运动细菌密集菌落的前沿结构和动力学：活性turbulence的作用
Front structure and dynamics in dense colonies of motile bacteria: Role of active turbulence
摘要：
我们研究了一个细菌菌落的传播经历湍流一样的集体运动。我们提出了两个最低限度的模型来研究人口增长和湍流产生的相干结构之间的相互作用。利用直接数值模拟（DNS）的建议的模型，我们发现，湍流有两个突出的影响殖民地的空间增长：（a）前的速度提高，（b）前变得皱巴巴的。这两种效应，我们强调使用统计工具，在我们的两个模型中是显着不同的。我们还表明，在某些制度下，在随机流的褶皱前结构和被动标量锋。
英文摘要：
We study the spreading of a bacterial colony undergoing turbulent like collective motion. We present two minimalistic models to investigate the interplay between population growth and coherent structures arising from turbulence. Using Direct Numerical Simulation (DNS) of the proposed models we find that turbulence has two prominent effects on the spatial growth of the colony: (a) the front speed is enhanced, and (b) the front gets crumpled. Both these effects, which we highlight by using statistical tools, are markedly different in our two models. We also show that the crumpled front structure and the passive scalar fronts in random flows are related in certain regimes.
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