Simplified impinging jet model for practical sloshing assessment of lng cargo containment

초록

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. Copyright © 2012 by the International Society of Offshore and Polar Engineers (ISOPE).