Worlitzer Vasco M, Ariel Gil, Be'er Avraham, Stark Holger, Bär Markus, Heidenreich Sebastian
Department of Mathematical Modelling and Data Analysis, Physikalisch-Technische, Bundesanstalt Braunschweig und Berlin, Abbestrasse 2-12, D-10587 Berlin, Germany.
Department of Mathematics, Bar-Ilan University, 52900 Ramat Gan, Israel.
Soft Matter. 2021 Dec 1;17(46):10447-10457. doi: 10.1039/d1sm01276b.
We study a novel phase of active polar fluids, which is characterized by the continuous creation and destruction of dense clusters due to self-sustained turbulence. This state arises due to the interplay between self-advection of the aligned swimmers and their defect topology. The typical cluster size is determined by the characteristic vortex size. Our results are obtained by investigating a continuum model of compressible polar active fluids, which incorporates typical experimental observations in bacterial suspensions, in particular a non-monotone dependence of speed on density.
我们研究了活性极性流体的一种新相，其特征是由于自持湍流导致密集团簇的持续产生和破坏。这种状态是由于排列的游动体的自平流与其缺陷拓扑结构之间的相互作用而产生的。典型的团簇大小由特征涡旋大小决定。我们的结果是通过研究可压缩极性活性流体的连续介质模型得到的，该模型纳入了细菌悬浮液中的典型实验观察结果，特别是速度对密度的非单调依赖性。
