Research On The Detonation Simulation Using SPH Method

As the background of underwater explosion of warships, the detonation process of high explosive, which is difficult to simulate using the conventional grid-based numerical methods, is investigated in this paper. High explosive is provided with extremely dynamic characteristics with large deformations and large inhomogeneities in the extreme transient of explosion process. While, the smoothed particle hydrodynamics (SPH) method, suitable for solving hydrodynamics problems, is a numerical simulation method with adaptive, meshfree, particle and Lagrangian nature. It avoids mesh deformation and is very suitable for treating problems with large deformations and the impact loads. All of these characteristics lay the foundation for simulating the detonation process of high explosive.The problems of one-dimensional detonation process of high explosive are usually used for the benchmark test problems in measuring the numerical simulation methods used for the explosion process of high explosive. In the numerical simulation of the detonation process, the studies of applying appropriate numerical methods and computing codes to calculate the complicated fluid dynamics equations of detonation process are always concerned in the detonation theory and engineering research. The discrete Euler equations with artificial viscosity based on SPH method are applied to simulate the detonation process of both a half-infinite charge with end-ignition and a finite charge with mid-ignition of high explosive. From these two typical detonation examples, SPH method can predict the key characteristics of the detonation process of high explosive, and the numerical simulation results are compared with the theoretical solutions and experimental C-J results. The simulation results show that the SPH method can give a very good prediction of the pressure, energy, density and velocity distributions in the detonation process, and all the physical variables have reached superior precision, which is validated the correctness of simulating the detonation process of high explosive using SPH method.The real explosion model in this paper is compared with the artificial explosion model, which is usually used for underwater explosion simulation in the early period, and these two models are discussed and analyzed in detail. Finally, the SPH method is successfully applied to the initial detonation process with complicated EOS equation of high explosive in underwater explosion, and a new meshless method and research foundation is provided for underwater explosion in this paper.