Shaleh, Ricky Fadhilla (2015) Analisis Sloshing Pada Independent Supporting Tank Tipe C LNG Carrier Secara Melintang Akibat Gerakan Swaying, Heaving, Dan Rolling Dengan Metode Computational Fluid Dynamics. Undergraduate thesis, Institut Technology Sepuluh Nopember.
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Abstract
Sloshing merupakan perpindahan dari suatu cairan akibat eksitasi tangki oleh gaya luar yang
dipengaruhi oleh permukaan bebasnya. Berdasarkan IGC Code, dalam perencanaan tangki
pada kapal dengan muatan liquid gases, salah satu parameter yang dipertimbangkan adalah
beban akibat sloshing. Analisis ini bertujuan untuk mengetahui besarnya pressure yang terjadi
pada dinding tangki LNG jenis Independent Self Supporting Tank dengan bentuk Bilobe, yang
diakibatkan oleh spektra respons Sway, Heave, dan Roll pada daerah pelayaran Bontang -
Samarinda. Pemodelan tangki dilakukan secara 2D dengan ukuran lebar separuh tangki 6,65
m dan tinggi 6,9 m dengan software GAMBIT. Simulasi sloshing dilakukan menggunakan
software FLUENT dengan filling level 10%, 50%, dan 90% dari ketinggian tangki. Pengaruh
efek sloshing yang terjadi pada tangki observasi merupakan kombinasi dari nilai input spektra
respons sway, heave, dan roll. Kombinasi tersebut memiliki nilai maksimum pada rentang
frekuensi antara 0.8 - 1.2 [rad/s] yaitu masing – masing sebesar 0.763 [m2(rad/s)], 1.005
[m2(rad/s)], serta 20.197 [deg2(rad/s)]. Spektra respons tersebut menghasilkan pengaruh beban
sloshing terbesar pada dinding tangki long. bulkhead untuk kondisi filling level 50% yaitu
sebesar 6.89% atau 253.8503 [Pa] dari total pressure pada kondisi filling level yang sama yang
bernilai 3684.823 [Pa]. Nilai tersebut lebih besar daripada presentase pengaruh nilai dynamic
pressure maksimum untuk kondisi filling level 90% yang terjadi pada long. bulkhead yaitu
sebesar 1.95% atau sebesar 319.2278 [Pa] dari nilai total pressure pada kondisi filling level
tersebut yaitu 16349.56 [Pa]. Sedangkan pengaruh filling level terhadap peningkatan beban
sloshing yang signifikan adalah pada dinding tangki long. bulkhead untuk tiap variasi filling
level 10%, 50%, dan 90% yaitu berturut turut sebesar 1.222938 [Pa], 253.8503 [Pa], dan
319.2278 [Pa]. Peningkatan nilai tersebut memliki nilai yang lebih signifikan dibandingkan
dengan kenaikan beban sloshing pada dinding tangki tank wall pada kondisi filling level 10%,
50% dan 90% yaitu sebesar 80.12007 [Pa], 162.1433 [Pa], dan 240.1272 [Pa].
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Sloshing are displacement of fluid due to tank excitation by external force influenced by free
surface of the tank. Based on the IGC Code, one of the parameters considered on structure
analysis of ship liquid gases cargo tank are determined by sloshing loads. This analysis aims
to determine the amount of pressure (static, dynamic and total) which can occured in the
independent self supporting bilobe tank, that caused by Sway, Heave, and Roll of ship motion
at Bontang - Samarinda. Tank modeller are applied in 2D according to the geometry of the
tank, with half width is 6.65 m and 6.9 m of height using GAMBIT. Filling level at 10%, 50%,
and 90% are used as variations on FLUENT simulations. Sloshing effect’s on that observed
tank based on combination of sway, heave and roll spectra respons with maximum value are
0.763 [m2(rad/s)], 1.005 [m2(rad/s)], and 20.197 [deg2(rad/s)] on 0.8 – 1.2 [rad/s] range of
frequency. That’s caused significant increasing sloshing loads on longitudinal bulkhead for
50% filling level’s condition with 6.89% or 253.8503 [Pa] of the total pressure on same
boundary condition and filling level, that is 3684.823 [Pa]. That value’s more than maximum
sloshing loads that occurred on longitudinal bulkhead at 90% filling level condition by 1.95%
of percentage or 319.2278 [Pa] of the total pressure at that condition, that is 16349.56 [Pa].
Even though, filling level variations that caused significant increasing effect on sloshing load
is occurred on longitudinal bulkhead by condition 10%, 50% and 90% there are 1.222938 [Pa],
253.8503 [Pa], dan 319.2278 [Pa]. That values are more increased significantly than sloshing
load on tank wall’s boundary condition by 80.12007 [Pa], 162.1433 [Pa], dan 240.1272 [Pa]
with 10%, 50% and 90% filling level condition
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSPe 620.106 4 Sha a |
| Uncontrolled Keywords: | Bilobe, Bontang – Samarinda, FLUENT, Heaving, LNG, Rolling, Sloshing, Spektra Respons , Swaying, 2D. |
| Subjects: | V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering |
| Divisions: | Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Tondo Indra Nyata |
| Date Deposited: | 20 Sep 2018 04:43 |
| Last Modified: | 20 Sep 2018 06:19 |
| URI: | http://repository.its.ac.id/id/eprint/59683 |
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