ABSTRACT:

Sloshing impact has been identified as a significant factor in the safety of LNG (liquefied natural gas) cargo transportation. In terms of practical design procedures for LNG cargo containment, it is difficult to evaluate sloshing impact and structural response in realistic way because of the complexity of sloshing phenomena, which is a type of fluid-structure interaction. A simplified numerical model is conducted to create an assessment procedure for sloshing impact in partially-filled LNG cargo tanks. A computational procedure based on an impinging jet of LNG acting on an insulation panel is employed in order to evaluate the sloshing impact on a real cargo tank. The velocity of the impinging jet is determined by a similarity rule that scales up the impact velocity from a small scale to that of actual scale. Several procedural components are introduced for a structural response calculation based on transient pressure. The transient pressure is associated with the model test, computational model of sloshing motion and the impact velocity of both model and real scale. The results of proposed procedure are evaluated by comparison with ship yard practice for membrane containment that.

INTRODUCTION

In the design of LNG (liquefied natural gas) CCS (cargo containment systems), it is very difficult to accurately determine the effects of sloshing impact and the corresponding response of the cargo containment structure. Based on many studies of the sloshing pressure and corresponding structural behavior, the peak sloshing impact pressure is one of the most important parameters to be assessed during the design of new LNG cargo containment systems (Kim et al., 2010). Over the past four decades, although the technical and practical approaches to evaluate structural behavior have improved, it is very difficult to accurately determine sloshing impact and the corresponding response of the cargo containment structure.

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