Escape dynamics of confined undulating worms
Escape dynamics of confined undulating worms
复制标题
DOI：
10.1039/d3sm00211j
复制
发表时间：
2023-06-01
期刊：
影响因子：
3.4
通讯作者：
Kudrolli，Arshad
中科院分区：
文献类型：
--
作者：
Biswas，Animesh;Kudrolli，Arshad
我们调查的逃逸动力学的寡毛类Lumbriculus variegatus限制在一个准二维的圆形室与狭窄的出口通道。蠕虫通过执行波动和蠕动行程移动，并使用它们的头部积极探测周围环境。我们发现，蠕虫遵循腔室边界偶尔反转的方向和速度确定的方向角的身体相对于边界。到达通道所需的平均时间随着通道宽度的减小而减小，直到接近一个常数，这与边界跟踪搜索策略一致。我们的搜索动态建模为一个持久的随机行走沿着边界，并证明了头部越来越多地跳过通道入口较小的通道宽度，由于身体的波动。模拟捕捉观察到的指数时间分布到达出口和他们的平均值作为宽度的函数时，从随机位置开始。即使在头部穿透通道入口之后，我们发现蠕虫并不总是逃脱，因为头部在由双冲程幅度设定的距离上有节奏地撤回到腔室中。我们的研究强调了边界跟踪和身体中风的重要性，以确定如何从封闭的空间中逃脱活跃的物质。
We investigate the escape dynamics of oligochaeta Lumbriculus variegatus by confining them to a quasi-2D circular chamber with a narrow exit passage. The worms move by performing undulatory and peristaltic strokes and use their head to actively probe their surroundings. We show that the worms follow the chamber boundary with occasional reversals in direction and with velocities determined by the orientation angle of the body with respect to the boundary. The average time needed to reach the passage decreases with its width before approaching a constant, consistent with a boundary-following search strategy. We model the search dynamics as a persistent random walk along the boundary and demonstrate that the head increasingly skips over the passage entrance for smaller passage widths due to body undulations. The simulations capture the observed exponential time-distributions taken to reach the exit and their mean as a function of width when starting from random locations. Even after the head penetrates the passage entrance, we find that the worm does not always escape because the head withdraws rhythmically back into the chamber over distances set by the dual stroke amplitudes. Our study highlights the importance of boundary following and body strokes in determining how active matter escapes from enclosed spaces.