Journal
JOURNAL OF MARINE SCIENCE AND ENGINEERING
Volume 10, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/jmse10020254
Keywords
sloshing; pendulum oscillation; rectangular tank; CFD; NITA; VOF
Categories
Funding
- Malta Marittima and Transport Malta via the `DeSloSH' project supported through the Maritime Seed Award 2020
- European Union's Horizon 2020 research and innovation programme, VENTuRE [856887]
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Conventional LNG cargo vessels face tank-fill limitations which restrict commercial operations. This study uses computational fluid dynamics to analyze the sloshing dynamics of partially-filled chamfered rectangular tanks. The findings show that the use of partition barriers reduces impact in a specific fill-range.
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.
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