Amarsid L, Delenne J-Y, Mutabaruka P, Monerie Y, Perales F, Radjai F
IRSN, PSN, CE Cadarache, BP3-13115 St Paul-Lez-Durance Cedex, France.
LMGC, CNRS, University of Montpellier, 163 rue Auguste Broussonnet, 34090 Montpellier, France.
Phys Rev E. 2017 Jul;96(1-1):012901. doi: 10.1103/PhysRevE.96.012901. Epub 2017 Jul 5.
By means of extensive coupled molecular dynamics-lattice Boltzmann simulations, accounting for grain dynamics and subparticle resolution of the fluid phase, we analyze steady inertial granular flows sheared by a viscous fluid. We show that, for a broad range of system parameters (shear rate, confining stress, fluid viscosity, and relative fluid-grain density), the frictional strength and packing fraction can be described by a modified inertial number incorporating the fluid effect. In a dual viscous description, the effective viscosity diverges as the inverse square of the difference between the packing fraction and its jamming value, as observed in experiments. We also find that the fabric and force anisotropies extracted from the contact network are well described by the modified inertial number, thus providing clear evidence for the role of these key structural parameters in dense suspensions.
通过广泛的耦合分子动力学-格子玻尔兹曼模拟，考虑颗粒动力学和流体相的亚颗粒分辨率，我们分析了由粘性流体剪切的稳定惯性颗粒流。我们表明，对于广泛的系统参数（剪切速率、围压、流体粘度和流体与颗粒的相对密度），摩擦强度和堆积分数可以用一个包含流体效应的修正惯性数来描述。在双粘性描述中，有效粘度如实验中所观察到的那样，随着堆积分数与其堵塞值之差的平方反比而发散。我们还发现，从接触网络中提取的结构和力各向异性可以用修正惯性数很好地描述，从而为这些关键结构参数在稠密悬浮液中的作用提供了明确证据。
