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  • 标题:Accelerating fishes increase propulsive efficiency by modulating vortex ring geometry
  • 本地全文:下载
  • 作者:Otar Akanyeti ; Joy Putney ; Yuzo R. Yanagitsuru
  • 期刊名称:Proceedings of the National Academy of Sciences
  • 印刷版ISSN:0027-8424
  • 电子版ISSN:1091-6490
  • 出版年度:2017
  • 卷号:114
  • 期号:52
  • 页码:13828-13833
  • DOI:10.1073/pnas.1705968115
  • 语种:English
  • 出版社:The National Academy of Sciences of the United States of America
  • 摘要:Swimming animals need to generate propulsive force to overcome drag, regardless of whether they swim steadily or accelerate forward. While locomotion strategies for steady swimming are well characterized, far less is known about acceleration. Animals exhibit many different ways to swim steadily, but we show here that this behavioral diversity collapses into a single swimming pattern during acceleration regardless of the body size, morphology, and ecology of the animal. We draw on the fields of biomechanics, fluid dynamics, and robotics to demonstrate that there is a fundamental difference between steady swimming and forward acceleration. We provide empirical evidence that the tail of accelerating fishes can increase propulsive efficiency by enhancing thrust through the alteration of vortex ring geometry. Our study provides insight into how propulsion can be altered without increasing vortex ring size and represents a fundamental departure from our current understanding of the hydrodynamic mechanisms of acceleration. Our findings reveal a unifying hydrodynamic principle that is likely conserved in all aquatic, undulatory vertebrates.
  • 关键词:acceleration ; undulatory swimming ; vortex ring ; fish ; hydrodynamics
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