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 M20: Biological Fluid Dynamics: Locomotion Swimming - Fishes I
8:00 AM–10:10 AM,
Tuesday, November 20, 2018
Georgia World Congress Center Room: B308
Chair: Alexandra Techet, Massachusetts Institute of Technology
Abstract ID: BAPS.2018.DFD.M20.2
Abstract: M20.00002 : How aquatic animals leap out of water*
8:13 AM–8:26 AM
(Seoul National Univ)
(Seoul Natl Univ)
Many aquatic animals leap out of water to hunt, escape predators, or even recreationally. In this study, we investigate the physical conditions required for animals to leap out of water. By balancing power produced by the animal with drag-induced dissipation, we show that the normalized jumping height, H/L, scales with the Froude number as H/L∼Fr2. Simplified experiments were conducted by shooting axisymmetric bodies through the water surface. Here, we see a transition in which partial exits scale as H/L∼Fr and complete exits scale as H/L∼Fr2. Finally, a bio-inspired robot was built to jump out of water. We show that a large volume of water is entrained during the jump, which limits the maximum jumping height. Larger ratios of body mass to entrained fluid mass shows that the body will jump higher to a similar range as animals.
*National Science Foundation EAPSI #1613138 (B.C.) and National Research Foundation of Korea Grant No. 2018R1A3B1052541 via SNU IAMD (H.Y.K.).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.M20.2
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