Hydrodynamic advantages of a low aspect-ratio flapping foil
- Authors
- Lee, Jeongsu; Park, Yong-Jai; Cho, Kyu-Jin; Kim, Daegyoum; Kim, Ho-Young
- Issue Date
- May-2017
- Publisher
- ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
- Keywords
- Aquatic locomotion; Caudal fin; Vortical structure; Flapping; Propulsion
- Citation
- JOURNAL OF FLUIDS AND STRUCTURES, v.71, pp.70 - 77
- Journal Title
- JOURNAL OF FLUIDS AND STRUCTURES
- Volume
- 71
- Start Page
- 70
- End Page
- 77
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/83900
- DOI
- 10.1016/j.jfluidstructs.2017.03.006
- ISSN
- 0889-9746
- Abstract
- A high aspect-ratio foil is known to be advantageous in terms of both thrust and efficiency in flapping propulsion. However, many species of fish have evolved a low aspect-ratio hydrofoil, which naturally leads one to search for its physical advantages in locomotion. Here we study the flow physics of a hydrofoil in angular reciprocating motion with negligible free-stream velocity to reveal the effects of an aspect ratio on hydrodynamic performance. By establishing a scaling law for the thrust of a foil of general shapes and corroborating it experimentally, we find that the thrust of an angularly reciprocating foil is maximized at a low aspect ratio of 0.7 while hydromechanical efficiency continuously increases with an aspect ratio. This result suggests that a low aspect-ratio foil can improve thrust produced by the foil when they start from rest, but at the expense of efficiency. (C) 2017 Elsevier Ltd. All rights reserved.
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