论文标题
运动对微孔通道中细菌积累的影响
The Influence of Motility on Bacterial Accumulation in a Microporous Channel
论文作者
论文摘要
我们研究了通过分子动力学模拟与晶状体玻尔兹曼流体结合的分子动力学模拟，该介质通过一个正方形通道建模的多孔介质传输。我们的细菌模型是一种棒状刚体，它是由无力机制推动的。为了说明生物细菌的行为，该模型还结合了跑步的过程。模型细菌能够与通道壁和障碍物的流体动力学相互作用。这使细菌在体验剪切流时可以重新定位。我们证明了该模型能够重现障碍物后侧的细菌积累，就像[G. L. Mino等，使用大肠杆菌细菌的微生物学8，451（2018）的进展。通过系统地改变外部流动强度和细菌的运动性，我们解决了局部流动强度与导致积累的游泳特征之间的相互作用。此外，通过改变通道的几何形状，我们还揭示了细菌与狭窄壁之间相互作用的重要作用。
We study the transport of bacteria in a porous media modeled by a square channel containing one cylindrical obstacle via molecular dynamics simulations coupled to a lattice Boltzmann fluid. Our bacteria model is a rod-shaped rigid body which is propelled by a force-free mechanism. To account for the behavior of living bacteria, the model also incorporates a run-and-tumble process. The model bacteria are capable of hydrodynamically interacting with both of the channel walls and the obstacle. This enables the bacteria to get reoriented when experiencing a shear-flow. We demonstrate that this model is capable of reproducing the bacterial accumulation on the rear side of an obstacle, as has recently been experimentally observed by [G. L. Mino, et al., Advances in Microbiology 8, 451 (2018)] using E.coli bacteria. By systematically varying the external flow strength and the motility of the bacteria, we resolve the interplay between the local flow strength and the swimming characteristics that lead to the accumulation. Moreover, by changing the geometry of the channel, we also reveal the important role of the interactions between the bacteria and the confining walls for the accumulation process.
