The shear-induced migration of concentrated non-Brownian monodisperse suspensions in combined plane Couette-Poiseuille (C-P) flows is studied using a lattice Boltzmann simulation. The simulations are mainly performed for a particle volume fraction of ϕbulk = 0.4 and H/a = 44.3, 23.3, where H and a denote the channel height and radius of suspended particles, respectively. The simulation method is validated in two simple flows, plane Poiseuille and plane Couette flows. In the Poiseuille flow, particles migrate to the mid-plane of the channel where the local concentration is close to the limit of random-close-packing, and a random structure is also observed at the plane. In the Couette flow, the particle distribution remains in the initial uniform distribution. In the combined C-P flows, the behaviors of migration are categorized into three groups, namely, Poiseuille-dominant, Couette-dominant, and intermediate regimes, based on the value of a characteristic force, G, where G denotes the relative magnitude o...

中文翻译：

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平面 Couette-Poiseuille 流中剪切诱导粒子迁移的格子 Boltzmann 模拟：悬浮的局部排序

使用格子 Boltzmann 模拟研究了在组合平面 Couette-Poiseuille (CP) 流中浓缩的非布朗单分散悬浮液的剪切诱导迁移。模拟主要针对 ϕbulk = 0.4 和 H/a = 44.3, 23.3 的粒子体积分数进行，其中 H 和 a 分别表示悬浮粒子的通道高度和半径。该模拟方法在两个简单的流中得到验证，即 Poiseuille 平面和 Couette 平面流。在泊肃叶流中，粒子迁移到通道的中间平面，该处局部浓度接近随机密堆积的极限，并且在该平面处也观察到随机结构。在 Couette 流中，粒子分布保持初始均匀分布。在组合的 CP 流中，迁移行为分为三组，