Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session E25: Focus Session: Flow Past Passive Hairy Surfaces
5:10 PM–6:28 PM,
Sunday, November 18, 2018
Georgia World Congress Center Room: B313
Chair: Kaitlyn Hood, Massachusetts Institute of Technology
Abstract ID: BAPS.2018.DFD.E25.4
Abstract: E25.00004 : Elastic feathers spreading fluid-impact force*
5:49 PM–6:02 PM
(National Museum of Natural History, Smithsonian Institution, Washington DC)
Northern Gannets are seabirds that frequently employ a hunting tactic called ‘plunge-diving’ in which they dive through the water surface at high-speeds to catch underwater prey; often reaching speeds of up to 24 m/s at the moment of impact. It can result in forces as high as 500 N acting on the bird’s neck during impact, yet the bird escapes uninjured, despite making 20-100 dives per foraging trips. However, little is known about how such high impact forces affect the rest of the body. The goal of this study is to investigate the role played by the feathers in spreading the hydrodynamic forces on the skin around the impact zone. We model the feathers as elastic beams taking into account their pre-curvature and non-uniform cross-section. Results from our experiments with polycarbonate beams suggest that the interaction of feathers on the skin patch redistributes the force, thereby reducing the impact on any particular area of the skin.
*This research was supported by National Science Foundation Grant CBET-1604424.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.E25.4
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