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All Journal Mekanika: Majalah Ilmiah Mekanika Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran
Rumapea, Fedrik Immanuel
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Design and Construction of a Leisure Boat Bottom Glass Prototype as An Underwater Panorama Tourism Ride in Karimunjawa Aryadi, Widya; Bahatmaka, Aldias; Karnowo, Karnowo; Rumondang, Juwita Ria; Rumapea, Fedrik Immanuel; Kurniawan, Ahmad Khusom; Kusuma, Anwar Widjaya; Hidayat, Indra Nurul
Rekayasa Vol. 22 No. 1 (2024)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v22i1.13881

Abstract

The lack of proper tourism infrastructure often limits the potential of marine ecotourism. In Karimunjawa, coral reef tourism is a major attraction. However, accessibility remains an issue, especially for visitors who cannot swim or dive. This research focuses on the design and construction of a glass-bottom leisure boat prototype to provide a safe and immersive underwater panorama experience. This study falls within naval architecture and marine engineering, addressing the challenge of designing a stable, efficient, and safe tourism vessel. A key concern in ship design is balancing hydrodynamic efficiency with stability. While monohull boats are common, their transverse stability is relatively low. To overcome this, a catamaran hull configuration was chosen for better stability, larger deck space, and reduced resistance. The prototype was constructed with dimensions of 21.81 m in length, 2.63 m in height, and 7.51 m in width, featuring a glass-bottom viewing area to enhance the tourism experience. Hydrodynamic performance analysis showed an average increase in resistance of 12.39307 N as speed increased, demonstrating the vessel’s efficiency. The construction and testing process confirmed that the catamaran hull improves passenger safety, minimizes capsizing risk, and enhances the underwater viewing experience. This research contributes to sustainable marine tourism by introducing an innovative tourism ride that allows visitors to explore the underwater beauty of Karimunjawa without requiring diving skills. The successful design and construction of this prototype provide a model for future eco-aafriendly tourism vessels.
Performance Analysis of the Fast Platform Supply Vessel with a Conventional V-Hull Shape with the Addition of a Chine and a Different Bow Using Computational Fluid Dynamics Method Rumapea, Fedrik Immanuel; Bahatmaka, Aldias; Hamizan, Banin; Rahardian, Pramudya; Rantisi, Umar Zaid; Kurniaputri, Dias Fitria
Mekanika: Majalah Ilmiah Mekanika Vol 25, No 1 (2026): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v25i1.114601

Abstract

Indonesia is the largest country in Southeast Asia, consisting of more than 17,000 islands and a coastline of approximately 81,000 kilometers, with over half of its territory covered by water. To optimize this vast marine potential for public welfare, comprehensive data collection and mapping are essential. The oil and gas sector remains a key contributor to national revenue. For instance, Pertamina Hulu East Kalimantan (PHKT) exceeded its 2023 production target, achieving around 9,900 barrels of oil and 45 million cubic feet of gas per day. To support offshore operations, a Platform Supply Vessel (PSV) prototype named Bramantya was designed. This study analyzes the vessel using Computational Fluid Dynamics (CFD) to determine the optimal hull form for operational performance and fuel efficiency. Three hull variations were examined: a conventional hull, a hull with additional chines, and a wide-bow hull. The simulation was validated against previous experimental studies, showing consistent linear results with an average error of 4.25%. Simulations at Froude numbers 0.2–0.6 show that the wide downward-bowed hull reduces drag by 7.69% compared to the conventional hull, thereby improving fuel efficiency.
Analysis of Stern Flap Application on Planing Hulls to Reduce Resistance Using CFD Hidayat, Indra Nurul; Bahatmaka, Aldias; Rumapea, Fedrik Immanuel; Exada, Dandi
Mekanika: Majalah Ilmiah Mekanika Vol 25, No 1 (2026): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v25i1.114603

Abstract

Planing hulls exhibit complex hydrodynamic characteristics at high speeds due to two-phase flow interactions, variations in wetted surface area, and nonlinear pressure distributions, making resistance prediction challenging. This study evaluates the effect of stern flap angle and span width on the total resistance of a planing hull under calm-water conditions. Numerical simulations were conducted using a Reynolds-Averaged Navier–Stokes (RANS)-based Computational Fluid Dynamics approach with a k–ε turbulence model and the Volume of Fluid (VOF) method in ANSYS Fluent. The numerical model was validated against a benchmark CFD study previously verified with Fridsma's experimental data, showing deviations below 5% across the investigated Froude number range. Parametric simulations were performed for stern flap angles of 2°, 4°, and 6° with span widths of 43%, 48%, and 53% of the hull breadth. The results indicate that stern flap configuration significantly affects resistance, particularly under full planing conditions. The optimal configuration was obtained at a span of 53% of the hull breadth with a 2° flap angle, reducing the non-dimensional resistance (R/Δ) from 0.186 to 0.1699 (9.69%) at Fr = 1.8. Trim analysis shows an average reduction of 1.16°, contributing to the observed decrease in resistance.
Co-Authors Aldias Bahatmaka Exada, Dandi Hamizan, Banin Hidayat, Indra Nurul Karnowo - Kurniaputri, Dias Fitria Kurniawan, Ahmad Khusom Kusuma, Anwar Widjaya Rahardian, Pramudya Rantisi, Umar Zaid Rumondang, Juwita Ria Widya Aryadi