On the Hydrodynamic Effects of the Eidonomy of the Hammerhead Shark’s Cephalofoil in the Eye Bulb Region: Winglet-Like Behaviour

Year 2022, Volume: 11 Issue: 1, 41 - 51, 28.03.2022

Arash Taheri

https://doi.org/10.33714/masteb.1066936

Abstract

External morphology (eidonomy) of marine creatures, developed by the evolution process over the course of millions of years, plays a crucial role in their locomotion and swimming performance. In this paper, hydrodynamic impacts of the cephalofoil tip eidonomy (tip bump) in the eye bulb region of a scalloped hammerhead shark, Sphyrna lewini, are studied with the aid of computational fluid dynamics (CFD). In this regard, two separate geometries are designed here; one corresponding to the real geometry of the hammerhead shark’s cephalofoil with a tip bump (eye bulb region) and another one, a modified version with a flat tip without the aforementioned bump. Turbulent flows encountered in the problem are simulated using the Lam-Bremhorst turbulence model at different angles of attack (AoA) and a sideslip angle, at high Reynolds number, 106, corresponding to the swimming of a juvenile hammerhead shark with a speed of 1 m/s. The results show that the strength (circulation) of the wing tip vortices reduces by the external geometry of the hammerhead’s cephalofoil tip; in this sense, ‘cephalofoil tip’ with its unique morphology behaves as a winglet.

Keywords

Cephalofoil, Hammerhead sharks, Bionic winglet, CFD, Functional eidonomy, Ichthyology

Thanks

The author would like to sincerely acknowledge every single effort done by institutes, organizations and individuals for the protection of ‘hammerhead sharks’ worldwide.

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