Stokes动力学中长程迁移率相互作用的反常效应
Anomalous effect of turning off long-range mobility interactions in Stokesian Dynamics
摘要：
在斯托克斯动力学中，假设粒子以两种方式相互作用：通过长程流动相互作用和通过短程润滑相互作用。为了加快计算速度，在剪切驱动的浓悬浮液中，通常在流变环境中发现，通常只考虑润滑。我们表明，虽然这种近似可以提供可接受的结果，在剪切驱动的，周期性的悬浮液，对于双分散悬浮液中的颗粒暴露于一个外力，它可以产生物理上不合理的结果。我们建议，这个问题可以减轻一个仔细选择的颗粒对润滑相互作用应包括在内。
英文摘要：
In Stokesian Dynamics, particles are assumed to interact in two ways: through long-range mobility interactions and through short-range lubrication interactions. To speed up computations, in shear-driven concentrated suspensions, often found in rheometric contexts, it is common to consider only lubrication. We show that, although this approximation may provide acceptable results in shear-driven, periodic suspensions, for bidisperse suspensions where the particles are exposed to an external force, it can produce physically unreasonable results. We suggest that this problem could be mitigated by a careful choice of particle pairs on which lubrication interactions should be included.
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