Numerical simulation of long-duration blast wave evolution in confined facilities

The objective of this research effort is to investigate the quasi-steady flow field produced by explosives in confined facilities. In this effort we modeled tests in which HE cylindrical charge were hung in the center of a room and detonated. The HE used for the test were C-4 and AFX 757. While C-4 is just slightly underoxidized and is typically modeled as an ideal explosive, AFX 757 includes a significant percentage of aluminum particles, whole long-time afterburning and energy release must be considered. The LLNL-produced thermo-chemical equilibrium algorithm, “Cheetah”, was used to estimate the remaining burnable detonation products. From these remaining species, the afterburning energy was computed and added to the flow field. Computations of the detonation and afterburn of two HE in the confined multi-room facility were performed. The results demonstrate excellent agreement with available experimental data in terms of blast wave time of arrival, peak shock amplitude, reverberation and total impulse (and hence, total energy release, via either the detonation or afterburn processes.

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