Small‐Scale Interaction of Turbulence with Thermonuclear Flames in Type Ia Supernovae | Zendy

J. C. Niemeyer | Zendy; W. K. Bushe | Zendy; G. R. Ruetsch | Zendy

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Small‐Scale Interaction of Turbulence with Thermonuclear Flames in Type Ia Supernovae

Author(s) -

J. C. Niemeyer,

W. K. Bushe,

G. R. Ruetsch

Publication year - 1999

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/307813

Subject(s) - laminar flow , turbulence , physics , thermonuclear fusion , supernova , mechanics , flame speed , detonation , laminar flame speed , deflagration , context (archaeology) , premixed flame , astrophysics , chemistry , plasma , explosive material , combustion , nuclear physics , geology , combustor , organic chemistry , paleontology

Microscopic turbulence-flame interactions of thermonuclear fusion flamesoccuring in Type Ia Supernovae were studied by means of incompressible directnumerical simulations with a highly simplified flame description. The flame istreated as a single diffusive scalar field with a nonlinear source term. It ischaracterized by its Prandtl number, Pr << 1, and laminar flame speed, S_L. Wefind that if S_L ~ u', where u' is the rms amplitude of turbulent velocityfluctuations, the local flame propagation speed does not significantly deviatefrom S_L even in the presence of velocity fluctuations on scales below thelaminar flame thickness. This result is interpreted in the context ofsubgrid-scale modeling of supernova explosions and the mechanism fordeflagration-detonation-transitions.Comment: 8 pages, 6 figures, accepted by Astrophys.

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