Analysis of influencing factors on numerical computation of underwater explosion of slender tapered charge

Abstract

Abstract To accurately calculate the shock-wave pressure curve of the underwater explosion of slender tapered charge, this research constructs a two-dimensional axisymmetric numerical model. In this foundation, this research further investigates the influence of the computational domain size, computational domain symmetry, gauge grid size, charge grid size, and biaxial grid uniformity on the shock-wave pressure curve. As a whole, this research reveals the following several findings. To begin with, increasing the size of the computational domain is helpful to weaken the curve oscillation, and so is maintaining the symmetry of the computational domain. Secondly, an excessive ratio of the number of two-dimensional grids, which is manifested by the non-uniformity of biaxial grids, leads to the grid being too slender at the boundary and the oscillation amplitude of the pressure curve increasing obviously. Furthermore, the gauge grid size exerts a notable influence on the peak pressure of the shock wave. Lastly, in the case of a fine grid covering the gauge, the charge grid size generates no obvious influence on the peak pressure.