Studi Numerik Kinerja Integrasi Oscillating Water Column pada Composite Breakwater

Ramadina, Alifah Nur Fauziyah Ramadina (2025) Studi Numerik Kinerja Integrasi Oscillating Water Column pada Composite Breakwater. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Oscillating Water Column (OWC) merupakan salah satu teknologi konversi energi gelombang laut yang banyak dikembangkan karena struktur dan prinsip kerjanya yang sederhana. Dalam penelitian ini, dilakukan studi numerik untuk menganalisis pengaruh variasi geometri pada efisiensi konversi energi OWC yang terintegrasi dengan breakwater. Tiga aspek geometris yang divariasikan adalah: (1) bentuk ramp di depan chamber, (2) kedalaman submergensi bukaan chamber, dan (3) sudut kemiringan dinding chamber. Variasi bentuk ramp bertujuan untuk memodifikasi aliran masuk agar menghasilkan tekanan osilasi yang lebih stabil. Kedalaman submergensi bukaan diteliti untuk mengetahui seberapa besar pengaruh penetrasi inlet terhadap osilasi kolom air di dalam chamber. Sementara itu, variasi sudut chamber digunakan untuk mengevaluasi pengaruh sudut terhadap refleksi gelombang dan volume udara yang terkompresi. Simulasi dilakukan menggunakan metode Computational Fluid Dynamics (CFD) dengan pendekatan multiphase VOF (Volume of Fluid) pada domain dua dimensi, serta validasi dilakukan dengan mengacu pada data eksperimen dan model numerik yang tersedia dalam literatur. Hasil simulasi dianalisis berdasarkan tekanan dan kecepatan aliran udara yang terbentuk, serta efisiensi energi yang dihitung dari produk tekanan dan debit udara selama satu periode. Penelitian ini diharapkan dapat memberikan wawasan desain geometris yang lebih optimal dalam pengembangan teknologi OWC di perairan Indonesia.
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The Oscillating Water Column (OWC) is one of the most widely developed wave energy conversion technologies due to its simple structure and working principle. This study presents a numerical investigation on the influence of geometric variations on the energy conversion efficiency of an OWC system integrated into a breakwater. Three geometric parameters are examined: (1) the ramp structure placed in front of the chamber, (2) the submergence depth of the chamber opening, and (3) the inclination angle of the chamber wall. The ramp structure is introduced to modify incoming wave flow and stabilize oscillating pressure inside the chamber. The submergence depth variation aims to explore the effect of inlet penetration on water column oscillation, while the chamber angle variation evaluates its role in wave reflection and air compression volume. The simulations are conducted using Computational Fluid Dynamics (CFD) with a multiphase Volume of Fluid (VOF) approach in a two-dimensional domain. The model is validated using experimental and numerical data available in the literature. The simulation results are analyzed in terms of pressure fluctuation and air velocity generated within the chamber, and energy efficiency is calculated as the time-integrated product of pressure and airflow rate over one wave period. This research is expected to contribute insights for optimizing OWC geometric design for application in Indonesian coastal waters.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Oscillating Water Column (OWC), Computational Fluid Dynamics (CFD), Energi Gelombang, Oscillating Water Column (OWC), Computational Fluid Dynamics (CFD), Wave Energy
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA357 Computational fluid dynamics. Fluid Mechanics
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Alifah Nur Fauziyah Ramadina
Date Deposited:	21 Jul 2025 07:14
Last Modified:	21 Jul 2025 07:14
URI:	http://repository.its.ac.id/id/eprint/120329

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