Coupling irregular particles and fluid: Complex dynamics of granular flows
Coupling irregular particles and fluid: Complex dynamics of granular flows
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不规则颗粒与流体的耦合：颗粒流的复杂动力学
DOI：
10.1016/j.compgeo.2021.104624
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发表时间：
2022
影响因子：
5.3
通讯作者：
Tahmasebi, Pejman
中科院分区：
文献类型：
--
作者：
Zhang, Xiaoming;Tahmasebi, Pejman
自然界中经常遇到颗粒材料，但当它们伴随流体时，其形态特性的影响却知之甚少。这组复杂性将惯性力、粘性力、摩擦力和弹性力结合在一起，其联系仍然存在争议。我们报告了一种新颖的耦合框架来研究颗粒形态对颗粒动力学的影响。机械行为通过新的微观机械模型进行建模，并且发现颗粒形态极大地阻碍了机械行为。由颗粒形状引起的运动差异因流体的存在而大大减轻。我们的发现通过塌陷过程得到证明，我们发现流体的粘性和润滑作用分别阻碍和增强了位错。结果表明，当颗粒变得更加不规则时，与流体粘性效应相比，流体润滑效应变得占主导地位。
Granular materials are often encountered in nature, but the effect of their morphological properties is poorly understood when they are accompanied by fluid. This set of complexity brings the inertial, viscous, frictional, and elastic forces together whose connections remain debated. We report a novel coupled framework to study the effect of particle morphology on the dynamics of granular particles. The mechanical behavior is modeled by a new micro-mechanical model and is found to be greatly impeded by the morphology of particles. The movement difference caused by the particle shape is greatly alleviated by the presence of fluid. Our findings are demonstrated using a collapse process and we found that the dislocation is both hindered and enhanced by the viscous and lubrication effects of fluid, respectively. The results show that the effect of the fluid lubrication becomes dominant compared to the fluid viscous effect when particles become more irregular.