Two-dimensional numerical simulation of the factors influencing the explosion overpressure load inside the confined space

[Objectives] In order to study how dynamic motion of explosive, initial interface disturbance and grid size affect the overpressure load of internal explosion,[Methods] the spatial and temporal terms of the two-dimensional compressible Euler equations are discretized numerically using the fifth-order WNEO finite difference scheme and the third-order TVD Runge-Kutta scheme. Based on Fortran platform, an in-house high-precision numerical calculation program of blast wave in confined space was developed. The impacts of the overpressure load of the internal explosion were preliminarily discussed adopting the developed program.[Results] The results show that, increasing charge movement speed, selecting a specific interface disturbance and decreasing the size of the grid can significantly increase shock wave peaks of internal explosion, but has little effect on quasi-static overpressure load.[Conclusions] The research in this paper can provide certain reference and basis for the design of anti-explosion structure and the evaluation of internal explosion damage