Ridlwan, Asfarur (2019) Optimalisasi Bentuk Pemecah Gelombang Apung Dengan Metode Computational Fluid Dynamics (CFD). Masters thesis, Institut Teknologi Sepuluh Nopember.
Preview |
Text
04311850010008-Master_Thesis.pdf Download (9MB) | Preview |
Abstract
Pemecah gelombang merupakan salah satu struktur pantai yang dibangun dengan tujuan untuk melindungi daerah pantai terhadap gelombang. Struktur ini umumnya dirancang untuk melindungi kapal dan fasilitas yang berada di Pelabuhan. Pemecah gelombang yang sering diterapkan adalah pemecah gelombang konvensional seperti tipe rubble mound. Perubahan iklim yang menyebabkan adanya variasi pasang surut dan ketinggian permukaan air laut yang cenderung berubah sewaktu-waktu, serta kondisi tanah yang tidak cocok menerima beban struktur yang cenderung besar akan memakan biaya dan lebih ekonomis jika menggunakan floating breakwater, apalagi jika di terapkan pada kedalaman lebih dari 3 meter. Seiring waktu, permintaan pembangunan floating breakwater meningkat sehingga para ilmuwan dan insinyur banyak melakukan pengembangan penelitian baik secara eksperimen fisik maupun model numerik. Dalam penelitian ini dilakukan permodelan numerik dengan bantuan software Flow 3D dimana menerapkan metode Computational Fluid Dynamics (CFD). Validasi dilakukan dengan membandingkan model regular pontoon (RG) uji eksperimen dan simulasi numerik. Terdapat tiga pengembangan model floating breakwater guna untuk mengoptimalkan nilai koefisien transmisi yaitu square notch (SQ), circular notch (CN), dan triangular notch (VN). Model di uji dengan gelombang non linear stokes orde 2 dengan rentang nilai kecuraman gelombang (H/gT2) antara 0.0016 hingga 0.0031. Area uji simulasi berupa wave flume dengan dimensi 10 m x 0.6 m x 0.8 m (panjang, lebar, tinggi) dengan kedalaman elevasi air tenang sebesar 0.615 m. Hasil validasi model menunjukan tervalidasi dengan tingkat kesalahan sebesar 8,5% sehingga dapat dilakukan simulasi ketiga model pengembangan floating breakwater. Dari keseluruhan hasil simulasi pengembangan model floating breakwater diperoleh bahwa struktur SQ merupakan struktur paling optimal dengan koefisien transmisi rata-rata sebesar 0.6248. Sedangkan, koefisien transmisi rata-rata struktur CN dan VN masing-masing sebesar 0.6886 dan 0.6735.
=============================================================================================================================
Breakwater is one of coastal structures that was built to protect the coastal area against waves. This structure is generally designed to protect ships and facilities at the Port. Breakwaters that are often applied are conventional breakwaters such as the rubble mound type. Climate change that causes tidal variations and sea level height which tends to change at any time, as well as unsuitable soil conditions to receive large structural loads will be costly and more economical if using floating breakwater, especially if applied at deeper depths from 10 ft. Over time, the demand for floating breakwater development increased so that scientists and engineers did a lot of research development both in physical experiments and numerical models. In this research numerical modeling is done with the help of Flow 3D software which applies the Computational Fluid Dynamics (CFD) method. Validation is done by comparing the regular pontoon (RG) model of experimental tests and numerical simulations. There are three floating breakwater model developments in order to optimize the transmission coefficient value, namely square notch (SQ), circular notch (CN), and triangular notch (VN). The model was tested with second order non linear stokes waves with a range of wave steepness values (H/gT2) between 0.0016 to 0.0031. The simulation test area is a wave flume with dimensions of 10 m x 0.6 m x 0.8 m (length, width, height) with a calm water elevation depth of 0.615 m. The result of the model validation shows that it is validated with an error rate of 8.5% so that it can do a simulation of the three floating breakwater development models. From the overall simulation results of the development of the floating breakwater model it is found that the SQ structure is the most optimal structure with an average transmission coefficient of 0.6248. Meanwhile, the average transmission coefficient of the CN and VN structures were 0.6886 and 0.6735, respectively.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Breakwater, Computational Fluid Dynamics, Floating Breakwater, Flow 3D, Koefisien Transmisi, Pemecah Gelombang Apung, Volume of Fluid |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC333 Breakwaters T Technology > TC Hydraulic engineering. Ocean engineering > TC363 Floating harbors. Including floating docks, piers, etc |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38101-(S2) Master Thesis |
| Depositing User: | Asfarur Ridlwan |
| Date Deposited: | 31 Oct 2024 09:56 |
| Last Modified: | 31 Oct 2024 09:56 |
| URI: | http://repository.its.ac.id/id/eprint/72751 |
Actions (login required)
 |
View Item |