻碍沉降速度和结构形成

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Direct numerical simulation is used to study the dynamics of particle settling for Reynolds number from 0.1 to 50 and solid volume fraction from single particle to 0.4. The principle investigations are the effects of Reynolds number and solid volume fraction on average settling velocity, velocity fluctuations and particles structuring during settling. It is observed that average settling velocity deviates from the well-known power law for dilute suspension and moderate range of Reynolds number. Moreover, the increase of velocity fluctuations with domain size saturates and becomes about constant for moderate range of Reynolds numbers in contrast to low Reynolds number in which the fluctuations keep increasing. These behaviors are due to the separated particle pairs which are formed due to inter-particle wake interactions. As the solid volume fraction increases, the smaller inter-particle distances diminish the wake effectsand corresponding particle structures.
机译：直接数值模拟用于研究从0.1至50的雷诺数和从单颗粒的固体体积分数的粒子沉降的动力学。原理研究是雷诺数和固体体积分数对平均沉降速度，速度波动和颗粒在沉降期间的效果。观察到，平均沉降速度偏离着众所周知的电力法，用于稀释悬浮液和中等范围的雷诺数。此外，与域尺寸的速度波动的增加饱和并且对于与低雷诺数保持不变的低雷诺数，恢复范围的恢复系数达到恒定。这些行为是由于由于颗粒间唤醒相互作用而形成的分离的粒子对。随着固体体积分数的增加，较小的颗粒间距减小了唤醒效果和相应的颗粒结构。

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