Experimental and numerical investigation on the dynamic response of a simplified open floating slender structure subjected to underwater explosion bubble

A simplified open floating slender structure is used to investigate the dynamic behaviors of the warship in this paper. The deformation and damage mechanisms of the simplified open floating slender structure subjected to the underwater explosion are studied using the experiment and the Coupled Eulerian-Lagrangian (CEL) method. Firstly, a validation for the CEL method is carried out, where the numerical results agree well with the results in experiment. Subsequently, in order to analyze the deformation and damage characteristics of the simplified open floating slender structure subjected to the underwater explosion, a series of cases for different detonation distances and different charge weights are carried out. In the cases, the results indicate that the deformation and damage of the simplified open floating slender structure are mainly induced by the bubble, and the damage induced by the shock wave is not obvious. For small charge weight and large detonation distance, the whipping motion is the main deformation form of the simplified open floating slender structure. When the charge weight increases or the detonation distance decreases to a critical value, the simplified floating slender structure is damaged in a longitudinal bending mode with a plastic hinge generated in the middle region.