Type of Document Thesis Author Guzman, James Author's Email Address firstname.lastname@example.org URN etd-08182009-070604 Title Adaptive Mesh Hydrodynamics of Non-Spherical Core-Collapse Supernovae Degree Master of Science Department Scientific Computing, Department of Advisory Committee
Advisor Name Title Tomasz Plewa Committee Chair Gordon Erlebacher Committee Member Peter Hoeflich University Representative Keywords
Date of Defense 2009-07-29 Availability unrestricted AbstractWe study a hydrodynamic evolution of a non-spherical core-collapse supernova in
multidimensions. We begin our study from the moment of shock revival and continue for
the first week after explosion when expansion of the supernova ejecta becomes homologous.
We observe growth and interaction of Richtmyer-Meshkov, Rayleigh-Taylor, and Kelvin-
Helmholtz instabilities resulting in an extensive mixing of the heavy elements throughout
We obtain a series of models at progressively higher resolution and provide preliminary
discussion of numerical convergence. Unlike in the previous studies, our computations
are performed in a single domain. Periodic mesh mapping is avoided. This is
made possible by employing an adaptive mesh refinement strategy in which computational
workload (defined as a product of the total number of computational cells and the length of
the time step) is monitored and, if necessary, limited.
Our results are in overall good agreement with the simulations reported by Kifonidis et
al. We demonstrate, however, that the amount of mixing and kinematic properties of
radioactive species (i.e. 56Ni) is extremely anisotropic. In particular, we find that the model
displays a strong tendency to expand laterally away from the equatorial plane toward the
poles. Although this behavior is usually attributed to numerical artifacts characteristic of
computations with assumed symmetry (axis-effect), the observed behavior can be attributed
to a large heat content of the equatorial regions of the explosion model. Future studies are
needed to verify that this explosion model property does not have a systematic character.
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