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All Journal International Journal of Marine Engineering Innovation and Research
Achdri Fauzi Nugraha Oloan
Study Program of Ship Manufacturing Engineering, Politeknik Negeri Banyuwangi, Banyuwangi, 68461, Indonesia
Automotive Engineering Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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CFD-Based Comparative Study of Axe Bow and Bulbous Bow Designs for Corvette Warship Deployment in Natuna Waters Yeddid Yonatan Eka Darma; Reyhan Arfananda Sugiarto; Achdri Fauzi Nugraha Oloan; Fajri Narotama
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 3 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i3

Abstract

The Natuna Sea is considered a prime maritime area for Indonesia, bearing strategic and defense significance, besides its turbulent sea conditions demand warships to adopt or be provided with efficient and stable hull forms. Thus, this study is intended to investigate the most appropriate bow designs for a corvette warship operating in the Natuna region. Three types of bow are compared: a conventional V-hull, sloped bow, bulbous bow and axe bow. Comparison through Computational Fluid Dynamics (CFD) simulation, validated with Holtrop and Savitsky empirical methods, at the speed of 30 knots. Principal dimensions of the corvette were obtained through regression analysis from 20 other warships that belong to the same class. Results reveal that the axe bow has the smallest resistance, that is, 365.18 kN from Holtrop method and 374.27 kN from CFD in contrast to 384.43 kN owing to conventional bow design. It also fulfills all criteria of operation performance and fuel efficiency. Hence, it is considered the best alternative for corvette deployment into the Natuna Sea.
Influence of Ducted Propeller on Ro-Ro Vessels for Indonesia Inter-island Transportation Achdri Fauzi Nugraha Oloan; Prabuditya Bhisma Wisnu Wardhana; Agung Fauzi Hanafi; Yeddid Yonatan Eka Darma
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 4 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i4

Abstract

These Ro-Ro vessels are the backbone of inter–island transportation in Indonesia and require an efficient propulsion system to reduce fuel consumption and improve maneuvering performance. This study investigates the influence of ducted propellers on Ro-Ro vessels using Computational Fluid Dynamics (CFD) simulations. Four blades fixed pitch propeller configuration with accelerating duct are examined with different radial gaps at the propeller tip to the inner duct surface (0.1m, 0.3m and 0.5m) at rotational speed of 229 rpm and diameter of 4.202 m. the CFD model validation show average deviation of 4.06 % for KT, 7.63 % for 10*KQ and 3.11 % for efficiency compared with the experimental data. It indicated that the numerical approach is sufficiently reliable for further analysis. The open-water test results suggest that adding a duct does not necessarily improve performance. At a 0.10m gap, thrust, torque, and efficiency decrease by 39.3%, 25.7%, and 20.3%, respectively, whereas the 0.5m gap still results in noticeable performance degradation. Wake-field visualization indicates that smaller gaps produce stronger propeller–duct interaction, with more concentrated energy, sharper velocity gradients, and greater instability near the duct outlet. These findings emphasize that duct geometry and tip clearance must be carefully optimized for the vessel’s operating conditions to fully realize the energy benefits of a ducted propeller system on Ro-Ro vessels.
Co-Authors Agung Fauzi Hanafi Fajri Narotama Prabuditya Bhisma Wisnu Wardhana Reyhan Arfananda Sugiarto Yeddid Yonatan Eka Darma Yeddid Yonatan Eka Darma