Globally aligned states and hydrodynamic traffic jams in confined suspensions of active asymmetric particles.
Globally aligned states and hydrodynamic traffic jams in confined suspensions of active asymmetric particles.
复制标题
活性不对称粒子的受限悬浮液中的全局排列状态和流体动力交通堵塞。
DOI：
10.1103/physreve.89.021002
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
D. Saintillan
中科院分区：
文献类型：
--
作者：
A. Lefauve;D. Saintillan
由于动量筛选和限制壁的润滑摩擦，强限制的活性液体会受到独特的流体动力相互作用。通过数值模拟，我们证明了 Hele-Shaw 几何结构中前后不对称极地游泳者的二维稀悬浮液可以根据颗粒形状表现出丰富多样的新颖相行为，包括具有全局对准的相干偏振密度波、持续反向旋转涡流、密度激波和稀疏波。我们还使用线性稳定性分析和非线性交通流模型来解释这些现象，两者都源自平均场动力学理论。
Strongly confined active liquids are subject to unique hydrodynamic interactions due to momentum screening and lubricated friction by the confining walls. Using numerical simulations, we demonstrate that two-dimensional dilute suspensions of fore-aft asymmetric polar swimmers in a Hele-Shaw geometry can exhibit a rich variety of novel phase behaviors depending on particle shape, including coherent polarized density waves with global alignment, persistent counterrotating vortices, density shocks and rarefaction waves. We also explain these phenomena using a linear stability analysis and a nonlinear traffic flow model, both derived from a mean-field kinetic theory.