Water exit dynamics of jumping archer fish: Integrating two-phase flow large-eddy simulation with experimental measurements
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011904_1_1.5130886.pdf
Description
Published version
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12.33 MB
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Checksum (MD5)
87538951c1a36db667d93a6a3a4c19b8
Author(s)
Khosronejad, Ali
Mendelson, Leah
Techet, Alexandra H
Kang, Seokkoo
Angelidis, Dionysios
Sotiropoulos, Fotis
Date Issued
January 9, 2020
Journal
Physics of Fluids
Publisher
AIP Publishing
Citation
Ali Khosronejad, Leah Mendelson, Alexandra H. Techet, Seokkoo Kang, Dionysios Angelidis, Fotis Sotiropoulos; Water exit dynamics of jumping archer fish: Integrating two-phase flow large-eddy simulation with experimental measurements. Physics of Fluids 1 January 2020; 32 (1): 011904.
Version
Final published version
Abstract
Archer fish jumping for prey capture are capable of achieving accelerations that can reach 12 times gravitational from a stationary start at the free surface. This behavior is associated with nontrivial production of hydrodynamic thrust. In this work, we numerically investigate the hydrodynamic and aerodynamic performance of a jumping smallscale archer fish (Toxotes microlepis) to elucidate the propulsive mechanisms that contribute to the rapid acceleration and the considerable jump accuracy. We conduct high-fidelity, two-phase flow, large-eddy simulation (LES) of an anatomically realistic archer fish using detailed jump kinematics in water, through the water/air interface, and in air. The complex fish body kinematics are reconstructed using high-speed imaging. The LES results during the water phase of the jump are compared with particle image velocimetry measurements of a live jumping archer fish, and excellent agreement is found. The numerical simulations further enable detailed analysis of the flow dynamics and elucidate for the first time the dynamics of the coherent vortical structures in both the water and air phases. In particular, the pectoral fins are shown to contribute to the initial spike in acceleration before water exit and to enhance the overall jumping performance of the fish.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1063/1.5130886
