ZURUECK HOCH VOR INHALT SUCHEN

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Proposing Institution

Max Planck Institute for Astrophysics
Project Manager

Apl. Prof. Dr. rer. nat. Hans-Thomas Janka
Karl-Schwarzschild-Straße 1
85740 Garching
Abstract
In short, the results of one-dimensional stellar evolution models depend on recipes for convection, mixing, and diffusion deep inside the stars. Three-dimensional simulations are required to make more reliable models which are independent of the choice of these recipes. In addition, the three-dimensional models show asymmetries which may aid the subsequent neutrino-driven explosion. We aim to extend our studies on the pre-collapse evolution of supernova progenitors. We have simulated seven minutes of oxygen burning phase of a massive star (18.88 Solar Mass) prior to collapse. The initial model is unstable against convection and with time we observe the development of large-scale modes in the flow. The behavior of convection is quite different in such a system. Convective eddies bring lighter elements into the inner burning zone where they can be burnt episodically at a much faster rate which further powers convection leading to transient large-scale flows. This is an example of a “reactive-convective” hydrodynamic system. We want to extend the simulation to an hour before the collapse to understand the development of such transients in the flow caused by episodic nuclear burning. In our previous simulations, we note that the density perturbations are reflected back into the computational domain at the outer boundary. The main aim of the test project is twofold: 1) study the effect of boundary condition (reflective vs. outflow) 2) get the strong scaling performance of the setup. The test simulation will be done using hydrodynamics module of the PROMETHEUS code.

Impressum, Conny Wendler