Syachowi, Achmad (2018) Analisis Pengaruh Variasi Konfigurasi Helical Strakes Pada Aliran Fluida Dan Gerakan Struktur Spar. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
Preview |
Text
04311440000 031-Undergraduate_Thesis.pdf - Accepted Version Download (3MB) | Preview |
Abstract
SPAR (Single Point Anchor Reservoir) merupakan salah satu struktur terapung untuk eksploitasi minyak dan gas di lepas pantai. dalam perkembangannya, hull SPAR dipasang helical strakes untuk mengurangi respon gerakan akibat gaya gelombang dan arus. Tugas akhir ini meneliti tentang pengaruh konfigurasi strakes pada aliran fluida dengan metode CFD dan respn gerak dari SPAR dengan menggunakan bantuan software ANSYS. SPAR keadaan tertambat divariasikan konfigurasi helical strakes nya (number of strakes (1 strake, 2 strakes, dan 3 strakes), 3,2D height of pitch, dan gap (0,05 sampai 0,12D))untuk mengatahui pengaruhnya pada pla aliran dan respon gerakan pada SPAR serta korelasi keduanya guna mendapat konfigurasi helical strakes yang paling optimal. aliran yang ditinjau berkaitan dengan pembentukan vortex shedding, sedangkan gerakan yang ditimjau adalah surge, heave, pitch, dan yaw pada rentan periode 5-40 detik. Didapatkan bahwa aliran semakin tidak teratur seiring penambahan helical strakes yang mengakibatkan vortex shedding menjadi semakin kecil. Adapun pengaruh dari penambahan helical strakes juga mengurangi respn gerakan SPAR menjadi lebih stabil, dan gerakan paling stabil terjadi pada SPAR variasi 3 dengan number of strakes 3, 3,2D height of pitch, dan gap ,0,0625D. Penelitian ini juga mendapatkan bahwa semakin kecil frekuensi vortex shedding maka gerakan yang ditimbulkan akan menjadi lebih kecil. ======================================================================================================================== SPAR (Single Point Anchor Reservoir) is one of the floating structures for offshore oil and gas exploitation. In the development of SPAR hull mounted helical strakes to reduce the movement response due to wave and current forces. This Final Project examines the effect of strakes configuration on fluid flow with the CFD method and the motion response of SPAR using ANSYS software. The SPAR moored condition is varied in its helical strakes configuration (number of strakes (1 strake, 2 strakes, 3 strakes), 3.2D height of pitch, and gap (0.05D to 0.12D)) to determine its effect on fluid flow and motion response on the SPAR as well as the correlation of both to obtain the most optimal helical strakes configuration. The flow under consideration relates to the formation of vortex shedding, while the observed motions are Surge, Heave, Pitch and yaw at 5-40 sec. It is found that the flow is getting irregular as the addition of helical strakes causes the frequency of vortex shedding to become smaller. The influence of the addition of helical strakes also reduces the response of SPAR movements to be more stable, and the most stable movement occurs in SPAR variation 3 with number of strakes 3, height of pitch 3.2D, and 0,0625D gap. The study also found that the smaller the frequency of vortex shedding, make the smaller motion.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | SPAR, Helical Strakes, Moored, CFD, Motion, Vortex Shedding |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | ACHMAD SYACHOWI |
| Date Deposited: | 24 Jun 2021 04:38 |
| Last Modified: | 24 Jun 2021 04:38 |
| URI: | http://repository.its.ac.id/id/eprint/54777 |
Actions (login required)
 |
View Item |