Effect of trailing-edge shape on the swimming performance of a fish-like swimmer under self-propulsion

Feng, Yikun; Xu, Junxin; Su, Yumin

doi:10.1016/j.oceaneng.2023.115849

Cited by 8 publications

(1 citation statement)

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“…Moreover, from a propulsion point of view, there is still a long way to go in terms of the correct estimation of efficiency, which will have to be achieved by taking into account the difficulty of decoupling thrust from drag [ 8 ]. For a highly adaptive and cost-effective technology, it is crucial to investigate the characteristics of fish that have developed their shapes, swimming techniques, and sensory capabilities over many years of evolution [ 9 , 10 , 11 ]. By studying the parameters involved in fish swimming, such as dimensionless numbers like Reynolds [ 12 ], Strouhal [ 13 , 14 ], Slip [ 15 ], or swimming [ 10 ]—along with hydrodynamic efficiency, drag, and power coefficients [ 8 , 14 , 16 , 17 ]—engineers and biologists can obtain valuable information for the design and performance of bio-inspired swimming devices.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Dimensionless Parameters in Carangiform Fish Swimming Hydrodynamics

Macías,

García-Ortiz,

Oliveira

et al. 2024

Biomimetics

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Research into how fish and other aquatic organisms propel themselves offers valuable natural references for enhancing technology related to underwater devices like vehicles, propellers, and biomimetic robotics. Additionally, such research provides insights into fish evolution and ecological dynamics. This work carried out a numerical investigation of the most relevant dimensionless parameters in a fish swimming environment (Reynolds Re, Strouhal St, and Slip numbers) to provide valuable knowledge in terms of biomechanics behavior. Thus, a three-dimensional numerical study of the fish-like lambari, a BCF swimmer with carangiform kinematics, was conducted using the URANS approach with the k-ω-SST transition turbulence closure model in the OpenFOAM software. In this study, we initially reported the equilibrium Strouhal number, which is represented by St∗, and its dependence on the Reynolds number, denoted as Re. This was performed following a power–law relationship of St∝Re(−α). We also conducted a comprehensive analysis of the hydrodynamic forces and the effect of body undulation in fish on the production of swimming drag and thrust. Additionally, we computed propulsive and quasi-propulsive efficiencies, as well as examined the influence of the Reynolds number and Slip number on fish performance. Finally, we performed a vortex dynamics analysis, in which different wake configurations were revealed under variations of the dimensionless parameters St, Re, and Slip. Furthermore, we explored the relationship between the generation of a leading-edge vortex via the caudal fin and the peak thrust production within the motion cycle.

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