Evaluasi Numerik Performa Ducted Wec Sebagai Supporting Structure Pada Sistem Konversi Energi Gelombang Pecah

Assidiq, Fuad Mahfud (2021) Evaluasi Numerik Performa Ducted Wec Sebagai Supporting Structure Pada Sistem Konversi Energi Gelombang Pecah. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pesatnya riset dan pengembangan konstruksi bangunan laut menjadikan sektor teknologi energi laut semakin inovatif. Salah satu jenis energi laut yang
paling berkembang industri konstruksinya ialah energi gelombang laut. Keunggulan mengekstraksi energi gelombang laut karena lebih konstan, lebih dapat diprediksi, dan kepadatan energi yang lebih tinggi. Ketika penjalaran energi gelombang laut mendekati perairan dangkal, peristiwa gelombang pecah pun terjadi dimana tingginya kecepatan fluida yang terdisribusi secara acak. Selain itu, dengan penerapan teknologi ekstraksi gelombang pecah ini menjadi suatu pilihan baru industri energi di Indonesia.
Atas dasar pemanfaatan energi gelombang pecah di perairan dangkal, maka diperlukan suatu struktur pengkonversi energi dari gelombang pecah bernama Ducted WEC yang merupakan teknologi terkini asal Jepang. Untuk mengetahui pengaruh kinerja Ducted WEC lebih detail maka Kepulauan Spermonde Sulawesi Selatan dipilih menjadi daerah percontohan dimana
pemodelan numerik dilakukan berbasis kombinasi komputasi dinamika fluida (CFD) dan metode elemen hingga (FEM) dalam bentuk skema tangki pembangkit gelombang numerik (NWT).
Untuk menghasilkan hasil pemodelan numerik gelombang pecah yang akurat, maka data hasil eksperimen dari tangki pembangkit gelombang fisik menjadi parameter pembanding validasian dengan nilai R2, Skill, dan MAPE sebesar 0.991, 0.998 dan 3.402 untuk tinggi gelombang signifikan, sedangkan kedalaman air rerata masing-masing senilai 0.980, 0.993, dan 5.392. Kemudian,
desain struktur Ducted WEC akan lebih optimal daripada struktur eksisting dengan memilih lokasi yang nilai parameter nondimensi gelombang pecah lebih
besar, meningkatkan nilai parameter panjang struktur relatif serta mengecilkan nilai parameter luasan outlet relatif. Disamping itu, performa Ducted WEC
sebagai struktur pelindung pantai cukup efektif dalam meredam tinggi gelombang dengan nilai rerata koefisien transmisi gelombang berkisar 67%. Berdasarkan
investigasi analisis global akibat pembebanan dinamis acak, struktur Ducted WEC relatif aman berdasarkan regulasi American Concrete Institute (ACI).
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The interest in research of ocean construction has been growing rapidly, thus bringing to a development sector of ocean energy technology more innovative. One of the most ocean energy developed was wave energy that is more constant, predictable and higher density than other ocean energies. When the wave energy propagates to shallow water, the phenomenon of breaking waves occur where the fluid velocities are distributed randomly. At the same time, the advanced technology of harnessing breaking waves is an proper option for Indonesian energy sector.
In addition to this case, the latest Japanese technology, Ducted WEC, is applied and modified depend on Indonesian fringing reefs. In order to determine of Ducted WEC performance specifically, the South Sulawesi Spermonde Island was selected as a numerical pilot project in numerical wave tank (NWT) scheme. A computational fluid dynamics (CFD) analysis was used to capture the breaking wave and impact behavior of fluid on the Ducted WEC while a finite element method (FEM) was used to determine the deformation of structure due to breaking wave loads.
The established model is firstly validated with experiment results under
R2, Skill, and MAPE of 0.991, 0.998 and 3.402 for significant wave height results,
and the mean water depth parameters are about 0.980, 0.993, and 5.392
respectively. The Ducted WEC is then became more optimal than existing model
due to choosing a site location where breaking wave non-dimensional parameters
are greater, increasing relative length parameter, and reducing relative outlet area. It is also evident that Ducted WEC’s performance in terms of coastal protection structure followed the expectations. The measured mean wave transmission coefficient was 67%. According to the global structural analysis due to dynamic random loads, the whole structural safety was under capacity of marine concrete material based on American Concrete Institute (ACI) regulations.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Ducted, gelombang pecah, tangki pembangkit gelombang numerik
Subjects:	Q Science > QA Mathematics > QA911 Fluid dynamics. Hydrodynamics T Technology > TC Hydraulic engineering. Ocean engineering > TC147 Ocean wave power.
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38101-(S2) Master Thesis
Depositing User:	Fuad Mahfud Assidiq
Date Deposited:	08 Mar 2021 04:12
Last Modified:	08 Mar 2021 04:15
URI:	http://repository.its.ac.id/id/eprint/83756

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