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首页> 外文期刊>Journal of Computational Physics >Collision of multi-particle and general shape objects in a viscous fluid
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Collision of multi-particle and general shape objects in a viscous fluid

机译：粘性流体中多粒子和一般形状物体的碰撞

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摘要

The dynamics of particle-particle collisions in a viscous fluid are numerically investigated. A distributed-Lagrange-multiplier-based computational method in a solid-fluid system is developed and a collision strategy for general shape objects is presented. In earlier methods, a repulsive force is applied to the particles when their separation is less than a critical value and, depending on the magnitude of this repulsive force, collision may not be prevented or particles may bounce unrealistically. In the present method, upon collision of two or more particles, a uniformly distributed force is added to each particle. The contact force is calculated and the relative velocity of the particles along their line of center vanishes. For non-spherical (or non-cylindrical in 2-D) particles the force due to collision may lead to a torque around the center of mass of each particle. In this situation, the uniform distributed force is modified in order to create a net torque around the center of mass of each particle without changing the net force applied to that particle. The contact force is impulsive at the onset of the collision process and decreases smoothly to zero when contact ends. Particles separate from each other when the contact force vanishes and subsequently, a rigidity constraint is satisfied for each particle separately. Results for systems of multi-particle and general shape objects in a viscous fluid are presented. (C) 2008 Elsevier Inc. All rights reserved.
机译：数值研究了粘性流体中的颗粒颗粒碰撞的动态。开发了一种在固体流体系统中的分布式拉格朗加尔乘数的计算方法，并提出了一般形状物体的碰撞策略。在早期的方法中，当它们的分离小于临界值时，将排斥力施加到颗粒上，并且取决于这种排斥力的大小，可能不会被防止碰撞，或者碰撞或颗粒可以不切实地反弹。在本方法中，在两种或更多种颗粒的碰撞时，向每个颗粒中加入均匀分布的力。计算接触力，并且沿其中心线的颗粒的相对速度消失。对于非球形（或非圆柱形IN 2-D）颗粒，由于碰撞引起的力可能导致每个颗粒的质心围绕的扭矩。在这种情况下，修改均匀分布力以在每个颗粒的质心围绕的净扭矩进行修改，而不改变施加到该颗粒的净力。在碰撞过程的开始时接触力是脉冲的，并且当接触结束时，在凝固过程中平稳地降低至零。当接触力消失并且随后，颗粒彼此分开，分别对每个颗粒满足刚性约束。提出了粘性流体中多粒子和一般形状物体的系统的结果。 （c）2008年elestvier Inc.保留所有权利。

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