Modeling Blast Waves

Needham, Charles E.

doi:10.1007/978-3-642-05288-0_20

Cited by 31 publications

(58 citation statements)

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“…A similar conclusion is reached for smaller angular scales (1−10 ) by the Plateau de Bure/Pico Veleta CO survey (Castro-Carrizo et al 2007, 2010. In addition, Mid-IR and optical surveys (Meixner et al 1999;Ueta et al 2000) have shown that the shells exhibit at least axisymmetry by the end of the AGB phase.…”

Section: Introductionmentioning

confidence: 53%

X Herculis and TX Piscium: two cases of ISM interaction with stellar winds observed byHerschel

Jorissen

Mayer

Eck

et al. 2011

A&A

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The asymptotic giant branch (AGB) stars X Her and TX Psc have been imaged at 70 and 160 μm with the PACS instrument onboard the Herschel satellite, as part of the large MESS (Mass loss of Evolved StarS) guaranteed time key program. The images reveal an axisymmetric extended structure with its axis oriented along the space motion of the stars. This extended structure is very likely to be shaped by the interaction of the wind ejected by the AGB star with the surrounding interstellar medium (ISM). As predicted by numerical simulations, the detailed structure of the wind-ISM interface depends upon the relative velocity between star+wind and the ISM, which is large for these two stars (108 and 55 km s −1 for X Her and TX Psc, respectively). In both cases, there is a compact blob upstream whose origin is not fully elucidated, but that could be the signature of some instability in the wind-ISM shock. Deconvolved images of X Her and TX Psc reveal several discrete structures along the outermost filaments, which could be Kelvin-Helmholtz vortices. Finally, TX Psc is surrounded by an almost circular ring (the signature of the termination shock?) that contrasts with the outer, more structured filaments. A similar inner circular structure seems to be present in X Her as well, albeit less clearly.

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Section: Introductionmentioning

confidence: 53%

X Herculis and TX Piscium: two cases of ISM interaction with stellar winds observed byHerschel

Jorissen

Mayer

Eck

et al. 2011

A&A

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“…3(a), with the 50-nm commercial aluminumnanoparticle samples exhibiting the most rapid shock-wave expansion over the first 10 ls. Prior studies concerned with probing the shock-wave velocities associated with a variety of laser-initiated expansions, including ablation and plasmaforming processes, 20,[26][27][28] have used classical Taylor-Sedov (T-S) blast-wave theory [29][30][31] or modified variations thereof that account for drag forces associated with the surrounding medium. 26,27 Classical T-S theory assumes that an initial instantaneous input of energy produces a shock wave that is emitted from a point source, which results in a simple expression for the time (t) dependence of the expanding shock-front radius, r, as follows:…”

Section: A Temporally Resolved Shadowgraphy Of Shock Propagationmentioning

confidence: 99%

Spatially and temporally resolved temperature and shock-speed measurements behind a laser-induced blast wave of energetic nanoparticles

Roy

Jiang

Stauffer

et al. 2013

Journal of Applied Physics

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Spatially and temporally resolved temperature measurements behind an expanding blast wave are made using picosecond (ps) N2 coherent anti-Stokes Raman scattering (CARS) following laser flash heating of mixtures containing aluminum nanoparticles embedded in ammonium-nitrate oxidant. Production-front ps-CARS temperatures as high as 3600 ± 180 K-obtained for 50-nm-diameter commercially produced aluminumnanoparticle samples-are observed. Time-resolved shadowgraph images of the evolving blast waves are also obtained to determine the shock-wave position and corresponding velocity. These results are compared with near-field blast-wave theory to extract relative rates of energy release for various particle diameters and passivating-layer compositions.Keywords aluminum nanoparticles, coherent anti-Stokes Raman scattering, energetic nanoparticles, energy release, laser flash-heating, particle diameters, relative rates, coherent scattering, Raman spectroscopy Disciplines Mechanical Engineering CommentsThe following article appeared in Journal of Applied Physics 113, 184310 (2013) Spatially and temporally resolved temperature and shock-speed measurements behind a laser-induced blast wave of energetic nanoparticles Spatially and temporally resolved temperature measurements behind an expanding blast wave are made using picosecond (ps) N 2 coherent anti-Stokes Raman scattering (CARS) following laser flash heating of mixtures containing aluminum nanoparticles embedded in ammonium-nitrate oxidant. Production-front ps-CARS temperatures as high as 3600 6 180 K-obtained for 50-nmdiameter commercially produced aluminum-nanoparticle samples-are observed. Time-resolved shadowgraph images of the evolving blast waves are also obtained to determine the shock-wave position and corresponding velocity. These results are compared with near-field blast-wave theory to extract relative rates of energy release for various particle diameters and passivating-layer compositions. V C 2013 AIP Publishing LLC.[http://dx

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“…The impactor is a solid body consisting of aluminum, the target asteroid is assumed to be granite composition, and the outside space is modeled as a low density air (setting zero density in a region for Eulerian methods produces infinity). The nuclear device is modeled as air and initialized as a point source in the domain as specified by Needam [88]. This still requires two distinct phases to model, air and the asteroid target (the NED can be modeled with the properties of air).…”

Section: Multiphase Modelingmentioning

confidence: 99%

“…An example blast wave is illustrated in Figure 5.4 [88], where if the target fragments at the peak value of the positive part (also called positive phase) the remainder of the positive part may not travel. At this peak point, the material is compressed, and waves should be allowed to propagate through this compressed region.…”

Section: Multiphase Damage Modelingmentioning

confidence: 99%

“…At this peak point, the material is compressed, and waves should be allowed to propagate through this compressed region. A unique property of blast waves and impacts is the appearance of negative parts, which occur when the shock front has traveled a certain distance and the pressure behind the front drops below that of the surrounding atmosphere or material [73,88,130]. Once this wave part arrives, the damaging wave front no longer effects the region.…”

Section: Multiphase Damage Modelingmentioning

confidence: 99%

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A GPU-accelerated high-order multiphase computational tool for asteroid fragmentation and pulverization modeling

Zimmerman¹

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Modeling Blast Waves

Cited by 31 publications

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X Herculis and TX Piscium: two cases of ISM interaction with stellar winds observed byHerschel

X Herculis and TX Piscium: two cases of ISM interaction with stellar winds observed byHerschel

Spatially and temporally resolved temperature and shock-speed measurements behind a laser-induced blast wave of energetic nanoparticles

A GPU-accelerated high-order multiphase computational tool for asteroid fragmentation and pulverization modeling

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