Naut你的日常水母模型：探索触角和口臂如何影响运动
Naut your everyday jellyfish model: Exploring how tentacles and oral arms impact locomotion
摘要：
水母-雄伟，节能，是栖息在海洋中的最古老的物种之一。也许是第二个项目，它们的效率，吸引了科学家几十年来研究它们的运动行为。然而，没有人专门探讨过它们的触角和口臂可能对它们潜在的游泳能力的作用，可以说，这些特征赋予了水母美丽的同时也给它们的猎物（和海滩游客）带来了恐惧。我们进行比较在硅片实验，研究如何肌腱/口臂数，长度，位置和密度影响向前游泳速度，运输成本，和流体混合。一个开源的实现浸没边界法（IB 2d）来解决完全耦合的流体-结构相互作用的问题的理想化的柔性水母钟与多孔弹性触角/口臂在粘性，不可压缩流体。总的触须/口臂抑制向前游泳的速度，似乎抑制漩涡的形成。观察到长度和流体尺度（雷诺数）以及触须/口臂数量，密度和位置之间的非线性关系，说明形态上的微小变化可能导致游泳速度显着降低，在某些情况下，在没有触须/口臂的情况下，下降400%。
英文摘要：
Jellyfish - majestic, energy efficient, and one of the oldest species that inhabits the oceans. It is perhaps the second item, their efficiency, that has captivated scientists for decades into investigating their locomotive behavior. Yet, no one has specifically explored the role that their tentacles and oral arms may have on their potential swimming performance, arguably the very features that give jellyfish their beauty while instilling fear into their prey (and beach-goers). We perform comparative in silico experiments to study how tentacle/oral arm number, length, placement, and density affect forward swimming speeds, cost of transport, and fluid mixing. An open source implementation of the immersed boundary method was used (IB2d) to solve the fully coupled fluid-structure interaction problem of an idealized flexible jellyfish bell with poroelastic tentacles/oral arms in a viscous, incompressible fluid. Overall tentacles/oral arms inhibit forward swimming speeds, by appearing to suppress vortex formation. Non-linear relationships between length and fluid scale (Reynolds Number) as well as tentacle/oral arm number, density, and placement are observed, illustrating that small changes in morphology could result in significant decreases in swimming speeds, in some cases by downwards of 400% between cases with to without tentacles/oral arms.
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