Pengaruh Perubahan Bentuk Lambung Kapal Feri pada Sudut Masuk dan Ducktail di Transom Stern Terhadap Nilai Tahanan Kapal

Mintarso, Cahyadi Sugeng Jati (2023) Pengaruh Perubahan Bentuk Lambung Kapal Feri pada Sudut Masuk dan Ducktail di Transom Stern Terhadap Nilai Tahanan Kapal. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kapal feri adalah merupakan salah satu jenis alat transportasi laut yang mempunyai peran sangat penting dan strategis. Diantara tantangan kinerja kapal feri adalah penurunan kecepatan akibat tahanan kapal. Aspek Energy Efficiency Design Index (EEDI) yang disyaratkan oleh International Maritime Organization (IMO) dalam hal pengurangan tahanan kapal masih dianggap sangat rendah. Selain kecepatan kapal, beberapa faktor yang berpengaruh terhadap besarnya nilai tahanan total adalah bentuk lambung (hull form) dan displacement. Tujuan dari penelitian tesis ini adalah untuk menganalisa efektifitas penurunan nilai tahanan akibat kombinasi perubahan sudut masuk (angle of entrance) dan penambahan perangkat retrofit ducktail pada transom stern. Angle of entrance (iE) adalah sudut masuk garis air pada bagian haluan yang berfungsi untuk meminimalkan tahanan gelombang dan memperbaiki pola aliran, sedangkan ducktail adalah perangkat retrofit tambahan agar aliran yag diteruskan kebelakang kapal menjadi uniform dan untuk mengurangi efek wetted transom yang menyebabkan timbulnya gelombang dan wake sehingga wave making resistance berkurang.
Metodologi dalam penelitian ini adalah metode numerik menggunakan Computational Fluid Dynamics (CFD) dan metode eksperimen dengan pengujian tahanan (resistance test) model kapal di towing tank, yang merupakan salah satu fasilitas pengujian di Pusat Riset Teknologi Hidrodinamika (PRTH)-Badan Riset dan Inovasi Nasional (BRIN).
Analisa hasil simulasi numerik (CFD) dan pengujian tahanan kapal menggunakan desain awal dan desain modifikasi kapal feri ro-ro 1.500 GT. Pengujian tahanan model kapal dilakukan pada satu kondisi sarat (T) = 3,30 m dengan variasi kecepatan (Vs) antara 10 knot sampai dengan 18 knot. Kajian ini dapat menggambarkan karakteristik tahanan yang dialami kapal saat beroperasi pada kondisi sarat dan kecepatan yang ditentukan.
Hasil penelitian menunjukkan bahwa kombinasi modifikasi bentuk lambung kapal pada sudut masuk haluan dan penambahan ducktail di transom stern dengan metode numerik dan eksperimen dapat menurunkan nilai tahanan total kapal (RT) rata-rata sebesar 14,220% dan 14,384%.
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Ferry is one type of sea transportation that has a very important and strategic role. Among the performance challenges of ferries is the decrease in speed due to ship resistance. The Energy Efficiency Design Index (EEDI) aspect required by the International Maritime Organization (IMO) in terms of reducing the ship's resistance is still considered very low. Other than ship speed, several factors that affect the total ship resistance value are hull form and displacement. The purpose of this thesis research is to analyze the effectiveness of reducing the ship resistance value due to a combination of changes in the angle of entrance and the addition of a ducktail retrofit device on the stern transom. The angle of entrance (iE) is the angle of entry to the waterline at the ship bow which serves to minimize wave resistance and improve flow patterns, while the ducktail is an additional retrofit device so that the flow forwarded behind the ship becomes uniform and reduces the wetted transom effect that causes waves and wake so that the wave-making resistance is reduced.
The methodology in this research is a numerical method using Computational Fluid Dynamics (CFD) and an experimental method by ship model resistance test in the towing tank, which is one of the testing facilities at the Hydrodynamic Technology Research Center (PRTH) - National Research and Innovation Agency (BRIN).
Analysis of numerical simulation results (CFD) and ship resistance test using the original and modification design of the 1,500 GT ro-ro ferry. Ship model resistance test is carried out under one condition of the draft (T) = 3.30 m with a speed variation (Vs) between 10 knots to 18 knots. This study can describe the resistance characteristics experienced by ships when operating at the specified draft and speed conditions.
The results showed that the combination of hull shape modification at the bow entry angle and the addition of ducktail at the transom stern, with numerical and experimental methods can reduce the value of the ship's total resistance (RT) by an average of 14.220% and 14,384%.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	angle of entrance, computational fluid dynamics (CFD), ducktail, numerical simulation, resistance test, angle of entrance, computational fluid dynamics (CFD), ducktail, resistance test, simulasi numerik
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM161 Ships--Hydrodynamics
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36101-(S2) Master Theses
Depositing User:	Cahyadi Sugeng Jati Mintarso
Date Deposited:	28 Jul 2023 02:57
Last Modified:	28 Jul 2023 02:57
URI:	http://repository.its.ac.id/id/eprint/100369

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