Observation on sloshing flow and hydrodynamic pressures on cylindrical liquefied natural gas tank with swash bulkhead

Abstract

In this study, a series of sloshing model tests were conducted for type-C tanks, particularly to observe the effects of the inner bulkhead and rings. In regular pitch motion, the internal flow by swash bulkhead and rings located inside the tank was observed. The frequency range near the resonance frequency was checked at filling heights of 70%, and sloshing-induced impact pressures were investigated. Through this study, the global flows inside the tank and local flows during impact occurrence at the hemispherical end of the tank were systematically observed, and the impact pressure pattern for each frequency ratio was compared. Due to the swash bulkhead located in the center of the tank, the flow does not move at once and the velocity of the flow is reduced by the inner rings. The flows passing through the swash bulkhead proceed with a time difference, overlapping with the first wave, generating various types of sloshing impact. The results of computational fluid dynamics calculation and the experiment were also compared for limited conditions.

Research on wave suppression mechanism of porous baffle based on vortex dynamics

“…This kind of complex interfacial flow phenomenon is widely present in numerous engineering containers, such as those for liquefied natural gas (LNG), floating production storage and offloading (FPSO), tuned liquid damper (TLD) and fuel tanks of spacecraft and automobiles. [1][2][3][4][5][6][7] The local transient high pressure caused by violent sloshing may damage the tank's structure and even affect the attitude stability of the vehicle, especially under resonance conditions. 8 Adding a baffle to the tank using the damping effect of the baffle to generate a vortex can effectively suppress violent sloshing 9 and enhance the structural strength of the tank itself.…”

Outlier analysis of sloshing impact loads on liquid ship cargo

“…Numerous studies to investigate the sloshing phenomenon have been continuously conducted based on numerical, [1][2][3] and experimental methods. [4][5][6] Recently, there is also an attempt to identify the risk of sloshing by applying big data-based machine learning techniques. 7 Although the recent development of computational techniques for violent fluid flows, model-scale experiments are generally accepted as the most reliable method to understand the phenomenon of sloshing within a liquid cargo and to predict the sloshing-induced impact loads than analytical or computational methods.…”

Wave impact on a rigid and flexible wall using various viscous fluids during sloshing

“…Ding et al 22 investigated the liquid sloshing effect on LNG tanks under ice-breaking loads. Lee et al 23 investigated the sloshing effect on type-C tanks with internal structural members. Korkmaz and Güzel 24 studied sloshing mitigation using perforated baffles in rectangular tanks.…”