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• W1616962015 abstract "Flowfields associated with one-dimensional free-air explosions are well known both for the point-source case and for the case of a blast wave driven by the detonation of a high-explosive (HE) charge. Considered here is the two-dimensional case of the reflection of a spherical, HEdriven blast wave from an ideal plane surface. The evolution of the flowfield was calculated with a nondiffusive numerical algorithm for accurately solving the Euler equations. This algorithm is based on a second-order Godunov scheme and a monotonicity algorithm that is designed to give sharp shocks and contact surfaces while smooth regions of the flow remain smooth yet free of numerical diffusion. The incident HE-driven blast wave was accurately captured by a fine-zoned one-dimensional calculation that was continuously fed into the two-dimensional mesh. The latter incorporated a fine-zoned mesh that followed the reflection region and accurately resolved the complicated flow structure occurring on multiple length scales. Major findings in the regular reflection region were as follows. Portions of the main reflected shock reflected within the channel formed by the wall and the dense HE products, thus creating additional pressure pulses on the wall. Coherent vortex structures formed on the fireball as a result of the interaction of the reflected shock with this contact surface. The flow did Presented at the 10th ICDERS, Berkeley, California, August 4-9, 1985. Copyright© American Institute of Aeronautics and Astronautics, Inc., 1985. All rights reserved. Mathematician, Mathematics Department. 'Mathematician, Applied Mathematics Branch. ^Senior Staff Scientist, Nuclear Effects Department. 388 MACH REFLECTION FROM AN HE-DRIVEN BLAST WAVE 389 indeed make a transition to a double-Mach structure, but this transition was delayed 1.5 to 3.8 deg beyond the twoshock limit of regular reflection because the nascent Mach stem was less than one cell high in this region. The double-Mach structure with its two moving stagnation points was similar (but not identical) to an equivalent shock-on-wedge case. A key feature of this flow was a supersonic wall jet (velocity of 3.5 to 4.3 km/s) consisting of a free shear layer and a wall boundary layer. The wall jet was laminar in these calculations, but should actually be turbulent due to Reynolds number considerations. Nevertheless, calculated peak pressures were found to be in excellent agreement with experimental data at all ground ranges." @default.
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• W1616962015 date "1986-01-01" @default.
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• W1616962015 title "Mach Reflection from an HE-Driven Blast Wave" @default.
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• W1616962015 doi "https://doi.org/10.2514/5.9781600865800.0388.0421" @default.
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