Statistics – Computation
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...283..825i&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 283, Aug. 15, 1984, p. 825-832. Sponsorship: Ministry of Education, Science
Statistics
Computation
12
Interstellar Matter, Shock Waves, Supernova Remnants, Wave Scattering, Axisymmetric Flow, Computational Fluid Dynamics, Radial Flow, Spherical Waves
Scientific paper
A two-dimensional fluid-dynamical computer program is used to examine the acoustic pulses produced when a shock wave strikes a spherical cloud. It is found that the impact of a shock wave with incident shock Mach number between 1.6 and 2.4 on an interstellar cloud produces outward-moving acoustic waves as predicted theoretically. The total energy in such pulses is measured by a value of the wave efficiency factor somewhat greater than one, ranging from 2.4 for a cloud with an initial density 1000 times greater than that in the intercloud medium, down to 1.2 if this density ratio is 160. The length of the pressure pulses is generally at least 1.25 that of the initial cloud diameter, corresponding to a full wavelength of about 2.5 this diameter. Pressure oscillations of this wavelength will be only weakly absorbed in the hot intercloud medium, and will mostly be absorbed in the warm clouds.
Ikeuchi Satoru
Spitzer Lyman Jr.
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