title: Modeling of Silicon Burning during late stages of Stellar Evolution
creator: Michel, Aron
subject: ddc-520
subject: 520 Astronomy and allied sciences
subject: ddc-530
subject: 530 Physics
description: Recent studies with parametrized initial conditions have shown that perturbations in  the flow pattern of the progenitor might be a crucial ingredient to enable more robust  explosions in three-dimensional (3D) simulations of core-collapse supernovae. Those  perturbations naturally develop during the hydrostatic silicon and oxygen burning phases  in a star. However, the impact of perturbations in the progenitor on the dynamics of the  core-collapse supernova largely depends on their magnitude and spatial scale. Accurate  modeling of the progenitor is therefore necessary to obtain a realistic initial model.    In this work we present the first 3D simulations of silicon burning in full 4pi solid  angle. In contrast to previous work, we use the native electron capture rates on 56Fe.  With our 3D simulation we managed to cover 154.41 s with 3.9×10^6 core-hours, which  is still rather CPU-intensive. Future improvements, which would reduce the required  computational resources, are discussed in the thesis. For the 3D simulations in this  thesis, we use a standard Poisson gravity solver on a Cartesian grid, which was developed  and implemented during the course of the thesis. Additionally, we implemented different  methods for solving Poisson’s equation, which also work for curvilinear grids and scale  to a large number of processors.
date: 2019
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/25877/1/phd_thesis_aron_michel.pdf
identifier: DOI:10.11588/heidok.00025877
identifier: urn:nbn:de:bsz:16-heidok-258770
identifier:   Michel, Aron  (2019) Modeling of Silicon Burning during late stages of Stellar Evolution.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/25877/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng