LAUSR

Abstract The response of a submerged structure to an underwater explosion (UNDEX) involves complex interactions between the structure and surrounding fluid. This study describes a numerical modelling methodology for calculating the structural response of an internally stiffened submerged aluminum cylinder to a close-proximity UNDEX. The simulations account for the effects of both the shock wave and bubble jetting on the deformation of the cylinder. The accuracy of the simulations is demonstrated by comparison of calculated pressure, bubble motion, structural displacement and strain with experimental measurements. The simulated migration and jetting of the gas bubble agrees well with experimental observations. The magnitude of calculated strains is consistent with measurements and the calculated depth of permanent deformation in the shell plating is within 3% of the experimental value.