In the present work, numerical simulation of structural damage subjected to the near-field underwater explosion is carried out by coupling the SPH and RKPM. The fluid solver is established based on the compressible SPH method, while the dynamic response of the structure is calculated based on the RKPM shell formulation. Since large deformation with contact will occur in the underwater explosion problem, a contact detection algorithm for the RKPM shell formulation is proposed. The contact force is calculated based on the volume strain. The fluid-structure interaction solver is established by adopting the normal-flux method, in which the structure is treated as a moving solid boundary for the fluid domain, while the fluid pressure is considered as the load act on the structure surface. Thus, the numerical model for the simulation of structural damage analysis in the underwater explosion is obtained, which is a part of the FSLAB software developed by the FSI laboratory of Harbin Engineering University. Finally, several numerical examples are studied to verify the robustness and accuracy of the present numerical model.

在目前的工作中，通过耦合SPH和RKPM进行了近场水下爆炸对结构破坏的数值模拟。基于可压缩的SPH方法建立了流体求解器，同时基于RKPM壳体公式计算了结构的动态响应。由于在水下爆炸问题中会发生接触变形大的问题，因此提出了一种针对RKPM壳体配方的接触检测算法。接触力基于体积应变计算。采用法线通量法建立了流固耦合求解器，将结构视为流体域的移动固体边界，而将流体压力视为作用在结构表面的载荷。从而，获得了用于水下爆炸结构损伤分析模拟的数值模型，该模型是哈尔滨工程大学FSI实验室开发的FSLAB软件的一部分。最后，研究了几个数值示例，以验证当前数值模型的鲁棒性和准确性。