Tomasz Plewa

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We present a case study of validating an astrophysical simulation code. Our study focuses on validating FLASH, a parallel, adaptive-mesh hydrodynamics code for studying the compressible, reactive flows found in many astrophysical environments. We describe the astrophysics problems of interest and the challenges associated with simulating these problems. We(More)
and the effects of long-wavelength modes C. C. Kuranz, R. P. Drake, M. J. Grosskopf, A. Budde, C. Krauland, D. C. Marion, A. J. Visco, J. R. Ditmar, H. F. Robey, B. A. Remington, A. R. Miles, A. B. R. Cooper, C. Sorce, T. Plewa, N. C. Hearn, K. L. Killebrew, J. P. Knauer, D. Arnett, and T. Donajkowski University of Michigan, Ann Arbor, Michigan 48109, USA(More)
We have performed two-dimensional simulations of core collapse supernovae that encompass shock revival by neutrino heating, neutrino-driven convection, explosive nucleosynthesis, the growth of Rayleigh-Taylor instabilities, and the propagation of newly formed metal clumps through the exploding star. A simulation of a Type II explosion in a 15 M⊙ blue(More)
Twoand three-dimensional simulations demonstrate that hydrodynamic instabilities can lead to low-mode (l = 1, 2) asymmetries of the fluid flow in the neutrino-heated layer behind the supernova shock. This provides a natural explanation for aspherical mass ejection and for pulsar recoil velocities even in excess of 1000 km/s. We propose that the bimodality(More)
This paper shows results from experiments diagnosing the development of the Rayleigh–Taylor instability with two-dimensional initial conditions at an embedded, decelerating interface. Experiments are performed at the Omega Laser and use∼5 kJ of energy to create a planar blast wave in a dense, plastic layer that is followed by a lower density foam layer. The(More)
Two-dimensional simulations of strongly anisotropic supernova explosions of a nonrotating 15 M⊙ blue supergiant progenitor are presented, which follow the hydrodynamic evolution from times shortly after shock formation until hours later. It is shown that explosions which around the time of shock revival are dominated by low-order unstable modes (i.e. by a(More)
Assuming that the neutrino luminosity from the neutron star core is sufficiently high to drive supernova explosions by the neutrino-heating mechanism, we show that low-mode (l=1,2) convection can develop from random seed perturbations behind the shock. A slow onset of the explosion is crucial, requiring the core luminosity to vary slowly with time, in(More)
Understanding the nature of turbulent flows remains one of the outstanding questions in classical physics. Significant progress has been made recently using computer simulation as an aid to our understanding of the rich physics of turbulence. Here we present both the computer science and scientific features of a unique terascale simulation of a(More)