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首页> 外文期刊>Journal of Tribology >The Inclusion of Friction in Lattice-Based Cellular Automata Modeling of Granular Flows
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The Inclusion of Friction in Lattice-Based Cellular Automata Modeling of Granular Flows

机译：基于格的颗粒流元胞自动机建模中的摩擦包含

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Granular flows continue to be a complex problem in nature and industrial sectors where solid particles exhibit solid, liquid, and gaseous behavior, in a manner which is often unpredictable locally or globally. In tribology, they have also been proposed as lubricants because of their liquid-like behavior in sliding contacts and due to their ability to carry loads and accommodate surface velocities. The present work attempts to model a granular Couette flow using a lattice-based cellular automata computational modeling approach. Cellular automata (CA) is a modeling platform for obtaining fast first-order approximations of the properties of many physical systems. The CA framework has the flexibility to employ rule-based mathematics, first-principle physics, or both to rapidly model physical processes, such as granular flows. The model developed in this work incorporates dissipative effects due to friction between particles and between particles and boundaries, in addition to the derivative effects of friction, namely particle spin. This new model also includes a rigorous and physically relevant treatment of boundary-particle interactions. The current work compares this new friction and spin inclusive CA model and the author's previous frictionless CA model against experimental results for an annular shear cell. The effects of granular collision properties were also examined through parametric studies on particle-particle coefficient of restitution (COR) and coefficient of friction (COF), which is a unique and added capability of the friction inclusive model.
机译：在自然和工业领域中，颗粒流仍然是一个复杂的问题，在这些领域中，固体颗粒表现出的固体，液体和气体行为通常以局部或全局方式无法预测。在摩擦学中，由于它们在滑动接触中具有类似液体的性能，以及由于它们能够承受载荷和适应表面速度的能力，因此也被提议作为润滑剂。本工作尝试使用基于网格的细胞自动机计算建模方法对粒状Couette流进行建模。元胞自动机（CA）是一个建模平台，用于获得许多物理系统的属性的快速一阶近似值。 CA框架具有灵活性，可以采用基于规则的数学，第一原理物理或同时采用两者来快速建模物理过程，例如粒状流。除摩擦的微分效应（即粒子自旋）外，本文中开发的模型还包含了由于粒子之间以及粒子与边界之间的摩擦而产生的耗散效应。这个新模型还包括对边界粒子相互作用的严格和物理相关的处理。当前的工作将这个新的摩擦和自旋包含CA模型与作者先前的无摩擦CA模型与环形剪切单元的实验结果进行了比较。还通过对颗粒-颗粒恢复系数（COR）和摩擦系数（COF）的参数研究，研究了颗粒碰撞性能的影响，这是包含摩擦的模型的独特功能。

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