Abstract

Both schooling behavior and burst-and-coast gait could improve fish swimming performance. The extent to which fish can improve their swimming performance by combining these two strategies is still unknown. By examining two self-propelled pitching foils positioned side-by-side at different duty cycles (DC), we examine swimming speed and cost of transport efficiency (CoT) using the open-source immersed boundary software IBAMR. We find that a stable schooling formation can only be maintained if both foils employ similar and moderate DC values. In these cases, vortex interactions increase foils’ lateral movements, but not their swimming speed or efficiency. Additionally, we examine vortex interactions in both “schooling" and “fission" scenarios (which are determined by DC). The research provides useful insights into fish behavior and valuable information for designing bio-inspired underwater robots.

Graphic abstract

中文翻译：

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并排排列的两个爆发和滑行游泳者的涡旋相互作用

摘要

鱼群行为和爆发式滑行步态都可以提高鱼类的游泳表现。通过结合这两种策略，鱼类能够在多大程度上提高其游泳表现仍然未知。通过检查两个在不同占空比 ( DC )下并排放置的自驱动俯仰水翼，我们使用开源浸入式边界软件IBAMR检查游泳速度和运输效率成本 ( CoT ) 。我们发现，只有两个箔都采用相似且适度的DC，才能维持稳定的学校教育形态价值观。在这些情况下，涡流相互作用会增加水翼的横向运动，但不会增加其游泳速度或效率。此外，我们还研究了“学校教育”和“裂变”场景中的涡旋相互作用（由DC确定）。该研究为鱼类行为提供了有用的见解，并为设计仿生水下机器人提供了宝贵的信息。

图文摘要