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INDONESIA
KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan
Published by Universitas Diponegoro
ISSN : 18298370     EISSN : 23019069     DOI : 10.14710/kapal.
Core Subject : Science,
Earth & Planetary Sciences
Jurnal ini merupakan Jurnal Ilmiah untuk mengembangkan ilmu dibidang Ilmu Pengetahuan & Teknologi Kelautan. Jurnal ini diterbitkan oleh Teknik Perkapalan Universitas Diponegoro 3 (tiga) kali dalam 1 tahun pada bulan Februari, Juni dan Oktober.
Arjuna Subject : -
Articles 413 Documents
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A Comprehensive Study of Renewable-Powered Floating Oil Skimmer Design for Indonesian Oil Spill Recovery Yasim, Ahmad; Irsan, Muhammad; Dwiprayuda, Marfiansyah Nasra; Ikhsan, Muh.; Zulkifli, Muh. Fadil
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 23, No 1 (2026): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v23i1.79027

Abstract

Indonesian waters have intense shipping and offshore oil industry activities, often resulting in marine pollution from oil spills. These spills damage marine ecosystems, disrupt sea transportation, cause organism mortality and migration, and reduce fishery production as well as marine tourism. To mitigate oil pollution, oil skimmers are widely used. However, their current applications mostly rely on generator-based electric power and are limited to land-based industrial environments. This study aims to develop a floating oil skimmer powered by renewable energy for marine oil spill recovery, utilizing the abundant solar and wind resources available at sea. The research employs a design-based approach combined with model testing to enhance the accuracy of calculation inputs. The results indicate that the barge-type platform provides optimal performance due to its high buoyancy, low resistance, and good stability and seakeeping characteristics. The oil skimmer integrates a corrugated plate interceptor (CPI) separator to accelerate the oil–water separation process. Two 100 Wp solar panels supply electrical power stored in two 12 V, 32 Ah hybrid batteries, which operate an oily water pump, a DC 775 motor for the skimmer drum, and a cooling system pump to prevent component overheating. Experimental results show the highest efficiency at 120 RPM, with an average oil recovery rate of 2.2 mL per revolution, equivalent to 15.84 L/h or 380.16 L/day. Further improvements are recommended by optimizing the skimmer material, adjusting its position, refining the oil scraper, and adding an oil skimmer unit in Chamber 1.
Optimization of Inner Bilge Design to Enhance Cargo Tank Capacity in Tankers Yulianto, Ardi Nugroho; Winarko, Raybonda Reinaldi; Pasaribu, Sheely Leony Artha; Ahmad, Roisul Fadli; Adietya, Berlian Arswendo; Hasanudin, Hasanudin
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 23, No 1 (2026): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v23i1.82683

Abstract

The world of shipping industry keeps evolving to develop the most efficient ship designs, including tanker ship designs. According to MARPOL Annex 1 Regulation 19, oil tankers over 600 deadweight and built after 6 July 1996 must have wing tank and double bottom structures, which significantly reduce the cargo hold volume. Therefore, the objective of this research is to optimize the cargo hold volume by converting the conventional sloped hopper into a rounded inner bilge configuration. The optimization problem is formulated with the cargo oil tank volume as the objective function to be maximized. The design variables include the inner bilge radius and the positions of two cargo landing points at each knuckle along the cargo oil tank, defined in transverse and vertical coordinates. The constraints consist of regulatory and design requirements, including clearance, stability, freeboard, and longitudinal strength. Grid search method is employed to systematically evaluate all possible combinations of design variables, ensuring identification of the global optimum. The optimisation process is automated using Visual Basic for Applications (VBA) integrated with ship modelling software. The research resulted in a new design that increased the cargo oil tank volume by 0.960%. A sister ship with the same payload could be built with an optimized cargo oil tank design configuration by reducing the length of the cargo oil tanks and the ship itself. However, this improvement comes with a trade-off in terms of practical applicability during the shipbuilding process.
CFD-Based Analysis of Wingsail Shape and Placement on a Fishing Vessel in Southern Bali Waters Sukmawardana, Happy Nabila; Suwarni, Endah; Purnamasari, Dian; Utina, Mohammad Ridwan; Rina, Rina; Setiyobudi, Nanang; Sulistyawati, Wiwin
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 23, No 1 (2026): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v23i1.82416

Abstract

The maritime transportation sector contributes significantly to atmospheric emissions due to its reliance on fossil fuels, underscoring the need for more energy-efficient, environmentally friendly propulsion technologies. One promising solution is Wind-Assisted Ship Propulsion (WASP), which uses wind energy as a supplemental power source for vessel propulsion. Among various WASP technologies, wingsails have attracted attention for their rigid airfoil geometry and their ability to generate aerodynamic lift efficiently. This study aims to investigate the influence of wing sail shape and placement on aerodynamic performance, to identify an effective configuration for vessel applications. Computational Fluid Dynamics (CFD) simulations are conducted using k-  SST turbulence model. Two symmetric airfoil profiles, NACA 0012 and NACA 0015, are examined under angle of attack variations of 5°, 0°, 5°, 10°, 15°, and 20°. The wingsail is modeled in two installation configurations: midship and a combined midship-aft arrangement. Simulations are performed at wind speeds of 4 m/s, 10 m/s, 13.7 m/s, and 17.2 m/s, with aerodynamic performance evaluated based on the lift and drag coefficients. Based on the results, the NACA 0015 wingsail shows more stable aerodynamic behavior than the NACA 0012, while medium wind speeds in the range of 10–13.7 m/s offer the best balance between lift and drag. In addition, the midship–aft wingsail arrangement consistently generates higher lift than the single midship configuration, making the NACA 0015 wingsail with midship–aft placement the most suitable choice for fishing vessel applications.

Page 42 of 42 | Total Record : 413

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