Physics – Fluid Dynamics
Scientific paper
Nov 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..dfd.ml007g&link_type=abstract
American Physical Society, Division of Fluid Dynamics 56th Annual Meeting, November 23-25, 2003, East Rutherford, New Jersey, ME
Physics
Fluid Dynamics
Scientific paper
Our previous three-dimensional numerical simulations of turbulent thermonuclear deflagrations in a white dwarf (WD) have shown that the deflagration leaves large amounts of unburnt carbon and oxygen near the center of the star. This disagrees with observations and suggests that the deflagration may trigger a detonation. We study this possibility using a three-dimensional model based on reactive Euler equations and a simplified kinetics of energy release. The explosion begins as a deflagration controlled by the Rayleigh-Taylor instability. The turbulent combustion and convective flows produce a very inhomogeneous mixture of burned and unburned materials that extends from the center to about 0.5-0.8 of the radius of the expanding WD. Then a detonation is ignited and propagates through the layers of unburned material with the velocity about 12,000 km/s, which is comparable to the expansion velocities induced in outer layers of the WD by the subsonic burning. The detonation releases additional energy, and partially smoothes out composition inhomogeneities created by the turbulent deflagration in inner parts of the WD. The resulting explosion parameters are in agreement with observations.
Gamezo Vadim N.
Khokhlov Alexei M.
Oran Elaine S.
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