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On the role of tip curvature on flapping plates

Martin, Nathan Koon-Hung and Gharib, Morteza (2018) On the role of tip curvature on flapping plates. Bioinspiration and Biomimetics, 13 (2). Art. No. 026001. ISSN 1748-3182.

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During the flapping motion of a fish's tail, the caudal fin exhibits antero-posterior bending and dorso-ventral bending, the latter of which is referred to as chord-wise bending herein. The impact of chord-wise tip curvature on the hydrodynamic forces for flapping plates is investigated to explore potential mechanisms to improve the maneuverability or the performance of autonomous underwater vehicles. First, actuated chord-wise tip curvature is explored. Comparison of rigid curved geometries to a rigid flat plate as a baseline suggests that an increased curvature decreases the generated forces. An actuated plate with a dynamic tip curvature is created to illustrate a modulation of this decrease in forces. Second, the impact of curvature is isolated using curved plates with an identical planform area. Comparison of rigid curved geometries as a baseline corroborates the result that an increased curvature decreases the generated forces, with the exception that presenting a concave geometry into the flow increases the thrust and the efficiency. A passively-actuated plate is designed to capitalize on this effect by presenting a concave geometry into the flow throughout the cycle. The dynamically and passively actuated plates show potential to improve the maneuverability and the efficiency of autonomous underwater vehicles, respectively.

Item Type:Article
Related URLs:
URLURL TypeDescription
Martin, Nathan Koon-Hung0000-0001-6038-6177
Gharib, Morteza0000-0002-2204-9302
Additional Information:© 2017 IOP Publishing. Received 1 September 2017. Revised 8 November 2017. Accepted 14 December 2017. Accepted Manuscript online 14 December 2017. Published 9 January 2018. This work was supported by the Charyk Bio-inspired Laboratory at the California Institute of Technology. NM was supported by the National Science Foundation Graduate Research Fellowship under Grant No. DGE-1144469. The plates used for dye visualization were fabricated at the Caltech Library TechLab 3D Printing Facility, which was created and is sustained by funding from both the Caltech Moore-Hufstedler Fund and the Caltech Library.
Funding AgencyGrant Number
Charyk Bio-inspired Laboratory, CaltechUNSPECIFIED
NSF Graduate Research FellowshipDGE-1144469
Caltech Moore-Hufstedler FundUNSPECIFIED
Caltech LibraryUNSPECIFIED
Subject Keywords:digital particle image velocimetry (DPIV), fluid-structure interactions, flapping propulsion, fish swimming, wing tip curvature, bio-inspired propulsion
Issue or Number:2
Record Number:CaltechAUTHORS:20171120-100556869
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Official Citation:Nathan Martin and Morteza Gharib 2018 Bioinspir. Biomim. 13 026001
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:83335
Deposited By: George Porter
Deposited On:18 Dec 2017 18:07
Last Modified:03 Oct 2019 19:05

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