Undulatory locomotion of flexible foils as biomimetic models for understanding fish propulsion

DSpace/Manakin Repository

Undulatory locomotion of flexible foils as biomimetic models for understanding fish propulsion

Citable link to this page


Title: Undulatory locomotion of flexible foils as biomimetic models for understanding fish propulsion
Author: Shelton, R. M.; Thornycroft, P. J. M.; Lauder, George V.

Note: Order does not necessarily reflect citation order of authors.

Citation: Shelton, R. M., P. J. M. Thornycroft, and G. V. Lauder. 2014. Undulatory Locomotion of Flexible Foils as Biomimetic Models for Understanding Fish Propulsion. Journal of Experimental Biology 217, no. 12: 2110–2120. doi:10.1242/jeb.098046.
Full Text & Related Files:
Abstract: An undulatory pattern of body bending in which waves pass along the body from head to tail is a major mechanism of creating thrust in many fish species during steady locomotion. Analyses of live fish swimming have provided the foundation of our current understanding of undulatory locomotion, but our inability to experimentally manipulate key variables such as body length, flexural stiffness and tailbeat frequency in freely swimming fish has limited our ability to investigate a number of important features of undulatory propulsion. In this paper we use a mechanical flapping apparatus to create an undulatory wave in swimming flexible foils driven with a heave motion at their leading edge, and compare this motion with body bending patterns of bluegill sunfish (Lepomis macrochirus) and clown knifefish (Notopterus chitala). We found similar swimming speeds, Reynolds and Strouhal numbers, and patterns of curvature and shape between these fish and foils, suggesting that flexible foils provide a useful model for understanding fish undulatory locomotion. We swam foils with different lengths, stiffnesses and heave frequencies while measuring forces, torques and hydrodynamics. From measured forces and torques we calculated thrust and power coefficients, work and cost of transport for each foil. We found that increasing frequency and stiffness produced faster swimming speeds and more thrust. Increasing length had minimal impact on swimming speed, but had a large impact on Strouhal number, thrust coefficient and cost of transport. Foils that were both stiff and long had the lowest cost of transport (in mJ m−1 g−1) at low cycle frequencies, and the ability to reach the highest speed at high cycle frequencies.
Published Version: doi:10.1242/jeb.098046
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:30593915
Downloads of this work:

Show full Dublin Core record

This item appears in the following Collection(s)


Search DASH

Advanced Search