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_ Herein, to predict the sloshing pressure for the No. 1 and No. 2 tanks of a liquefied natural gas carrier, a series of sloshing model tests were performed and the obtained results were analyzed. By statistically approaching the experimentally measured pressure, the differences by position in each tank were analyzed. At this time, the sloshing impact pressures caused by the ship motion in various irregular sea conditions were measured. The loading conditions were tested for the full-load conditions of 95%, 80%, 70%, and 10% load for the ballast condition based on the tank height. Among the sea state conditions, the representative angle of incidence, significant wave height, and periodic conditions were chosen and the results were summarized. Notably, the sloshing impact pressures generated in the No. 1 and No. 2 tanks of different shapes and positions can be compared by simultaneously installing the two tanks on the motion platform.
Introduction The sloshing phenomenon is a flow caused by the movement of the tank containing the fluid, which impacts the tank wall. Particularly, for a liquefied natural gas (LNG) carrier, studies on the sloshing phenomenon have been actively performed for the safety design of cargo holds because large amounts of LNG impact the tank wall due to the vessel movement. Since the sloshing phenomenon exhibits strong nonlinearity, experimental studies have been actively performed. Classification has also driven experimental analysis (American Bureau of Shipping, 2006; Bureau Veritas, 2011; Det Norske Veritas Germanischer Lloyd, 2014; Lloyd’s Register, 2009). Additionally, due to computer performance improvements, sloshing studies employing computational fluid dynamics (CFD) are gradually being conducted. For example, Liu and Lin (2008) developed a numerical model for the nonlinear sloshing flow in a three-dimensional rectangular tank. Yang et al. (2016) analyzed the velocity field and impact pressure by comparing the CFD and the particle image velocimetry results for a two-dimensional sloshing impact.