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Abstract
This thesis presents multidimensional hydrodynamic simulations of stellar interiors with a focus on dynamical phenomena at low Mach numbers using the Seven-League Hydro (SLH) code. A better understanding of these phenomena is crucial to improve the modeling of stellar evolution. It is demonstrated that suitable numerical methods are required to avoid that numerical artifacts and spurious dissipation dominate the actual physical flow. Three-dimensional simulations of convective helium shell burning are used to measure the entrainment of mass into the convective region. This aids the parametrization of entrainment in one-dimensional evolution calculations. Furthermore, the excitation of waves by core convection is simulated and the results are analyzed regarding their physical plausibility and agreement with observations. These simulations demonstrate that the current set of numerical methods used by the SLH code is promising regarding future, more realistic simulations of astrophysical flows.
Document type: | Dissertation |
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Supervisor: | Röpke, Prof. Dr. Friedrich |
Place of Publication: | Heidelberg |
Date of thesis defense: | 1 December 2021 |
Date Deposited: | 10 Dec 2021 08:45 |
Date: | 2021 |
Faculties / Institutes: | The Faculty of Physics and Astronomy > Dekanat der Fakultät für Physik und Astronomie Service facilities > Graduiertenschulen > Graduiertenschule Fundamentale Physik (HGSFP) Service facilities > Heidelberg Institute for Theoretical Studies (HITS) |
DDC-classification: | 520 Astronomy and allied sciences 530 Physics |
Controlled Keywords: | Numerische Strömungssimulation, Konvektion, Sternentwicklung |