Numerical simulation of the multilayer coiled solenoid under implosive compression

In order to simulate the implosive compression process of a multilayer coiled solenoid and its associated interfacial instability by using the smooth particle hydrodynamics (SPH) solver, the AUTODYN user-defined subroutines have been employed to build a three dimensional solenoid model and achieve periodic boundary conditions. The simulated results show that the perturbation of the solenoid structure in the implosive compression process grows fast and then the interface becomes unstable at the end of compression, in agreement with the experimental results. The parameters of the solenoid structure significantly affect the development of the interfacial instability. The smaller the spiral angle, the larger the interfacial instability at the end of compression process, one the other hand, the smaller the wire diameter, the weaker the interfacial instability at the end of compression process.