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

Authors : Arash TAHERİ

Pages : 41-51

Doi:10.33714/masteb.1066936

View : 13 | Download : 6

Publication Date : 2022-03-28

Article Type : Research Paper

Abstract :External morphology insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(tip bump); in the eye bulb region of a scalloped hammerhead shark, Sphyrna lewini , are studied with the aid of computational fluid dynamics insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(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