Abstract
We present the first 3D simulations of the large-scale mixing that takes place in the shock-heated stellar layers ejected in the explosion of a blue supergiant star. The blast is initiated and powered by neutrino-energy deposition behind the stalled shock by means of choosing sufficiently high neutrino luminosities from the contracting, nascent neutron star, whose high-density core is excised and replaced by a retreating inner grid boundary. The outgoing supernova shock is followed beyond its breakout from the stellar surface about two hours after the core collapse. Violent convective overturn in the post-shock layer causes the explosion to start with significant large-scale asphericity, which acts as a trigger of the growth of Rayleigh-Taylor instabilities at the composition interfaces of the exploding star. Deep inward mixing of hydrogen is found as well as fast-moving, metal-rich clumps penetrating with high velocities far into the hydrogen envelope of the star. Comparing with corresponding 2D (axially symmetric) calculations, we determine the growth of the Rayleigh-Taylor fingers to be faster, the deceleration of the dense metal-carrying clumps in the helium and hydrogen layers to be reduced, the asymptotic clump velocities in the hydrogen shell to be higher, and the outward radial mixing of heavy elements and inward mixing of hydrogen to be more efficient in 3D than in 2D.
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Hammer, N., Janka, HT., Müller, E. (2010). 3D Simulations of Large-Scale Mixing in Core Collapse Supernova Explosions. In: Wagner, S., Steinmetz, M., Bode, A., Müller, M. (eds) High Performance Computing in Science and Engineering, Garching/Munich 2009. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-13872-0_28
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DOI: https://doi.org/10.1007/978-3-642-13872-0_28
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