a b s t r a c tShaped charge, as a frequently used form of explosive charge for military and industrial applications, can produce powerful metal jet and lead to stronger penetration effects onto targets than normal charges. After the explosion of high explosive (HE) charge, the detonation produced explosive gas can exert tremendous pressure on surrounding metal case and liner with very large deformation and even quick phase-transition. In this paper, the entire process of HE detonation and explosion, explosion-driven metal deformation and jet formation as well as the penetrating effects is modeled using a smoothed particle hydrodynamics (SPH) method. SPH is a Lagrangian, meshfree particle method, and has been widely applied to different areas in engineering and science. A modified scheme for approximating kernel gradient (kernel gradient correction, or KGC) has been used in the SPH simulation to achieve better accuracy and stability. The modified SPH method is first validated with the simulation of a benchmark problem of a TNT slab detonation, which shows accurate pressure profiles. It is then applied to simulating two different computational models of shaped-charge jet with or without charge cases. It is found that for these two models there is no significant discrepancy for the length and velocity of the jet, while the shapes of the jet tip are different. The modified SPH method is also used to investigate the penetrating effects on a steel target plate induced by a linear shaped charge jet. The effectiveness of the SPH model is demonstrated by the good agreement of the computational results with experimental observations and the good energy conservation during the entire process.
SUMMARYThis paper presents a computational model for free surface flows interacting with moving rigid bodies. The model is based on the SPH method, which is a popular meshfree, Lagrangian particle method and can naturally treat large flow deformation and moving features without any interface/surface capture or tracking algorithm. Fluid particles are used to model the free surface flows which are governed by Navier-Stokes equations, and solid particles are used to model the dynamic movement (translation and rotation) of moving rigid objects. The interaction of the neighboring fluid and solid particles renders the fluid-solid interaction and the non-slip solid boundary conditions. The SPH method is improved with corrections on the SPH kernel and kernel gradients, enhancement of solid boundary condition, and implementation of Reynoldsaveraged Navier-Stokes turbulence model. Three numerical examples including the water exit of a cylinder, the sinking of a submerged cylinder and the complicated motion of an elliptical cylinder near free surface are provided. The obtained numerical results show good agreement with results from other sources and clearly demonstrate the effectiveness of the presented meshfree particle model in modeling free surface flows with moving objects.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.