论文标题
可压缩和不可压缩流中的主动列缺陷
Active nematic defects in compressible and incompressible flows
论文作者
论文摘要
我们研究了由有或没有不可压缩约束的主动流动驱动的底物上的活性列膜的动力学。通过模拟和理论分析，我们表明，在不可压缩性约束下它们变得不稳定。对于在足够高的活动中可压缩的流动，稳定的拱门将自己组织成类似于近晶状体的模式，从而诱导$+1/2 $ nematic缺陷的相关全球极性排序。相比之下，无差流的流量产生了$+1/2 $缺陷的局部列表，由先前的研究中确定，由反将的邻近缺陷对组成。
We study the dynamics of active nematic films on a substrate driven by active flows with or without the incompressible constraint.Through simulations and theoretical analysis, we show that arch patterns are stable in the compressible case, whilst they become unstable under the incompressibility constraint. For compressible flows at high enough activity, stable arches organize themselves into a smectic-like pattern, which induce an associated global polar ordering of $+1/2$ nematic defects. By contrast, divergence-free flows give rise to a local nematic order of the $+1/2$ defects, consisting of anti-aligned pairs of neighboring defects, as established in previous studies.
