Comparison and Validation of Smooth Particle Hydrodynamics (SPH) and Coupled Euler Lagrange (CEL) Techniques for Modeling Hydrodynamic Ram

Abstract

‡This paper presents (1) an overview and brief history of the evolution of computational techniques to predict structural damage resulting from hydrodynamic ram (HRAM), (2) a brief description of the smoothed particle hydrodynamics (SPH) technique, (3) a brief description of the Coupled Euler Lagrange (CEL) technique, (4) a description of a test fixture and program to examine the HRAM loads generated by a 12.7mm projectile entering a water-filled container, (5) applications and comparisons of SPH and CEL techniques for modeling fluid structure interactions, and comparisons with experimental data. The authors have exploited the capabilities of the LS-DYNA® code to model HRAM effects. This paper will present comparisons of the simulation techniques with experimental data in terms of pressure-time histories, velocity degradation of the projectile, as well as high speed photography of the actual events.