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Volume 21, Issue 48 (12-2025)                   marineeng 2025, 21(48): 109-120 | Back to browse issues page

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Riyazati Y, Hejranfar K. Bio-Inspired Design and Hydrodynamic Analysis of an Exploratory Underwater Vehicle Based on Body Shape of the Longnose Spearfish. marineeng 2025; 21 (48) :109-120
URL: http://marine-eng.ir/article-1-1240-en.html
Bio-Inspired Design and Hydrodynamic Analysis of an Exploratory Underwater Vehicle Based on Body Shape of the Longnose Spearfish
Yousef Riyazati1 , Kazem Hejranfar *2
1- Sharif University of TechnologyAerospace Engineering Department
2- Sharif Universit of Technology
Abstract:   (421 Views)
The longnose spearfish, one of the fastest ocean predators and a member of the billfish family, can reach speeds of about 110 km/h. It possesses a slender and highly hydrodynamic body that reduces flow disturbances, minimizes drag, and enhances motion stability. In this study, the design of an exploratory underwater vehicle inspired by the overall body form of the longnose spearfish is investigated. First, the morphological and hydrodynamic characteristics of the longnose spearfish and the flow behavior around its general body shape are examined, particularly at its maximum swimming speed of 31 m/s, as well as at lower speeds for the validation with the available experimental results. Subsequently, using its general body shape and applying proper geometric modifications, an initial model of the underwater vehicle is designed and developed. The appropriate location, installation angle, and number of control surfaces compatible with the body structure of the spearfish are then analyzed. Numerical simulations are carried out for the designed bio‑inspired underwater vehicle at different speeds and the results are compared with those of a reference geometry having nearly the same wetted surface area. The numerical results show that the drag coefficient of the bio‑inspired geometry is approximately between %31 to %52 lower than that of the existing underwater vehicle geometry. This finding indicates that applying bio‑inspired design principles can significantly improve hydrodynamic performance and may contribute to the development of more efficient underwater systems and propulsion technologies for marine applications.
 
Keywords: Bio-inspired design, Hydrodynamic analysis Submersible hull optimization, Drag reduction, Sailfish morphology
Full-Text [PDF 1811 kb]   (86 Downloads)    
Type of Study: Research Paper | Subject: Submarine Hydrodynamic & Design
Received: 2026/02/5 | Accepted: 2026/05/11
فایل صوتی چکیده مقاله [MP3 2723 KB]  (39 Download)
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