AI 中文总结
研究活性粒子在无热力学锚定时于刚性边界的排列问题，采用连续介质模拟和分析论证，揭示了不同状态下活性向列相的排列规律，为活性诱导锚定提供统一框架，表明边界排列可源于自生成流与取向动力学相互作用。
AI 中文摘要
尽管约束对活性材料中的流动有很大影响，但当没有热力学锚定时，活性粒子在刚性边界处如何排列仍不清楚。我们使用活性向列相的连续介质模拟以及基于简化近壁描述的分析论证来解决这个问题。在流动翻滚状态下，拉伸系统与边界平行排列，而收缩系统与边界垂直排列，这与在主动-被动界面观察到的活性锚定一致。在流动排列状态下，首选取向取决于活性和流动排列参数的符号：要么壁附近产生 的剪切流选择莱斯利角，要么没有建立唯一的排列。这些结果为刚性壁上的活性诱导锚定提供了一个统一框架，表明致密活性物质中的边界排列可以仅来自自生成流和取向动力学之间的相互作用。
英文摘要
Although confinement strongly influences flows in active materials, it remains unclear how active particles align at rigid boundaries when no thermodynamic anchoring is imposed. We address this question using continuum simulations of active nematics, together with analytical arguments based on a reduced near-wall description. In the flow-tumbling regime, extensile systems align parallel to the boundary, whereas contractile systems align perpendicular to it, consistent with active anchoring observed at active-passive interfaces. In the flow-aligning regime, the preferred orientation depends on the sign of activity and of the flow aligning parameter: either the shear-like flow generated near the wall selects the Leslie angle, or no unique alignment is established. These results provide a unified framework for activity-induced anchoring at rigid walls, demonstrating that boundary alignment in dense active matter can emerge solely from the interplay between self-generated flows and orientational dynamics.
