Analysis Of The Influence Hydrofoil On Drag And Lift Coefficient And The Effect On The Ship Resistence

Samosir, Vladimir Arva (2026) Analysis Of The Influence Hydrofoil On Drag And Lift Coefficient And The Effect On The Ship Resistence. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Hydrofoil technology offers a promising approach to improve high-speed vessel performance by generating dynamic lift that raises the hull above the water surface, thereby reducing hydrodynamic resistance. This study analyzes the influence of the NACA 4412 hydrofoil profile on the lift coefficient (CL), drag coefficient (CD), and overall resistance of a slender vessel with a length-to-beam ratio of 16.4 and a design speed of 12.8 m/s (approximately 25 knots). The analysis is conducted through Computational Fluid Dynamics (CFD) simulation in ANSYS Fluent using a pressure-based steady solver and the SST k-ω turbulence model, while hull resistance is computed using the Holtrop and Slender Body methods in Maxsurf Resistance. A two-dimensional CFD analysis of the NACA 4412 profile produced a lift coefficient of 0.575, a drag coefficient of 0.0093, and a lift-to-drag ratio of 61.8 at zero angle of attack. The three-dimensional CFD simulation of the tandem hydrofoil configuration—with a front foil span of 3.35 m and a rear foil span of 2.20 m—generated 65.0 kN of lift on the front foil and 34.6 kN on the rear foil, totaling 99.6 kN, which is sufficient to support the vessel weight of 97.7 kN. Hull resistance at the design speed reached approximately 5.1 kN using the Slender Body method and 5.2 kN using Holtrop. The results indicate that the proposed two-foil layout is capable of lifting the hull out of the water at the design speed, thereby reducing the wetted area and improving overall resistance characteristics.
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Teknologi hydrofoil menawarkan pendekatan yang menjanjikan untuk meningkatkan performa kapal berkecepatan tinggi dengan menghasilkan gaya angkat dinamis yang mengangkat lambung kapal ke atas permukaan air, sehingga mengurangi hambatan hidrodinamik. Penelitian ini menganalisis pengaruh profil hydrofoil NACA 4412 terhadap koefisien gaya angkat (CL), koefisien hambatan (CD), dan hambatan total sebuah kapal ramping dengan rasio panjang terhadap lebar sebesar 16,4 dan kecepatan desain 12,8 m/s (sekitar 25 knot). Analisis dilakukan melalui simulasi Computational Fluid Dynamics (CFD) menggunakan ANSYS Fluent dengan solver steady berbasis tekanan (pressure-based) dan model turbulensi SST k-ω. Hambatan lambung dihitung menggunakan metode Holtrop dan Slender Body pada Maxsurf Resistance. Analisis CFD dua dimensi profil NACA 4412 menghasilkan koefisien gaya angkat sebesar 0,575, koefisien hambatan sebesar 0,0093, dan rasio gaya angkat terhadap hambatan (lift-to-drag ratio) sebesar 61,8 pada sudut serang nol. Simulasi CFD tiga dimensi pada konfigurasi hydrofoil tandem—dengan bentang foil depan 3,35 m dan bentang foil belakang 2,20 m—menghasilkan koefisien gaya angkat sebesar 0,231 untuk foil depan (65,0 kN) dan 0,187 untuk foil belakang (34,6 kN), dengan total 99,6 kN, yang mencukupi untuk menopang berat kapal sebesar 97,7 kN. Hambatan lambung pada kecepatan desain mencapai sekitar 5,1 kN dengan metode Slender Body dan 5,0 kN dengan metode Holtrop. Hasil penelitian menunjukkan bahwa konfigurasi dua foil yang diusulkan, dengan foil depan diletakkan dekat Titik Berat Memanjang (Longitudinal Center of Gravity) dan foil belakang dekat buritan, mampu mengangkat lambung keluar dari air pada kecepatan desain, sehingga mengurangi luas permukaan basah lambung dan memperbaiki karakteristik hambatan secara keseluruhan.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Hydrofoil, NACA 4412, Koefisien Gaya Angkat, Koefisien Hambatan, Hambatan Kapal, CFD, Konfigurasi Foil Tandem, Lift Coefficient, Drag Coefficient, Ship Resistance, Tandem Foil Configuration
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM362 Hydrofoil boats.
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis
Depositing User:	Vladimir Arva Samosir
Date Deposited:	04 Aug 2026 08:21
Last Modified:	04 Aug 2026 08:21
URI:	http://repository.its.ac.id/id/eprint/143395

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