3-D unstructured adaptive supercomputing for transient problems of volcanic blast waves

1998 ◽  
Author(s):  
P. Voinovich ◽  
E. Timofeev ◽  
K. Takayama ◽  
T. Saito ◽  
A. Galyukov
Keyword(s):  
Blast Waves ◽  
Transient Problems

scholarly journals Radiation-Driven Stellar Eruptions

Galaxies ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 10 ◽  
Author(s):  
Kris Davidson
Keyword(s):  
Mass Loss ◽  
Radiation Pressure ◽  
Central Region ◽  
Massive Stars ◽  
Variable Stars ◽  
Blast Waves ◽  
Subsequent Evolution ◽  
Fundamental Causes ◽  
Radiative Output ◽  
Luminous Blue Variable

Very massive stars occasionally expel material in colossal eruptions, driven by continuum radiation pressure rather than blast waves. Some of them rival supernovae in total radiative output, and the mass loss is crucial for subsequent evolution. Some are supernova impostors, including SN precursor outbursts, while others are true SN events shrouded by material that was ejected earlier. Luminous Blue Variable stars (LBV’s) are traditionally cited in relation with giant eruptions, though this connection is not well established. After four decades of research, the fundamental causes of giant eruptions and LBV events remain elusive. This review outlines the basic relevant physics, with a brief summary of essential observational facts. Reasons are described for the spectrum and emergent radiation temperature of an opaque outflow. Proposed mechanisms are noted for instabilities in the star’s photosphere, in its iron opacity peak zones, and in its central region. Various remarks and conjectures are mentioned, some of them relatively unfamiliar in the published literature.

Mitigation of exploding-wire-generated blast-waves by aqueous foam

2015 ◽  
Vol 27 (7) ◽  
pp. 076103 ◽  
Author(s):  
M. Liverts ◽  
O. Ram ◽  
O. Sadot ◽  
N. Apazidis ◽  
G. Ben-Dor
Keyword(s):  
Blast Waves ◽  
Exploding Wire ◽  
Aqueous Foam

scholarly journals Determination of the average ionization and thermodynamic regimes of xenon plasmas with an application to the characterization of blast waves launched in xenon clusters

2011 ◽  
Vol 7 (2) ◽  
pp. 71-76 ◽  
Author(s):  
R. Rodriguez ◽  
J.M. Gil ◽  
R. Florido ◽  
J.G. Rubiano ◽  
M.A. Mendoza ◽  
...  
Keyword(s):  
Blast Waves ◽  
Xenon Clusters

scholarly journals Shock and blast waves mitigation

Shock Waves ◽  
2013 ◽  
Vol 23 (1) ◽  
pp. 1-4 ◽  
Author(s):  
A. Hadjadj ◽  
O. Sadot
Keyword(s):  
Blast Waves

Simulation of blast waves with tailored explosive charges

1985 ◽  
Vol 158 ◽  
pp. 137-152
Author(s):  
M. Sanai ◽  
H. E. Lindberg ◽  
J. D. Colton
Keyword(s):  
Shock Tube ◽  
Charge Density ◽  
Cost Effective ◽  
Development Programme ◽  
Blast Waves ◽  
Charge Density Distribution ◽  
Test Conditions ◽  
Order Of Magnitude ◽  
Explosive Charges ◽  
Simulation Time

We have developed a compact and cost-effective shock tube to simulate the static and dynamic pressures of blast waves. The shock tube is open at both ends and is driven by high explosives distributed over a finite length of the tube near one end. The overall charge length is determined by the simulation time of interest, and the charge-density distribution is tailored to produce the pressure-waveform shape desired. For the shock tube to simulate a typical blast wave, the charge density must be highest at the charge front (closest to the test section) and gradually reduced towards the back. The resulting shock tube is an order of magnitude shorter than a conventional dynamic airblast simulator (DABS) in which concentrated explosives are used to drive the shock.Tailored charges designed using this method were built and tested in a simulation development programme sponsored by the U.S. Defense Nuclear Agency (DNA). The pressures measured for several charge distributions agreed very well with SRI's PUFF hydrocode computations and demonstrated the feasibility of the compact simulator under realistic test conditions.

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