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Simulations of Astrophysical Fluid Instabilities

A. C. Calder·B. Fryxell·R. Rosner·L. J. Dursi·K. Olson·P. M. Ricker·F. X. Timmes·M. Zingale·P. MacNeice·H. M. Tufo
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Abstract

We present direct numerical simulations of mixing at Rayleigh-Taylor unstable interfaces performed with the FLASH code, developed at the ASCI/Alliances Center for Astrophysical Thermonuclear Flashes at the University of Chicago. We present initial results of single-mode studies in two and three dimensions. Our results indicate that three-dimensional instabilities grow significantly faster than two-dimensional instabilities and that grid resolution can have a significant effect on instability growth rates. We also find that unphysical diffusive mixing occurs at the fluid interface, particularly in poorly resolved simulations.

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A. C. Calder, B. Fryxell, R. Rosner, L. J. Dursi, K. Olson, P. M. Ricker, F. X. Timmes, M. Zingale, P. MacNeice, H. M. Tufo. 2001-02-14. Simulations of Astrophysical Fluid Instabilities. https://doi.org/10.1063/1.1419596

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