Strength Assessment of LNG CCS under Sloshing Load Based on Fluid Structure Interaction Analysis

초록

The strength assessment against sloshing loading in LNG (liquefied natural gas) cargo tanks is important for the structural design of membrane LNG CCS (cargo containment system). The structural response of the insulation structure is crucial for the strength assessment of sloshing in LNG CCS. In practical design procedures for LNG CCS, the structural response due to sloshing load is not still clear, in spite of all the recent research in the industry. 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. In this study, a simplified numerical model is conducted to create a strength assessment procedure for LNG CCS. The computational procedure based on a localized zooming technique in order to evaluate the sloshing impact on a real cargo tank. The fluid velocity of the localized model is determined by the rule that scales up the impact velocity from a small scale to actual scale. The results of proposed method are evaluated by comparison with practical assessment results.