RT journal article
T1 Three-dimensional viscous wake flow in fish swimming - A CFD study
A1 Machuca Macías, Marianela
A1 Souza, Igor F
A1 Felamingo Oliveira, Taygoara
A1 Brasil Junior, Antonio C.P
A2 Ingeniería Mecánica y Diseño Industrial
K1 Fish swimming
K1 Vortex dynamics
K1 Leading-edge swimming vortices
K1 ALE-CFD
K1 Fish wake structure
AB In the present paper, the assessment of the hydrodynamics of fish swimming wake-flow is carried out to identify the main features related to the propulsion performance. Two different fish models with caragiform kinematics are studied: tuna fish (Thunnus atlanticus) and lambari (Astyanax bimaculatus). CFD methods were used to simulate laminar and turbulent flow regimes and a dynamically adaptive mesh discretization (ALE) was employed to reproduce fish motion. Simulations were run in a typical range of Reynolds (Re) and Strouhal (St) numbers of the fish swimming flow investigating hydrodynamics forces and the flow patterns of the induced fish-swimming wake. Firstly, equilibrium condition (drag balancing thrust) for Strouhal was achieved for each Reynolds number and three-dimensional wake structures were evaluated concluding that fish swimming experiencing a forward locomotion movement with a reversal von-Kármán vortex street and a high-velocity jet through the downstream direction. Finally, vorticity dynamics analysis showing that the leading-edge vortex produced by the caudal fin is associated to the peak of thrust in the motion cycle.
PB Elsevier
SN 0093-6413
YR 2020
FD 2020
LK http://hdl.handle.net/10498/38324
UL http://hdl.handle.net/10498/38324
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 07-nov-2026