Abstract

The computational fluid dynamics-discrete element coupling method is used to simulate the suspension behavior of solid particles in a stirred tank, and the motion trajectories and collision motions of millions of particles are analyzed. These particles have complex interactions with the liquid and the rotating impeller. In this article, we introduce a slip grid method, which is an important method to realize the CFD-DEM coupling. We discuss the influence of liquid flow on the trajectory of solid particles, and analyze the relationship between the eight physical properties of solid particles. It can be concluded that the CFD-DEM coupled approach provides a theoretical way to understand the physics of particle movement in micro- to macro-scales in the solid suspension of a stirred tank.

摘要

采用计算流体动力学-离散元耦合方法模拟固体颗粒在搅拌罐中的悬浮行为，分析了数百万颗粒的运动轨迹和碰撞运动。这些颗粒与液体和旋转的叶轮具有复杂的相互作用。在本文中，我们介绍一种滑动网格方法，它是实现 CFD-DEM 耦合的重要方法。我们讨论了液体流动对固体颗粒运动轨迹的影响，并分析了固体颗粒八种物理性质之间的关系。可以得出结论，CFD-DEM 耦合方法提供了一种理论方法来理解搅拌罐固体悬浮液中从微观到宏观尺度的粒子运动物理特性。