We model the hydrodynamic interaction of two equal size capsules in simple shear flow. The capsules may have different mechanical membrane properties. The results are analyzed in terms of a macro scale model of capsule membrane damage. We show how the interaction between two capsules with a membrane rigidity mismatch may lead to damage of the more deformable capsule even when the base flow strength is below the damage threshold of both capsules. We provide charts of the peak deformation energy density in the two membranes as a function of the flow strength and the ratio of the elastic rigidity of the two capsules. Given a damage criterion, those charts can be used to determine when flow-induced damage will occur in a suspension of capsules with a distribution of mechanical properties.

我们模拟了简单剪切流中两个相同尺寸胶囊的流体动力相互作用。胶囊可以具有不同的机械膜特性。根据胶囊膜损伤的宏观模型对结果进行分析。我们展示了膜刚度不匹配的两个胶囊之间的相互作用如何导致变形较大的胶囊损坏，即使基流强度低于两个胶囊的损坏阈值。我们提供了两种膜中的峰值变形能量密度作为流动强度和两个胶囊的弹性刚度之比的函数的图表。给定损坏标准，这些图表可用于确定具有机械特性分布的胶囊悬浮液中何时会发生流动引起的损坏。