Stable formations of self-propelled fish-like swimmers induced by hydrodynamic interactions
Stable formations of self-propelled fish-like swimmers induced by hydrodynamic interactions
复制标题
水动力相互作用诱导的自驱动鱼状游泳者的稳定形态
DOI：
10.1098/rsif.2018.0490
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发表时间：
2018-10-01
影响因子：
3.9
通讯作者：
Zhang, Xing
中科院分区：
文献类型：
--
作者：
Dai, Longzhen;He, Guowei;Zhang, Xing
鱼群是具有集体行为的宏观系统的迷人例子。根据传统智慧，鱼群的建立和维持可能需要非常复杂的主动控制机制。詹姆斯·莱特希尔爵士认为，鱼群中有序的结构可能是被动水动力相互作用的结果。在这里，数值模拟进行测试莱特希尔的猜想，通过研究两个，三个和四个鱼一样的游泳者的自推进运动。我们报告了各种配置的紧急稳定编队，并检查每个编队的能量效率。这项工作的结果表明，被动水动力相互作用的存在可以显着减轻控制的挑战，在学校。此外，我们关于能源效率的发现也挑战了流体力学界的普遍观点，即菱形阵列是最优化的模式。
Fish schools are fascinating examples of macro-scale systems with collective behaviours. According to conventional wisdom, the establishment and maintenance of fish schools probably need very elaborate active control mechanisms. Sir James Lighthill posited that the orderly formations in fish schools may be an emergent feature of the system as a result of passive hydrodynamic interactions. Here, numerical simulations are performed to test Lighthill’s conjecture by studying the self-propelled locomotion of two, three and four fish-like swimmers. We report the emergent stable formations for a variety of configurations and examine the energy efficiency of each formation. The result of this work suggests that the presence of passive hydrodynamic interactions can significantly mitigate the control challenges in schooling. Moreover, our finding regarding energy efficiency also challenges the widespread idea in the fluid mechanics community that the diamond-shaped array is the most optimized pattern.