The Core Helium Flash: 3D Hydrodynamic Models

Miroslav Mocák () and Ewald Müller ()
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Miroslav Mocák: Max-Planck-Institut für Astrophysik
Ewald Müller: Max-Planck-Institut für Astrophysik

A chapter in High Performance Computing in Science and Engineering, Garching/Munich 2009, 2010, pp 323-334 from Springer

Abstract: Abstract We continue our study of turbulent convection during the core helium flash close to its peak by comparing the results of 2D and 3D hydrodynamic simulations performed with our multidimensional Eulerian hydrodynamics code HERAKLES on the ALTIX 4700 computer of the LRZ. In our previous study based on well resolved 2D and coarsely resolved 3D models covering only the onset of convection we found that (i) the temporal evolution and properties of the convection are similar to those predicted by quasi-hydrostatic stellar evolutionary calculations, and that (ii) the core helium flash does not lead to any explosive behavior. These results are confirmed by our new well resolved 3D models covering longer evolutionary periods. They also show that the flow patterns developing in the 3D models are structurally different from those of the corresponding 2D ones, and that the typical convective velocities in these models are smaller than those in their 2D counterparts. The 3D models also tend to agree better with the predictions of mixing length theory. Our hydrodynamic simulations further show the presence of turbulent entrainment that results in a growth of the convection zone on a dynamic time scale.

Keywords: Convection Zone; Stable Layer; Entrainment Rate; Hydrodynamic Simulation; Turbulent Convection (search for similar items in EconPapers)
Date: 2010
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-3-642-13872-0_27

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DOI: 10.1007/978-3-642-13872-0_27

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