Mathematics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989stin...9016674k&link_type=abstract
Presented at the Centennial Meeting of the American Astronomical Society of the Pacific, Berkeley, CA, 21-23 Jun. 1989
Mathematics
Clouds, Interstellar Matter, Shock Wave Interaction, Supernova Remnants, Turbulence, Turbulent Flow, Density (Mass/Volume), Grid Generation (Mathematics), Hydrodynamics, Interstellar Magnetic Fields, Shock Waves, Vortex Rings
Scientific paper
Results are presented for the interaction of a supernovae remnant blast wave with a small interstellar cloud, using for the first time high resolution local adaptive mesh refinement techniques with an underlying second order accurate 2-D Godunov hydrodynamic scheme. The cloud shock is assumed to be strong enough that it is non-radiative. The morphological evolution of the cloud is followed in great detail as it undergoes a series of complex shock-shock interactions and Kelvin-Helmholtz and Rayleigh-Taylor instabilities. It is demonstrated over a large range of cloud densities and shock strengths, that clouds are efficiently destroyed in a few cloud crushing times (essentially, the Rayleigh Taylor time) by a combination of instabilities and large scale shear flow. The scaling properties of clouds of different densities and shocks of different strengths are investigated. The results have uncovered the development of copious supersonic vortex rings produced in the shear flow layer of the interaction. These vortex rings may wrap up ambient magnetic fields, enhancing the synchrotron emission and possibly explaining the compact radio hot spots seen in Cas A. Calculations have carried, for the first time, the cloud-shock interaction well into the fragmentation regime. It is demonstrated that similar calculations with standard fixed grid hydrodynamic schemes would require one to two orders of magnitude more computational time than is needed with the adaptive mesh approach to achieve comparable results.
Blitz Leo
Colella Philip
Klein Richard I.
McKee Christopher F.
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