Pemodelan gaya hidrodinamika pada sayap stingray dengan lifting line theory

Timbobong, Deus (2008) Pemodelan gaya hidrodinamika pada sayap stingray dengan lifting line theory. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Stingray adalah salah satu alat _marine renewable energy_ yang mengubah energi arus laut menjadi energi listrik. Stingray dikembangkan dan telah dipatenkan oleh Engineering Business Limited dengan nomor paten 6731018. Komponen utama dari Stingray adalah sayap yang menyerupai sayap pesawat terbang, tetapi letaknya di dalam air. Prinsip kerja utama dari Stingray adalah memberikan _angle of attack_ yang positif atau negatif kepada sayap Stingray relatif terhadap arah arus laut, sehingga sayap Stingray akan bergerak naik turun. Salah satu model sederhana yang dapat digunakan untuk memprediksi karakteristik hidrodinamika dan aerodinamika pada sayap berhingga adalah dengan menggunakan teori _lifting line_. Pada teori _lifting line_, vortex yang bersumbu pada sayap disebut _bound vortex_ dan yang berada di belakang sayap disebut _trailing vortices_. _Trailing vortices_ memberikan tambahan _drag_ yang disebut _induced drag_. Tugas akhir ini memodelkan gaya hidrodinamika pada sayap Stingray dengan teori _lifting line_. CFX, yang merupakan program _Computational Fluid Dynamics_ (CFD), digunakan untuk memodelkan _trailing vortices_ dan distribusi tekanan. Hasil penelitian memperlihatkan bahwa selisih hasil perhitungan CFX dengan teori _lifting line_ kurang lebih 10%, dan pengaruh _foil endplates_ adalah mengurangi _induced drag_ sebesar 2%–5%.
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Stingray is one of the marine renewable energy devices that extracts usable electricity from tidal currents. Stingray was developed and patented by Engineering Business Limited, including U.S. Patent 6,731,018. The key component of Stingray is a wing similar to an airplane wing, but designed to operate underwater. The main principle of operation is to apply a positive or negative angle of attack relative to the tidal stream, causing the hydroplane wing to move up and down in an oscillating motion. The simplest quantitative model used to predict hydrodynamic and aerodynamic forces on a wing of finite span is the lifting line theory. The lifting line theory considers the wing to have a bound vortex and two semi-infinite vortex filaments behind the wing called trailing vortices. Trailing vortices induce additional drag, called induced drag. This final project attempts to model the hydrodynamic forces on the wing of Stingray using the lifting line theory. CFX, a Computational Fluid Dynamics (CFD) program, is used to simulate the trailing vortices and pressure distribution. This research shows that the difference between the calculations using CFX and the lifting line theory is approximately 10%, and the use of foil endplates can reduce induced drag by 2%–5%.

Item Type:	Thesis (Other)
Additional Information:	623.812 Tim p
Uncontrolled Keywords:	stingray, lifting line theory, trailing vortices, induced drag, CFX, stingray, lifting line theory, trailing vortices, induced drag, CFX
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM161 Ships--Hydrodynamics
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User:	magang .
Date Deposited:	08 Oct 2026 02:48
Last Modified:	08 Oct 2026 03:05
URI:	http://repository.its.ac.id/id/eprint/145424

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