Front propagation in pre-mixed material: approaches to modeling thermonuclear flames

Details Front propagation in pre-mixed material: approaches to modeling thermonuclear flames Front propagation in pre-mixed material: approaches to modeling thermonuclear flames

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.8613y&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #86.13; Bulletin of the American Astronomical Society, Vol. 31, p.978

Astronomy and Astrophysics

Astronomy

Scientific paper

The interaction of thermonuclear fusion flames with turbulent flows is studied by means of incompressible DNS with a simplified flame description. This interaction plays an important role in flame propagation in Type Ia supernovae. The flame is treated as a single diffusive scalar field with a nonlinear source term (the nuclear reaction rate), and is characterized by the Prandtl number (Pr, the ratio of kinematic viscosity to thermal diffusivity and Pr << 1 in our cases), and laminar flame speed, S_L. We simulate the propagation of such a flame through a stirred, turbulent velocity field, and study the increase of flame propagation speed due to turbulent mixing. A previous study (J.C. Niemeyer, W.K. Bushe, and G.R. Guetsch) shows that if S_L >= u(') , where u(') is the rms turbulent velocity fluctuation, the local flame propagation speed does not significantly deviate from S_L even in the presence of velocity fluctuations on scales below the laminar flow thickness. The ratio S_L/u(') in this study is limited to values greater or closer to 1. In the present study, we perform the same simulation for S_L/u(') << 1 and compare results to the previous study.

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