Fluids and Structures

Publications

Applications of ALE Analysis Approach to Underwater and Air Explosion Problems

Using LS‑DYNA’s ALE formulation, this work simulates TNT‑driven shock waves in water and air to study fluid–structure and fluid–air interactions under explosive loading. Validated against established shock‑hardening standards, the models accurately predict pressure pulses and structural responses, highlighting a cost‑effective, reliable alternative to traditional live‑fire testing.

Surface Ship Shock Modeling and Simulation: Extended Investigation

Philip E. Malone

This thesis surveys past NPS work on simulating ship responses to underwater explosions and validates simplified models before tackling full 3D analyses. It explores the minimum fluid domain needed to capture cavitation effects on hull dynamics and presents an updated finite‑element model for DDG 53. The goal is to help design safer, more resilient ships while potentially reducing the scope of live shock trials.

Underwater explosion testing of catamaran-likestructure vs. simulation

Jong Wan Park

This paper investigates the shock response of structures subjected to underwater explosions through both experimental testing and numerical simulations using the LS-DYNA code and ALE technique. It also assesses the feasibility of applying scaling laws to such tests, aiming to provide a viable alternative to full-scale experiments.

Fluid-Structure Interaction through a Non-Material Interface

This paper describes simulations of solid rocket motors that couple core fluid flow, propellant and case structural response, and combustion, using a predictor-corrector algorithm for fluid-structure interaction. It employs a partitioned approach with existing codes, giving special consideration to jump conditions at the fluid-structure-combustion interface, and demonstrates its capability through a large-scale simulation.

Shock Trial Simulation for Naval Ships

This paper discusses the necessity of ship shock trial simulations for naval surface combatants to assess vulnerability to underwater explosions, highlighting the limitations of traditional physical trials due to cost, safety, and environmental concerns. It advocates for a new approach to shock qualification, moving beyond the diminishing returns of past full-scale tests.