Carlevaro C Manuel, Kozlowski Ryan, Pugnaloni Luis A, Zheng Hu, Socolar Joshua E S, Kondic Lou
Instituto de Física de Líquidos y Sistemas Biológicos, CONICET, 59 789, 1900 La Plata, Argentina and Departamento de Ingeniería Mecánica, Universidad Tecnológica Nacional, Facultad Regional La Plata, La Plata, 1900, Argentina.
Department of Physics, Duke University, Durham, North Carolina 27708, USA.
Phys Rev E. 2020 Jan;101(1-1):012909. doi: 10.1103/PhysRevE.101.012909.
We present simulation results for an intruder pulled through a two-dimensional granular system by a spring using a model designed to mimic the experiments described by Kozlowski et al. [Phys. Rev. E 100, 032905 (2019)2470-004510.1103/PhysRevE.100.032905]. In that previous study the presence of basal friction between the grains and the base was observed to change the intruder dynamics from clogging to stick-slip. Here we first show that our simulation results are in excellent agreement with the experimental data for a variety of experimentally accessible friction coefficients governing interactions of particles with each other and with boundaries. We then use simulations to explore a broader range of parameter space, focusing on the friction between the particles and the base. We consider both static and dynamic basal friction coefficients, which are difficult to vary smoothly in experiments. The simulations show that dynamic friction strongly affects the stick-slip behavior when the coefficient is decreased below 0.1, while static friction plays only a marginal role.
我们展示了使用一个旨在模拟Kozlowski等人[《物理评论E》100, 032905 (2019)2470 - 004510.1103/PhysRevE.100.032905]所描述实验的模型，通过弹簧将一个入侵者拉过二维颗粒系统的模拟结果。在之前的研究中，观察到颗粒与基底之间存在的基底摩擦力会使入侵者的动力学从堵塞转变为粘滑。在这里，我们首先表明，对于各种实验可获取的、控制粒子相互之间以及与边界相互作用的摩擦系数，我们的模拟结果与实验数据高度吻合。然后我们使用模拟来探索更广泛的参数空间，重点关注颗粒与基底之间的摩擦力。我们考虑了静态和动态基底摩擦系数，这在实验中很难平滑地改变。模拟结果表明，当动态摩擦系数降低到0.1以下时，动态摩擦会强烈影响粘滑行为，而静态摩擦只起很小的作用。
