Studi Numerik Pengaruh Penggunaan Hydrofoil pada Kapal Katamaran terhadap Seakeeping Kapal

., Agung (2021) Studi Numerik Pengaruh Penggunaan Hydrofoil pada Kapal Katamaran terhadap Seakeeping Kapal. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kapal cepat katamaran saat ini banyak digunakan sebagai kapal militer maupun kapal
penumpang dikarenakan kapal katamaran memiliki kualitas stabilitas yang baik dan hambatan
yang lebih kecil dibandingkan kapal monohull. Namun demikian, kapal cepat katamaran
memiliki keterbatasan terkait kualitas seakeeping saat kapal beroperasi pada daerah perairan
yang bergelombang. Sehingga saat ini banyak digunakan hydrofoil pada kapal katamaran untuk
mengatasi keterbatasan tersebut. Oleh sebab itu, pada penelitian ini akan dilakukan analisis
mengenai pengaruh penggunaan hydrofoil pada kapal katamaran terhadap seakeeping kapal.
Metode analisis yang digunakan yaitu secara numerik menggunakan Computational Fluid
Dynamics (CFD) yang mengadopsi 3D diffraction theory dalam melakukan analisis seakeeping
pada kapal. Sebuah kapal penumpang katamaran dengan hydrofoil dengan tipe NACA 641-212
dengan sudut serang 4 derajat akan digunakan dalam penelitian ini. Posisi peletakan hydrofoil
dioptimasi untuk memperoleh posisi foil yang optimum dalam mengurangi respon gerakan
kapal. Analisis numerik dilakukan pada dua kondisi yaitu, pada kapal katamaran tanpa
hydrofoil, dan dengan penambahan dua hydrofoil dimana satu hydrfoil di buritan dan satu
hydrofoil lainnya di haluan kapal. Beradasarkan hasil yang diperoleh menunjukkan bahwa pada
saat kondisi kapal diam, penggunaan hydrofoil tidak terlalu memberikan pengaruh terhadap
respon gerakan kapal, dikarenakan hydrofoil belum menghasilkan lift apabila kapal masih
dalam kondisi diam. Namun ketika kapal beroperasi dengan kecepatan dinas, penggunaan
hydrofoil mampu mengurangi amplitudo signifikan gerakan kapal. Hal tersebut dibuktikan
dengan terjadinya pengurangan nilai amplitudo signifikan maksimum pada gerakan heaving
yang terjadi pada arah gelombang 180 derajat dengan pengurangan sebesar 5.46%, pada gerakan
pitching yang terjadi pada arah gelombang 180 derajat dengan pengurangan 10.88%, dan pada
gerakan rolling yang terjadi pada arah gelombang 90 derajat dengan pengurangan sebesar 4.11%.
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Recently high-speed catamaran vessels are widely used as military and passenger ship because
catamaran vessels provide better stability and less resistance than monohull. However, highspeed catamaran vessels have limitations, as insufficient seakeeping quality in rough seas. The
use of hydrofoil is starting to be widely applied for high speed catamaran vessels to improve
their seakeeping quality. In this paper, the effects of hydrofoil applied on catamaran ship hull
are studied in relation to seakeeping of the ship. The seakeeping analyses are conducted
numerically by using Computational Fluid Dynamics (CFD) which means 3D Diffraction
theory is adopted for introducing the seakeeping of the ship. A catamaran passenger ship
installed by hydrofoil type of NACA 641-212 with an angle of attack of 4deg is used for the
simulations. The position of hydrofoil is optimized to gain the optimum hydrofoil position for
reducing ship motions. Numerical analyzes are carried out for two conditions: a catamaran
without hydrofoil and with the addition of two hydrofoils i.e. on the bow and stern of the ship.
The results show when the ship is stationary, the application of hydrofoil does not have a major
effect on the ship motions, because the foil has not yet produce lift force when the ship is
stationary. When the ship operates at service speed, the application of hydrofoil can reduce the
catamaran ship motions. This is evidenced by a reduction of the maximum significant amplitude
value of the heaving motion that occurs in the 180deg heading angle with 5.46% reduction, the
pitching motion that occurs in the 180deg heading angle with 10.88% reduction, and the rolling
motion that occurs in the 90deg heading angle with 4.11% reduction.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Catamaran, Hydrofoil, Numerical simulations, Seakeeping, Katamaran, Hydrofoil, Seakeeping, Simulasi Numerik
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM156 Naval architecture V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM161 Ships--Hydrodynamics V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM311 Catamarans. V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM362 Hydrofoil boats. V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM381 Passenger ships
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis
Depositing User:	. Agung
Date Deposited:	04 Mar 2021 01:10
Last Modified:	04 Mar 2021 01:11
URI:	http://repository.its.ac.id/id/eprint/83380

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