A numerical analysis of dynamic slosh dampening utilising perforated partitions in partially-filled rectangular tanks

Borg, Mitchell G. and DeMarco Muscat-Fenech, Claire and Tezdogan, Tahsin and Sant, Tonio and Mizzi, Simon and Demirel, Yigit Kemal (2022) A numerical analysis of dynamic slosh dampening utilising perforated partitions in partially-filled rectangular tanks. Journal of Marine Science and Engineering, 10 (2). 254. ISSN 2077-1312 (https://doi.org/10.3390/jmse10020254)

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Abstract

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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