Numerical Assessment of a Small-Scale Explosion Test Using CFD Technology
M. L. Costa Neto1, G. N. Doz2
1Faculty of Exact and Technological Sciences, State University of Mato Grosso, Mato Grosso, Brazil
2Department of Civil and Environmental Engineering, University of Brasilia, Federal District, Brazil
Keywords: explosion, shock wave, TNT equivalent, CFD, Autodyn
Abstract
Due to the high risks associated with explosive experiments, modern research typically focuses on small-scale models that determine parameters such as pressure and momentum using the distance reduction principle. Due to the complexity of the physical picture of an explosion, numerical modeling in combination with experimental methods is becoming a reliable tool for studying the parameters of detonation and shock wave propagation. In this paper, a small-scale explosive experiment was calculated using CFD modeling, the effect of the computational grid size was studied, and the effectiveness of protective devices placed above the blast barrier was assessed. Additionally, the TNT equivalent was estimated and an approach to its determination based on the Chapman-Jouguet relations was proposed. The results show that the calculation accuracy can correlate with both the grid size and the reduced distance. Modeling of protective devices revealed their noticeable effect on the shock wave distribution in the air. The proposed method for estimating the TNT equivalent showed promising results for the studied explosives; However, further research is recommended to expand its scope of application, particularly for aluminized compounds and other types of explosives.
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