Wiryawicaksana, Muhammad Yandi (2019) Pemodelan Numerik Gerusan pada Breakwater Tiang Pancang Akibat Gelombang Reguler. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Gerusan atau scouring merupakan salah satu penyebab gagalnya struktur breakwater. Salah satu tipe breakwater adalah tiang pancang. Eksperimen redaman gelombang akibat breakwater tiang pancang telah dilakukan di laboratorium Balai Pantai, Bali. Oleh karena itu Tugas Akhir ini memodelkan secara numerik gerusan pada breakwater tiang pancang sesuai dengan eksperimen Balai Pantai Bali. Pemodelan numerik dilakukan dengan perangkat lunak komputasi dinamika fluida (CFD). Sebanyak 4 modul dimodelkan dengan variasi jarak baris relatif (b/D=0,5;1) dan jarak kolom relatif (B/D=0,5;1) antar struktur tiang pancang. Sedangkan jarak antar kelompok tiang sebesar 33 cm. Validasi model numerik karakteristik gelombang menunjukkan persentase error Havg sebesar 8% untuk wave probe di depan pembangkit gelombang dan 6% untuk wave probe di belakang struktur. Hasil simulasi menunjukkan bahwa kedalaman scouring gap terbesar terjadi pada Modul 1 (b/D=0,5;b/D=0,5) dengan kedalaman 10 cm. Scouring lokal terdalam terjadi pada Modul 1 (b/D=0,5;B/D=0,5) dan Modul 2 (b/D=0,5;B/D=1,0) sebesar 5 cm. Lebar scouring terbesar terjadi pada Modul 1 (b/D=0,5;B/D=0,5) sebesar 11 cm dari tiang paling tengah ke arah hilir. Untuk laju propagasi pada 3 menit pertama scouring sudah menunjukkan hasil yang besar dan pada kisaran waktu 6-15 menit laju propagasi scouring tidak mengalami pertambahan yang signifikan.
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Scouring is one of the causes of the breakwater structure failure. One type of breakwater is a pile. Wave attenuation experiments due to pile breakwater have been carried out in the 'Balai Pantai' laboratory, Bali. Therefor this Final Project models numerically scour on the pile breakwater according to the experiment of the Bali Beach Hall. Numerical modeling is done by computational fluid dynamics (CFD) software. A total of 4 modules are modeled with variations in relative row distance (b / D = 0.5; 1) and relative column distance (B / D = 0.5; 1) between the pile structures. While the distance between the pole groups is 33 cm. The validation of the numerical model wave characteristics shows the percentage of Havg error of 8% for wave probe in front of the wave generator and 6% for the wave probe behind the structure. The simulation results show that the biggest depth of the scouring gap occurs in Module 1 (b / D = 0.5; b / D = 0.5) with a depth of 10 cm. The deepest local scouring occurs in Module 1 (b / D = 0.5; B / D = 0.5) and Module 2 (b / D = 0.5; B / D = 1.0) of 5 cm. The largest scouring width occurs in Module 1 (b / D = 0.5; B / D = 0.5) of 11 cm from the center pole downstream. For the propagation rate in the first 3 minutes scouring has shown great results and in the range of 6-15 minutes the propagation rate of scouring did not experience significant increase.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | scouring, breakwater, tiang pancang, pemodelan numerik, gelombang reguler, jarak antar tiang, perangkat lunak CFD |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC175.2 Sediment transport |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Wiryawicaksana M. Yandi |
| Date Deposited: | 01 Jul 2024 05:16 |
| Last Modified: | 01 Jul 2024 05:16 |
| URI: | http://repository.its.ac.id/id/eprint/69505 |
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