Studi Analisis Pengaruh Perubahan Posisi dan Ukuran Turbine Duct Terhadap Kinerja Oscillating Water Column (OWC) Berbentuk L

Fahmi, Mohammad (2025) Studi Analisis Pengaruh Perubahan Posisi dan Ukuran Turbine Duct Terhadap Kinerja Oscillating Water Column (OWC) Berbentuk L. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pemanfaatan gelombang laut untuk pembangkitan energi masih menjadi tantangan yang kompleks. Oscillating Water Column (OWC) merupakan salah satu teknologi konversi energi gelombang laut yang paling umum digunakan. Studi ini meneliti pengaruh perubahan posisi dan rasio turbine duct terhadap kemampuan L-OWC dalam menyerap energi. Model L-OWC diuji secara numerik menggunakan softwere ANSYS Fluent dengan validasi berupa data hasil eksperimen pada objek yang sama. Simulasi dilakukan dengan 4 variasi periode gelombang (2,06 s, 2,37 s, 2,69 s, 3,00 s) dan 4 variasi tinggi gelombang (0,125 m, 0,175 m, 0,225 m, 0,275 m). Selain itu, variabel utama dalam penelitian ini adalah 3 macam posisi turbine duct ((A) horizontal membelakangi arah datang gelombang, (B) horizontal menghadap arah datang gelombang, (C) vertikal di atas chamber) serta 3 macam rasio ukuran turbine duct (4%, 7%, 10%). Temuan menunjukkan bahwa performa aerodinamika L-OWC dipengaruhi oleh posisi turbine duct. Posisi duct A menunjukkan kinerja yang baik pada gelombang pendek, posisi duct B unggul pada gelombang panjang. Rasio duct juga berpengaruh terhadap kinerja sistem L-OWC. Rasio 4% secara konsisten menghasilkan airflow velocity tertinggi dengan daya yang kecil, sedangkan rasio 10% menghasilkan airflow velocity terendah dengan potensi daya yang tinggi. Dalam merancang OWC, karakteristik gelombang serta geometri struktur merupakan parameter yang harus diperhatikan karena sangat memengaruhi kinerja sistem.

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The utilization of ocean waves for energy generation remains a complex challenge. The Oscillating Water Column (OWC) is one of the most commonly used wave energy conversion technologies. This study investigates the influence of duct position and duct ratio on the energy absorption capability of an L-OWC system. The L-OWC model was numerically tested using ANSYS Fluent, with validation conducted through experimental data on the same object. Simulations were carried out using 4 variations of wave period (2.06 s, 2.37 s, 2.69 s, and 3.00 s) and 4 variations of wave height (0.125 m, 0.175 m, 0.225 m, and 0.275 m). The primary variables in this study included 3 duct positions: (A) horizontal, facing away from the incoming wave direction, (B) horizontal, facing toward the incoming wave direction, and (C) vertical, located above the chamber, along with 3 duct ratios (4%, 7%, and 10%). The findings indicate that the aerodynamic performance of the L-OWC under various wave parameters is influenced by the duct position. Duct position A demonstrated good performance under short-period waves, while position B was more effective with long-period waves. The duct ratio also significantly affected the L-OWC system’s performance. A 4% ratio consistently produced the highest airflow velocity but generated low power output, whereas a 10% ratio resulted in the lowest airflow velocity with the highest power potential. In designing an OWC system, wave characteristics and structural geometry are critical parameters that must be considered, as they greatly affect overall system performance.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Oscillating Water Column, L-OWC, Posisi Duct, Rasio Duct, Ansys Fluent, Performa Aerodinamika Oscillating Water Column, L-OWC, Duct Position, Duct Ratio, ANSYS Fluent, Aerodynamic Performance
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC147 Ocean wave power.
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Mohammad Fahmi
Date Deposited:	23 Jul 2025 06:19
Last Modified:	23 Jul 2025 06:19
URI:	http://repository.its.ac.id/id/eprint/120870

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