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Water exit dynamics of jumping archer fish: Integrating two-phase flow large-eddy simulation with experimental measurements

Title
Water exit dynamics of jumping archer fish: Integrating two-phase flow large-eddy simulation with experimental measurements
Author
강석구
Keywords
IMMERSED BOUNDARY METHOD; PIKE ESOX-LUCIUS; C-START; S-START; HYDRODYNAMICS; KINEMATICS; COMPLEX; 3D; AERIAL
Issue Date
2020-01
Publisher
AMER INST PHYSICS
Citation
PHYSICS OF FLUIDS, v. 32, no. 1, article no. 11904
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 smalscale 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. Published under license by AIP Publishing.
URI
https://aip.scitation.org/doi/10.1063/1.5130886https://repository.hanyang.ac.kr/handle/20.500.11754/160991
ISSN
1070-6631; 1089-7666
DOI
10.1063/1.5130886
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CIVIL AND ENVIRONMENTAL ENGINEERING(건설환경공학과) > Articles
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