Mark Ⅲ型LNG船围护系统，其结构是支撑液舱及隔绝环境与液舱温度交换的主体结构，因此其结构安全是最为关键的问题之一。本文流场采用CFD法、结构场采用有限元法构建流固耦合数值计算模型，研究流固耦合效应对砰击载荷的时空分布特性影响，以及结构的可能失效模式。研究结果表明，在波纹节中间位置且迎浪方向的平区附近，刚性与弹性围护系统的砰击载荷均有明显的冲击特征，受流固耦合效应影响，弹性围护系统对应的砰击载荷轮廓中存在较多波动的次峰；在给定波浪条件下，水槽内的冲击压力达到最大时，弹性围护系统结构的主要变形发生在顶层合板及首层聚氨酯泡沫隔热层上，而最大应力响应发生在靠近波纹节附近。
The structure of Mark III LNG carrier containment system is the main structure to support the liquid tank and isolate the temperature exchange between the environment and the liquid tank, so its structural safety is one of the most critical issues. In this paper, the flow field and the structural field adopt CFD method and finite element method to construct the fluid-solid coupling numerical calculation model, respectively. The influence of fluid-solid coupling effect on the spatial and temporal distribution characteristics of slamming load and the possible failure mode of the structure are studied. The results show that the slamming loads of the rigid and elastic containment systems have obvious impact characteristics near the flat area in the middle of the corrugated joint and the wave direction. Affected by the fluid-solid coupling effect, there are many secondary peaks in the slamming load profile corresponding to the elastic containment system. Under the given wave conditions, when the impact pressure in the tank reaches the maximum, the main deformation of the elastic containment system structure occurs on the top plate and the first layer of polyurethane foam insulation layer, and the maximum stress response occurs near the corrugated section.
2025,47(13): 25-31 收稿日期：2024-10-16
DOI：10.3404/j.issn.1672-7649.2025.13.005
分类号：U661.1
基金项目：江苏海洋大学科研启动基金项目（KQ19045）
作者简介：丁雨涵(2000-),女,硕士研究生,研究方向为船舶流体力学
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