Numerical simulation of electric explosions of metal wires

• Main Authors: Oreshkin, V.I., Baksht, R.B., Labetsky, A.Yu, Ratakhin, N.A., Rousskikh, A.G., Shishlov, A.V., Levashov, P.R., Khishchenko, K.V., Glazyrin, I.V., Beilis, I.
• Format: Conference Proceeding
• Language: English
• Subjects: Corona; Dielectric liquids; Explosions; Lagrangian functions; Magnetohydrodynamics; Numerical simulation; Plasma applications; Plasma density; Plasma simulation; Wires
• ISSN: 0730-9244; 2576-7208
• DOI: 10.1109/PLASMA.2004.1339763

Summary form only given. The successful application of z-pinches as high-power X-ray sources has aroused interest in the study of electric explosion of wires, particularly in vacuum. A large body of experimental data suggests that the explosion of a wire in vacuum is accompanied by the formation of strata and low-density plasma corona surrounding a dense core. It seems likely that early in the explosion this low-density corona consists of a gaseous matter, which is initially sorbed by the wire surface, while later in the process it is formed by metal vapors. We have already simulated the explosion of wires in a liquid dielectric with the use of a 1D magnetohydrodynamic (MHD) code based on the Lagrangian approach, and the results obtained have shown a good agreement with experimental data. However, with this code it is fundamentally difficult to simulate the explosion of wires in vacuum, since the MHD equations are approximated on a grid associated with the mass coordinates of the fluid, thus making impossible a correct simulation of the processes involving very large density differences. In case of the electric explosions of wires in vacuum, the density of a liquid metal is several orders of magnitude higher than that of vapors surrounding it. Therefore, it would appear more reasonable to simulate the process by the particle-in-cell method (the PIC method), where the particles moving on a fixed computational grid (Eulerian grid) are taken to be Lagrangian components.