Numerical study on the attenuation effect on the blast wave of encircling a high explosive with granular media

Sugiyama, Yoshinobu; Homae, Tomotaka; Matsumura, Tomoharu; Wakabayashi, Kunihiko

doi:10.1063/1.5143351

Cited by 6 publications

(10 citation statements)

References 34 publications

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“…This method was used by Sugiyama et al. (2020, 2021) and McGrath, Clair & Balachandar (2016). The drag factor is given as where and with defining the relative Reynolds number with air viscosity as …”

Section: Methodsmentioning

confidence: 99%

“…2018 a , b ; Sugiyama et al. 2020) to encircle the high explosive. These studies have confirmed significant reductions in the peak overpressure and positive impulse.…”

Section: Introductionmentioning

confidence: 99%

“…In the case of the particle layer encircling the high explosive, we computed the transferred energies caused by the drag and the heat transfer between the particles and the shocked air (Sugiyama et al. 2020). Increasing the amount of particles caused a larger transferred energy from the shocked air to the particles and further mitigated the blast wave, as shown by Pontalier et al.…”

Section: Introductionmentioning

confidence: 99%

“…2014; Sugiyama et al. 2020, 2021) and with a compressible foam and a weak shock wave (Baer 1992). This method is based on a seven-equation model (mass, momentum and energy of the two phases, and volume fraction of a phase when two materials only are considered).…”

Section: Introductionmentioning

confidence: 99%

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Numerical study on the interaction between a shock wave and porous foam and the mitigation mechanism of porous foam filling a straight tube on a blast wave

et al. 2022

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This study validated a two-phase compressible flow model considering elasto-plastic porous foams. The numerical data were compared with the previous experimental results in terms of the interaction between the planar shock wave and the porous foams and the mitigation effect of a porous foam filling a straight tube on a blast wave. The porous foams in the shock tube interacted with a planar shock wave. The drag between the shocked air and the foams reduced the shock wave strength. Moreover, the flexible foam was significantly deformed by the shock wave. The validation results confirmed good agreement and consistency between the numerical and experimental data. The mitigation effect on the blast wave caused by a high explosive, where the main parameter for comparison was the location of a rigid porous foam layer inside the straight tube, was investigated. In the first case, the porous foam plate was placed on the floor, whereas in the second case, the porous foam plates were placed on the floor, sidewalls and ceiling. The total energy transferred between the porous foam and the shocked air was computed to quantitatively understand the mitigation mechanism of the porous foam on the blast wave. The heat transfer was a dominant factor for the energy transfer from the shocked air to the porous foams. The second case further mitigated the blast wave outside, and the increment of the interface area of the air/porous foam greatly affected the blast wave mitigation.

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Section: Methodsmentioning

confidence: 99%

“…2018 a , b ; Sugiyama et al. 2020) to encircle the high explosive. These studies have confirmed significant reductions in the peak overpressure and positive impulse.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical study on the interaction between a shock wave and porous foam and the mitigation mechanism of porous foam filling a straight tube on a blast wave

et al. 2022

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“…The use of reactive particles to enhance explosive blasts, increase quasistatic overpressure, and produce extended energy release through afterburning processes is an active research topic [1][2][3][4][5][6][7][8][9][10][11]. The detonation of a condensed phase explosive, which may contain energetic particles, is a precursor event to particle dispersal, turbulent mixing, and afterburning processes [12].…”

Section: Introductionmentioning

confidence: 99%

A simplified burn model for simulating explosive effects and afterburning

Houim

2021

Shock Waves

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A simplified burn model (SBM) was developed for use in simulating the effects of explosive detonations. The goal of SBM is to provide a subgrid model for detonation propagation on grids that are many times coarser than the physical width of the reaction zone. Similar to traditional programmed burn (PB), SBM provides accurate enough initial conditions for simulating largescale blasts and afterburning processes resulting from the detonation. The governing equations are based on the five-equation compressible multiphase flow model that describes reaction and post-detonation processes similar to reactive burn models. The model uses highly simplified reactant equations of state and reaction rate laws. The reaction model is based on burning rates from traditional PB approaches and is designed to spread the reaction zone over a small number of grid points regardless of the mesh resolution. The detonation velocity and state are independent of the input parameters for the reactant equation of state and reaction model, provided the inputs are physically realistic. The single input parameter for the equation of state must be selected such that the reactant and product Hugoniot curves do not cross, otherwise unphysical weak detonations result. Numerical experiments show that the velocity, state, and bulk structure of Chapman-Jouguet detonations can be reproduced by the model. The resulting blast profiles, pressure-time traces, and detonation velocity for multidimensional simulations are relatively independent on the input parameters, again, provided the inputs are physically reasonable. The simplified burn model shows great potential for simulating afterburning processes with detailed reaction models or explosive particle dispersal. The SBM is relatively straightforward to implement in compressible multiphase flow codes.

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