Macaulay Matthew, Rognon Pierre
School of Civil Engineering, The University of Sydney, Sydney, NSW 2006, Australia.
Phys Rev Lett. 2021 Mar 19;126(11):118002. doi: 10.1103/PhysRevLett.126.118002.
Dense granular flows are well described by several continuum models; however, their internal dynamics remain elusive. This study explores the contact force distributions in simulated steady and homogenous shear flows. The results demonstrate the existence of high magnitude contact forces in faster flows with stiffer grains. A proposed physical mechanism explains this rate-dependent force transmission. This analysis establishes a relation between contact forces and grain velocities, providing an entry point to unify a range of continuum models derived from either contact forces or grain velocity.
几种连续介质模型很好地描述了密集颗粒流；然而，它们的内部动力学仍然难以捉摸。本研究探索了模拟的稳定均匀剪切流中的接触力分布。结果表明，在颗粒较硬的较快流动中存在高量级的接触力。一种提出的物理机制解释了这种与速率相关的力传递。该分析建立了接触力与颗粒速度之间的关系，为统一一系列从接触力或颗粒速度推导出来的连续介质模型提供了一个切入点。
