Simulation and Validation of UNDEX Phenomena Relating to Axisymmetric Structures

Numerical modelling of underwater explosion (UNDEX) loading using LS-DYNA was studied in free field conditions and in relation to an axisymmetric thin shell of revolution - an echinodome in a floating submerged and tethered configuration. The formulation utilised was multi-material arbitrary Lagrangian Eulerian. Based on preliminary modelling, backed by existing data, numerically reproducible experiments were designed for validation purposes. The mesh generation and experimental validation are described and compared.