Characterizing the Role of Hind Flippers in Hydrodynamics of A Harbor Seal
Characterizing the Role of Hind Flippers in Hydrodynamics of A Harbor Seal
In this paper, we investigate the hydrodynamic characteristics of harbor seal locomotion, focusing on the role of hind flippers in thrust generation and wake dynamics. Through three-dimensional numerical simulations using an immersed boundary method at Reynolds number of 3000, we analyze the impact of varying Strouhal number (St = 0.2-0.35) and propulsive wavelength ($\lambda^\ast = 1.0-1.2$) on swimming performance. Our findings reveal two distinct wake patterns: a single-row structure at lower Strouhal numbers ($St \leq 0.25$) and a double-row configuration at higher St ($St \geq 0.3$). Increasing wavelength generally enhances thrust production by reducing both pressure and friction of drag components. Additionally, we identify critical vortex interactions between the front and hind flippers, with destructive interference occurring at lower St and constructive patterns emerging at higher St. Circulation analysis confirms stronger vortex formation at higher St and $\lambda^\ast$}, particularly during the left stroke phase. These results provide novel insights into the hydrodynamic mechanisms underlying seal locomotion and contribute to our understanding of efficient aquatic propulsion systems.
Amirhossein Fardi、Hamayun Farooq、Imran Akhtar、Arman Hemmati、Muhammad Saif Ullah Khalid
生物科学理论、生物科学方法生物科学研究方法、生物科学研究技术动物学
Amirhossein Fardi,Hamayun Farooq,Imran Akhtar,Arman Hemmati,Muhammad Saif Ullah Khalid.Characterizing the Role of Hind Flippers in Hydrodynamics of A Harbor Seal[EB/OL].(2025-03-18)[2025-05-17].https://arxiv.org/abs/2503.14612.点此复制
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