Analisis Pengaruh Grothues Spoiler Tipe NACA5715 Terhadap Nilai Thrust Propeller Pada Kapal Japan Bulk Carrier

Putro, Andrean Prakoso Frans Lukito (2026) Analisis Pengaruh Grothues Spoiler Tipe NACA5715 Terhadap Nilai Thrust Propeller Pada Kapal Japan Bulk Carrier. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Peningkatan jumlah armada kapal niaga dunia berdampak pada meningkatnya konsumsi energi dan emisi gas buang, sehingga diperlukan pengembangan teknologi yang mampu meningkatkan efisiensi propulsi kapal. Salah satu teknologi yang dikembangkan adalah Grothues Spoiler, yaitu Energy Saving Device (ESD) yang dipasang pada daerah buritan untuk memperbaiki distribusi aliran menuju propeller. Penelitian ini bertujuan untuk menganalisis pengaruh pemasangan Grothues Spoiler tipe NACA 5715 terhadap performa propulsi kapal Japan Bulk Carrier, khususnya terhadap perubahan nilai thrust propeller, serta menentukan konfigurasi Grothues Spoiler yang memberikan performa terbaik. Penelitian dilakukan menggunakan metode Computational Fluid Dynamics (CFD) dengan pendekatan Reynolds-Averaged Navier–Stokes (RANS) dan model turbulensi Shear Stress Transport (SST) k–ω menggunakan perangkat lunak ANSYS Fluent. Simulasi dilakukan pada model kapal skala 1:40 dengan kecepatan 1,179 m/s yang memenuhi kesebangunan dinamis pada Froude Number 0,142. Variasi konfigurasi Grothues Spoiler meliputi jumlah spoiler dan angle of attack. Tahap awal penelitian dilakukan melalui analisis resistance test untuk seluruh variasi konfigurasi, kemudian analisis self-propulsion hanya dilakukan pada konfigurasi yang menghasilkan nilai resistance paling rendah sebagai konfigurasi terbaik. Hasil penelitian menunjukkan bahwa pemasangan Grothues Spoiler mampu mengubah karakteristik aliran pada daerah buritan sehingga distribusi aliran menuju propeller menjadi lebih seragam, mengurangi pembentukan vortex, serta meningkatkan performa propulsi kapal. Konfigurasi terbaik diperoleh pada variasi yang menghasilkan nilai resistance paling rendah, yaitu pada konfigurasi Grothues Spoiler 04, dengan 3 Foil serta sudut 0 derajat, dengan penurunan resistance sebesar 3.413%, yang selanjutnya memberikan peningkatan karakteristik interaksi lambung–propeller, meliputi peningkatan thrust propeller sebesar 2.451%, penurunan torsi sebesar 0.782% dibandingkan kondisi tanpa Grothues Spoiler, serta nilai hull efficiency 1.635, relative rotative efficiency 1.059, dan efisiensi propulsi 0.857. Hasil penelitian ini menunjukkan bahwa pemilihan jumlah dan posisi pemasangan Grothues Spoiler merupakan faktor yang sangat menentukan dalam meningkatkan performa propulsi kapal
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The continuous growth of the global merchant fleet has led to increased energy consumption and greenhouse gas emissions, highlighting the need for technologies that can improve ship propulsion efficiency. One of the promising technologies is the Grothues Spoiler, an Energy Saving Device (ESD) installed in the stern region to improve the flow distribution entering the propeller. This study aims to investigate the effect of a NACA 5715 Grothues Spoiler on the propulsion performance of a Japan Bulk Carrier, with particular emphasis on propeller thrust, and to determine the optimal Grothues Spoiler configuration.The study was conducted using Computational Fluid Dynamics (CFD) based on the Reynolds-Averaged Navier–Stokes (RANS) equations coupled with the Shear Stress Transport (SST) k–ω turbulence model in ANSYS Fluent. Simulations were performed on a 1:40 scale model at a speed of 1.179 m/s, corresponding to a Froude number of 0.142, thereby satisfying dynamic similarity requirements. The investigated Grothues Spoiler configurations included variations in the number of spoilers and the angle of attack. An initial resistance analysis was carried out for all configurations, while the self-propulsion analysis was performed only on the configuration that exhibited the lowest resistance. The results demonstrate that the installation of the Grothues Spoiler modifies the stern flow characteristics by producing a more uniform inflow to the propeller, reducing vortex formation, and consequently improving propulsion performance. The optimum configuration was identified as Grothues Spoiler Configuration 04, consisting of three foils with a 0° angle of attack, which achieved a 3.413% reduction in total resistance. This configuration also improved the hull–propeller interaction, resulting in a 2.451% increase in propeller thrust, a 0.782% reduction in propeller torque, a hull efficiency of 1.635, a relative rotative efficiency of 1.059, and an overall propulsive efficiency of 0.857, compared with the baseline configuration without a Grothues Spoiler. These findings indicate that the selection of an appropriate Grothues Spoiler configuration, particularly in terms of the number of foils and their installation position, plays a crucial role in enhancing the propulsion performance of bulk carrier vessels.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	CFD, Efisiensi Propulsi, Grothues Spoiler, Thrust Propeller, CFD, Grothues Spoiler, Propulsion Efficiency Thrust Propeller
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM161 Ships--Hydrodynamics V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM751 Resistance and propulsion of ships V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM753 Propellers
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User:	Andrean Prakoso Frans Lukito Putro
Date Deposited:	05 Aug 2026 01:43
Last Modified:	05 Aug 2026 01:48
URI:	http://repository.its.ac.id/id/eprint/143480

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