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Particles 2018, 1(1), 97-110; https://doi.org/10.3390/particles1010007

Turbulence Generation by Shock-Acoustic-Wave Interaction in Core-Collapse Supernovae

1
Department of Physics, School of Science and Technology, Nazarbayev University, Astana 010000, Kazakhstan
2
Fluid Mechanics Group, Escuela Politécnica Superior, Universidad Carlos III de Madrid, 28911 Leganés, Spain
*
Author to whom correspondence should be addressed.
Received: 11 April 2018 / Revised: 30 April 2018 / Accepted: 1 May 2018 / Published: 7 May 2018
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Abstract

Convective instabilities in the advanced stages of nuclear shell burning can play an important role in neutrino-driven supernova explosions. In our previous work, we studied the interaction of vorticity and entropy waves with the supernova shock using a linear perturbations theory. In this paper, we extend our work by studying the effect of acoustic waves. As the acoustic waves cross the shock, the perturbed shock induces a field of entropy and vorticity waves in the post-shock flow. We find that, even when the upstream flow is assumed to be dominated by sonic perturbations, the shock-generated vorticity waves contain most of the turbulent kinetic energy in the post-shock region, while the entropy waves produced behind the shock are responsible for most of the density perturbations. The entropy perturbations are expected to become buoyant as a response to the gravity force and then generate additional turbulence in the post-shock region. This leads to a modest reduction of the critical neutrino luminosity necessary for producing an explosion, which we estimate to be less than ~5%. View Full-Text
Keywords: hydrodynamics; shock waves; turbulence; supernovae: general hydrodynamics; shock waves; turbulence; supernovae: general
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Abdikamalov, E.; Huete, C.; Nussupbekov, A.; Berdibek, S. Turbulence Generation by Shock-Acoustic-Wave Interaction in Core-Collapse Supernovae. Particles 2018, 1, 97-110.

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