Numerical investigation on global responses of surface ship subjected to underwater explosion in waves
Numerical investigation on global responses of surface ship subjected to underwater explosion in waves
复制标题
水面舰艇在波浪中水下爆炸作用下整体响应的数值研究
DOI：
10.1016/j.oceaneng.2018.05.013
复制
发表时间：
2018
影响因子：
5
通讯作者：
Wang S P
中科院分区：
文献类型：
--
作者：
Liu Y L;Zhang A M;Tian Z L;Wang S P
瞬变流固耦合问题一直是船舶力学中具有挑战性的问题。水下爆炸及其对附近建筑物的高度非线性影响更为复杂。本文对水面舰船在波浪中水下爆炸作用下的整体响应进行了数值研究，考虑了流体与结构之间的非线性耦合。采用边界元方法(BEM)模拟流场，采用势能分解理论考虑表面波的影响。采用振型叠加法模拟船体结构的整体响应。然后利用加速度势的模式分解方法建立了考虑相互作用的FSI模型。通过水下爆炸实验对数值模型进行了验证，数值计算结果与实验结果吻合较好。利用该模型，模拟了舰船与水下爆炸气泡在静水和波浪中的相互作用。分析了船舶整体响应的动力学特性和波浪的影响，发现了值得注意的非线性。
Transient fluid-structure interaction (FSI) has always been a challenging problem in ship mechanics. Underwater explosion and its highly nonlinear impact on nearby structures are more complicated. In this paper, the global responses of a surface ship subjected to an underwater explosion in waves are numerically investigated considering the nonlinear coupling between the fluid and structure solvers. The fluid field is modeled with the boundary element method (BEM), while the potential decomposition theory is adopted to take the surface waves into account. The global responses of the ship structure are modeled with the mode superposition method. Then a FSI model is established using the mode decomposition method of the acceleration potential to consider the interaction. An underwater explosion experiment is carried out to validate the numerical model, which shows good agreement between the numerical and experimental results. With the presented model, the interactions between a ship and an underwater explosion bubble both in still water and waves are simulated. The dynamics of the ship global responses and the influence of the waves are analyzed which shows noteworthy nonlinearity.