Dynamic Impact of Non-uniform Ejecta in Supernovae Remnants.

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Title: Dynamic Impact of Non-uniform Ejecta in Supernovae Remnants.
Author: Lyerly, William Joseph
Advisors: Dr. John Blondin, Committee Chair
Dr. Kazimierz Borkowski, Committee Member
Dr. David Brown, Committee Member
Abstract: Historically, the evolution of supernovae (SNe) and their remnants has been studied using simple analytical models with ideal case assumptions. As available computing power increases, numerical solutions for complex scenarios become more realistic. In this project, a custom computing cluster was built in order to perform three dimensional SN blastwave simulations. The standard model of a smooth SN ejecta was modified to include pockets of low density material, created by γ-ray heating from the decay of unstable heavy elements. We investigate the dynamic impact of these low density bubbles on the hydrodynamic structure of the blastwave and present observable traits that should appear in the presence of bubbles. Low density pockets in the ejecta effect a rise in the turbulent energy of the system, a decrease in the effectiveness with which ejecta are decelerated and a large spread in the temperature of emitting gas. These characteristics are matched with observational data from the literature. In particular, Cas A demonstrates all three primary effects.
Date: 2002-11-04
Degree: MS
Discipline: Physics
URI: http://www.lib.ncsu.edu/resolver/1840.16/2043


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