Effect of leading and secondary vortices on the propulsion performance of an undulating swimmer in the periodic vortex street

IF 4.3 2区 工程技术 Q1 ENGINEERING, OCEAN
Ruoxin Li , Pengfei Wang , Laibing Jia , Yang Han , Kai Yu
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引用次数: 0

Abstract

Aquatic animals have evolved diverse swimming techniques. They have demonstrated abilities to harness energy from vortices, particularly the Kármán vortex street, resulting in enhanced thrust. However, gaps remain in comprehensively understanding the factors influencing this increased thrust and the specific hydrodynamic characteristics involved. In this study, we studied an undulating foil downstream a circular cylinder to further understand the flow control mechanism involved in optimizing energy capture from hydrodynamic disturbances. We utilised numerical simulations with a moving adaptive mesh in laminar flow. We found that the leading vortex and secondary vortex at the foil's leading edge, originating from the Kármán vortex, played a crucial role in thrust enhancement. The undulating foil was more efficient in capturing energy from the Kármán vortex street than a stationary foil. When the foil was nearer to the cylinder, the energy capture was more evident, leading to intricate vortex patterns and easier leading vortex and secondary vortex generation. The foil's lift initially rose with closer proximity but decreased with increased distance. Our results showed that for minimal drag and optimal lift, the cylindrical body's position is closely tied to the interaction between the Kármán vortex street and the undulating foil. These insights can be applied in applications of designing efficient propulsion systems for underwater vehicles and optimising energy harnessing mechanisms in marine environments.

前涡和副涡对周期性涡街中起伏游泳者推进性能的影响
水生动物进化出了多种多样的游泳技术。它们展示了利用涡流能量的能力,尤其是利用卡尔曼涡街,从而增强推力。然而,在全面了解这种推力增强的影响因素和相关的具体流体力学特性方面仍存在差距。在本研究中,我们对圆筒下游的起伏箔片进行了研究,以进一步了解优化流体动力扰动能量捕获所涉及的流动控制机制。我们利用层流中的移动自适应网格进行了数值模拟。我们发现,源于卡尔曼涡旋的箔片前缘的前缘涡旋和次级涡旋在推力增强中起着至关重要的作用。与静止的箔片相比,起伏的箔片能更有效地捕捉来自卡曼涡街的能量。当箔片靠近气缸时,能量捕获更加明显,从而形成复杂的涡流模式,更容易产生前导涡流和次级涡流。箔片的升力最初随着距离的接近而上升,但随着距离的增加而下降。我们的研究结果表明,为了获得最小的阻力和最佳的升力,圆柱体的位置与卡曼涡街和起伏箔片之间的相互作用密切相关。这些见解可应用于设计水下航行器的高效推进系统和优化海洋环境中的能量利用机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Applied Ocean Research
Applied Ocean Research 地学-工程:大洋
CiteScore
8.70
自引率
7.00%
发文量
316
审稿时长
59 days
期刊介绍: The aim of Applied Ocean Research is to encourage the submission of papers that advance the state of knowledge in a range of topics relevant to ocean engineering.
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