Development of an In house Computer Code for the Simulation of Detonation Shock Dynamics in Underwater Explosion Scenario

P Chellapandi; C Lakshmana Rao

doi:10.14429/dsj.72.17833

P Chellapandi Indian Institute of Technology, Madras, Chennai - 600 036, India https://orcid.org/0000-0002-1419-1480
C Lakshmana Rao Indian Institute of Technology, Madras, Chennai - 600 036, India http://orcid.org/0000-0003-2526-7775

DOI: https://doi.org/10.14429/dsj.72.17833

Keywords: Numerical simulation, Underwater explosion, Detonation shock dynamics, CJ theory, Burn fraction model, Energy distributions, Work potential of explosive

Abstract

Detonation Shock Dynamics (DSD), involved in an underwater explosion scenario is numerically simulated by an in-house computer code, ‘DSSDYN’. The simulation is based on Chapman-Jouguet (CJ) theory, formulated in Arbitrary Lagrangian Eulerian frame work. Specifically, the propagation of detonation front is simulated with‘Burn Fraction Model’. The classical burn fraction model is improved for achieving better computational efficiency. The simulation capability of DSS-DYN is demonstrated through a case study on explosion of PETN charge under the deep-water medium.Through this study, the salient features of DSD with better insight have been brought out. Besides, the physical parameters, such as work potential of PETN, are predicted efficiently.The apportionment of energy distributions indicates that about 70 % of chemical energy of explosive is transmitted to the surrounding water that is the major contribution of damage potential of the explosive. The predictions of peak velocity and peak pressure values by DSS-DYN and LS-DYNA show satisfactory comparison.DSS-DYN consumes lesser computational time (~1h), compared to LS-DYNA (~3h).