Reacting condensed phase explosives in direct contact
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Journal Title
Journal of Applied Physics
ISSN
0021-8979
Publisher
American Institute of Physics
Type
Article
This Version
AM
Metadata
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Demattè, R., Michael, L., & Nikiforakis, N. Reacting condensed phase explosives in direct contact. Journal of Applied Physics https://doi.org/10.17863/CAM.81544
Abstract
In this article we present a new formulation and an associated algorithm for the simultaneous numerical simulation of
multiple condensed phase explosives in direct contact with each other, which may also be confined by (or interacting
with one or more) compliant inert materials. Examples include composite rate-stick (i.e. involving two explosives
in contact) problems, interaction of shock waves with chemically-active particles in condensed-phase explosives and
devices such as detonators and boosters. There are several formulations which address the compliant or structural
response of confiners and particles due to detonations, but the direct interaction of explosives remains a challenge for
most formulations and algorithms. The proposed formulation addresses this problem by extending the conservation
laws and mixture rules of an existing hybrid formulation (suitable for solving problems involving the coexistence
of reactants and products in an explosive mixture and its immiscible interaction with inert materials) to model the
interaction of multiple explosive mixtures. An algorithm for the solution of the resulting system of partial differential
equations is presented, which includes a new robust method for the retrieval of the densities of the constituents of each
explosive mixture. This is achieved by means of a multi-dimensional root-finding algorithm which employs physical
as well as mathematical considerations in order to converge to the correct solution. The algorithm is implemented in
a hierarchical adaptive mesh refinement framework and validated against results from problems with known solutions.
Additional case studies demonstrate that the method can simulate the interaction of detonation waves produced by
military grade and commercial explosives in direct contact, each with its own distinct equation of state and reaction rate
law.
Sponsorship
Engineering and Physical Sciences Research Council (2277929)
Embargo Lift Date
2025-02-16
Identifiers
This record's DOI: https://doi.org/10.17863/CAM.81544
This record's URL: https://www.repository.cam.ac.uk/handle/1810/334134
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