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.M20.9
Abstract: M20.00009 : Aim affects fin interactions and wake topology in jumping archer fish*
9:44 AM–9:57 AM
(Harvey Mudd College)
(Harvey Mudd College)
Alexandra H. Techet
(Massachusetts Inst of Tech-MIT)
Archer fish jumping for aerial prey rapidly accelerate from a stationary aiming position below the free surface. Herein we investigate how this aiming behavior affects propulsion during an archer fish jump. Using high-speed imaging, we find that the angle between the body and the free surface at jump onset varies with target prey height. Through volumetric synthetic aperture particle image velocimetry, we find that this posture considerably influences the upward contributions of the fish's initial propulsive tailbeats. Furthermore, we show that the orientation of the body causes different modes of interaction between the anal and caudal fins. These interactions are also found to differ between when the body has minimal upward velocity (i.e., jump onset) and when the body has a greater instantaneous velocity at later times during the jump. We find strong agreement between the cumulative effects of multiple propulsive motions, measured through wake impulse, and the instantaneous ballistic velocity of the fish. Our results highlight how discrete tailbeats and multi-fin propulsive strategies enable accurate jumping from a spatially- and visually-constrained environment.
*This material is based upon work partially supported by the National Science Foundation (CBET-1703978).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.M20.9
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