220 citations · 1.5k across the 60 of their papers we have counts for
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Turbulence-Flame Interactions in Type Ia Supernovae
A. J. Aspden, J. B. Bell, M. S. Day +2
The large range of time and length scales involved in type Ia supernovae (SN Ia) requires the use of flame models. As a prelude to exploring various options for flame models, we co…
Propagation of the First Flames in Type Ia Supernovae
M. Zingale, L. J. Dursi
We consider the competition of the different physical processes that can affect the evolution of a flame bubble in a Type Ia supernovae -- burning, turbulence and buoyancy. Even in…
New Approaches for Modeling Type Ia Supernovae
M. Zingale, A. S. Almgren, J. B. Bell +3
Type Ia supernovae (SNe Ia) are the largest thermonuclear explosions in the Universe. Their light output can be seen across great distances and has led to the discovery that the ex…
The Physics of Flames in Type Ia Supernovae
M. Zingale, S. E. Woosley, J. B. Bell +2
We extend a low Mach number hydrodynamics method developed for terrestrial combustion, to the study of thermonuclear flames in Type Ia supernovae. We discuss the differences betwee…
Three-dimensional Numerical Simulations of Rayleigh-Taylor Unstable Flames in Type Ia Supernovae
M. Zingale, S. E. Woosley, C. A. Rendleman +2
Flame instabilities play a dominant role in accelerating the burning front to a large fraction of the speed of sound in a Type Ia supernova. We present a three-dimensional numerica…
Direct Numerical Simulations of Type Ia Supernovae Flames II: The Rayleigh-Taylor Instability
J. B. Bell, M. S. Day, C. A. Rendleman +2
A Type Ia supernova explosion likely begins as a nuclear runaway near the center of a carbon-oxygen white dwarf. The outward propagating flame is unstable to the Landau-Darrieus, R…
Direct Numerical Simulations of Type Ia Supernovae Flames I: The Landau-Darrieus Instability
J. B. Bell, M. S. Day, C. A. Rendleman +2
Planar flames are intrinsically unstable in open domains due to the thermal expansion across the burning front--the Landau-Darrieus instability. This instability leads to wrinkling…
Efficiency Gains from Time Refinement on AMR Meshes and Explicit Timestepping
L. J. Dursi, M. Zingale
Block-structured AMR meshes are often used in astrophysical fluid simulations, where the geometry of the domain is simple. We consider potential efficiency gains for time sub-cycli…
Morphology of Rising Hydrodynamic and Magneto-hydrodynamic Bubbles from Numerical Simulations
K. Robinson, L. J. Dursi, P. M. Ricker +11
Recent Chandra and XMM-Newton observations of galaxy cluster cooling flows have revealed X-ray emission voids of up to 30 kpc in size that have been identified with buoyant, magnet…
On Heavy Element Enrichment in Classical Novae
A. Alexakis, A. C. Calder, A. Heger +10
Many classical nova ejecta are enriched in CNO and Ne. Rosner et al. recently suggested that the enrichment might originate in the resonant interaction between large-scale shear fl…
The Response of Model and Astrophysical Thermonuclear Flames to Curvature and Stretch
L. J. Dursi, M. Zingale, A. C. Calder +11
Critically understanding the `standard candle'-like behavior of Type Ia supernovae requires understanding their explosion mechanism. One family of models for Type Ia Supernovae beg…
Investigations of Pointwise Ignition of Helium Deflagrations on Neutron Stars
M. Zingale, S. E. Woosley, A. Cumming +7
We look at the spreading of localized temperature perturbations in the accreted fuel layer of a non-rotating neutron star. The pressure at the base of the accreted fuel layer is la…
Mapping Initial Hydrostatic Models in Godunov Codes
M. Zingale, L. J. Dursi, J. ZuHone +12
We look in detail at the process of mapping an astrophysical initial model from a stellar evolution code onto the computational grid of an explicit, Godunov type code while maintai…
Onset of Convectionon a Pre-Runaway White Dwarf
L. J. Dursi, A. C. Calder, A. Alexakis +7
Observed novae abundances and explosion energies estimated from observations indicate that there must be significant mixing of the heavier material of the white dwarf (C+O) into th…
Mixing by Non-linear Gravity Wave Breaking on a White Dwarf Surface
A. C. Calder, A. Alexakis, L. J. Dursi +7
We present the results of a simulation of a wind-driven non-linear gravity wave breaking on the surface of a white dwarf. The ``wind'' consists of H/He from an accreted envelope, a…
On Validating an Astrophysical Simulation Code
A. C. Calder, B. Fryxell, T. Plewa +15
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 compres…
Simulations of Astrophysical Fluid Instabilities
A. C. Calder, B. Fryxell, R. Rosner +7
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 The…
Large-Scale Simulations of Clusters of Galaxies
P. M. Ricker, A. C. Calder, L. J. Dursi +9
We discuss some of the computational challenges encountered in simulating the evolution of clusters of galaxies. Eulerian adaptive mesh refinement (AMR) techniques can successfully…