A Numerical Analysis of Dynamic Slosh Dampening Utilising Perforated Partitions in Partially-Filled Rectangular Tanks

Conventional liquefied natural gas (LNG) cargo vessels are imposed with tank-fill limitations as precautions to prevent structural damage and stability-loss due to high-impact sloshing, enforcing cargo volume-fills to be lower than 10% or higher than 70% of the tank height. The restrictions, however...

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Bibliographic Details
Published inJournal of marine science and engineering Vol. 10; no. 2; p. 254
Main Authors Borg, Mitchell G., DeMarco Muscat-Fenech, Claire, Tezdogan, Tahsin, Sant, Tonio, Mizzi, Simon, Demirel, Yigit Kemal
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.02.2022
Subjects
Cargo
Cargo capacity
Cargo handling
Cargo ships
CFD
Chamfering
Computer applications
Damage prevention
Fluid dynamics
Fluid mechanics
Fluid-structure interaction
Impact damage
Iterative methods
Kinetics
Liquefied natural gas
Natural gas
NITA
Numerical analysis
Offshore
pendulum oscillation
Porosity
rectangular tank
Reynolds number
Shipping
Slamming
sloshing
Static pressure
Structural damage
Structural stability
Tanks
Torque
Unloading
VOF
Wave dynamics
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Summary:Conventional liquefied natural gas (LNG) cargo vessels are imposed with tank-fill limitations as precautions to prevent structural damage and stability-loss due to high-impact sloshing, enforcing cargo volume-fills to be lower than 10% or higher than 70% of the tank height. The restrictions, however, limit commercial operations, specifically when handling spot trades and offshore loading/unloading at multiple ports along a shipping route. The study puts forward a computational fluid dynamic (CFD) sloshing analysis of partially-filled chamfered rectangular tanks undergoing sinusoidal oscillatory kinetics with the use of the explicit volume-of-fluid and non-iterative time-advancement schemes. Establishing a 20% to 60% fill-range, the sloshing dynamics were acknowledged within an open-bore, partitioned, and perforated-partitioned tank when oscillating at frequencies of 0.5 Hz and 1 Hz. The overall torque and static pressure induced on the tank walls were investigated. High-impact slamming at the tank roof occurred at 40% and 60% fills, however, the implementation of the partition and perforated-partition barriers successfully reduced the impact due to suppression and dissipation of the wave dynamics.
ISSN:2077-1312
2077-1312
DOI:10.3390/jmse10020254