Numerical study of blast characteristics from detonation of homogeneous explosives

Balakrishnan, Kaushik; Génin, Franklin; Nance, Doug V.; Menon, Suresh

doi:10.1007/s00193-009-0236-4

Cited by 42 publications

(52 citation statements)

References 25 publications

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“…The afterburning effect in a blast simulation is a time-delayed release of energy that corresponds to a secondary shock. The afterburning effect may increase the total impulse exerted on the target structure rather than increasing the peak overpressure [23,24]. Therefore, the exclusion of the afterburning effect may lead to an underestimation of the total impulse in the blast simulation.…”

Section: High Explosivementioning

confidence: 99%

Numerical simulation of armored vehicles subjected to undercarriage landmine blasts

Erdik¹,

Kiliç

Kılıç³

et al. 2015

Shock Waves

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Landmine threats play a crucial role in the design of armored personnel carriers. Therefore, a reliable blast simulation methodology is valuable to the vehicle design development process. The first part of this study presents a parametric approach for the quantification of the important factors such as the incident overpressure, the reflected overpressure, the incident impulse, and the reflected impulse for the blast simulations that employ the Arbitrary LagrangianEulerian formulation. The effects of mesh resolution, mesh topology, and fluid-structure interaction (FSI) parameters are discussed. The simulation results are compared with the calculations of the more established CONventional WEaPons (CONWEP) approach based on the available experimental data. The initial findings show that the spherical topology provides advantages over the Cartesian mesh domains. Furthermore, the FSI parameters play an important role when coarse Lagrangian finite elements are coupled with fine Eulerian elements at the interface. The optimum mesh topology and the mesh resolution of the parametric study are then used in the landmine blast simulation. The second part of the study presents the experimental blast response of an armored vehicle subjected to a landmine explosion under the front left wheel in accordance with the NATO AEP-55 Standard. The results of the simulations show good agreement with the experimental measurements.

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Section: High Explosivementioning

confidence: 99%

Numerical simulation of armored vehicles subjected to undercarriage landmine blasts

Erdik¹,

Kiliç

Kılıç³

et al. 2015

Shock Waves

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“…The initial detonated explosive charge is modeled using the Gas-Interpolated-Solid Stewart-Prasad-Asay (GISPA) method [4,22,26]. Numerical accuracy is needed to capture the primary blast wave, the secondary shock wave and the mixing zone.…”

Section: Post-detonation Flowsmentioning

confidence: 99%

“…The shock waves emanating from the center of the charge, henceforth called the origin, must retain their symmetry as is expected. We consider a 3D sector grid as used earlier for some of these studies [4,5]. A domain of length 2.4 m in radial (R) direction and 45 o in θ and Φ directions is considered.…”

Section: Post-detonation Flowsmentioning

confidence: 99%

“…A domain of length 2.4 m in radial (R) direction and 45 o in θ and Φ directions is considered. The radial extent of the domain is chosen based on the strength of the charge and past numerical simulations [4,5]. For a nitromethane (NM) charge of 11.8 cm diameter (considered in this paper), the maximum radial extent of 2.4 m is sufficient to study the blast wave propagation and the mixing layer characteristics.…”

Section: Post-detonation Flowsmentioning

confidence: 99%

“…Such explosives are primarily designed to enhance the afterburn in the post-detonation flow field. Past studies of afterburn [1,2,3,4,5] have attempted to quantify the evolution of the blast wave and the mixing zone behind it, but these studies are mostly limited to explosives with a low volume fraction of solid particles, i.e., < 0.01. However, experimental and realistic high energy heterogeneous explosives contain a large number of particles with the range of volume fraction of particles between 0.01 to 0.65.…”

Section: Introductionmentioning

confidence: 99%

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Turbulent mixing and afterburn in post-detonation flow with dense particle clouds

Gottiparthi¹,

Menon²

2017

AIP Conference Proceedings

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Abstract. Augmentation of the impact of an explosive is routinely achieved by packing metal particles in the explosive charge. When detonated, the particles in the charge are ejected and dispersed. The ejecta influences the post-detonation combustion processes that bolster the blast wave and determines the total impact of the explosive. While the classical Eulerian-Lagrangian (EL) methods can accurately handle the post-detonation mixing zone in the dilute regime, the Eulerian-Eulerian (EE) method is preferred for the initial dense clustering. Here, we summarize the results obtained using both EL and EE methods as well as demonstrate a new hybrid EE-EL approach. The EL method, which is also developed to handle both dense and dilute flows using the discrete equation method, is used initially to study the dispersion of a relatively dense particle shell by blast waves. The results show distinct clustering of particles that later leads to the formation of jet-like structures as seen in experiments. Then, the hybrid EE-EL method is used to study the dispersion of dense clouds from explosives packed with aluminum (reactive) or steel (inert) particles. A transitioning criterion is used to smoothly transfer the initially dense Eulerian mass to Lagrangian particles when dilute. Results are presented to demonstrate that the approach is computationally efficient and accurate for certain ranges of particle sizes and loading. It is shown that mixing between the ambient and post-detonation products can be enhanced when particles are present in the flow. Furthermore, the afterburn of aluminum particles increases in the average gas-phase temperature by 100 K -200 K when compared to a case with non-reacting particles. More studies are still needed to establish a robust strategy for wider applications.

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Simulation of impulse effects from explosive charges containing metal particles

2010

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Numerical study of blast characteristics from detonation of homogeneous explosives

Cited by 42 publications

References 25 publications

Numerical simulation of armored vehicles subjected to undercarriage landmine blasts

Numerical simulation of armored vehicles subjected to undercarriage landmine blasts

Turbulent mixing and afterburn in post-detonation flow with dense particle clouds

Simulation of impulse effects from explosive charges containing metal particles

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