Numerical simulation of structural damage subjected to the near-field underwater explosion based on SPH and RKPM

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 F SI laboratory of Harbin Engineering University. Finally, several numerical examples are studied to verify the robustness and accuracy of the present numerical model.