Abstract:
"Applications of Arbitrary LaGrangian Eulerian (ALE) Analysis Approach to Underwater and Air Explosion Problems"
This paper presents a comprehensive investigation of underwater (UNDEX) and air (AIREX) explosion phenomena using the Arbitrary Lagrangian–Eulerian (ALE) numerical technique within LS‑DYNA. Three‑dimensional TNT detonations in a water medium and two‑dimensional TNT blasts in air were modeled to evaluate explosive–fluid, fluid–structure, and fluid–air interactions, as well as shock‑wave propagation through complex media. The study examines charge modeling effects, structural response of finite‑element models, and the influence of varying cylindrical surface thicknesses on blast loading. Results demonstrate that ALE‑based hydrocodes can accurately capture transient pressure fields and structural responses, offering a validated, high‑fidelity alternative to costly live‑fire tests. The findings underscore the potential of ALE simulations to streamline shock‑hardening design processes for naval and vehicular systems, improve combat survivability assessments, and reduce dependency on environmental and logistical constraints inherent to physical trials.
