Power-law wrinkling turbulence-flame interaction model for astrophysical flames

Journal Article · Tue Apr 01 04:00:00 EDT 2014 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/784/2/174· OSTI ID:22357241

Jackson, Aaron P. ^[1]; Townsley, Dean M. ^[2]; Calder, Alan C. ^[3]

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1. Laboratories for Computational Physics and Fluid Dynamics, Naval Research Laboratory, Washington, DC (United States)
2. Department of Physics and Astronomy, The University of Alabama, Tuscaloosa, AL (United States)
3. Department of Physics and Astronomy, The State University of New York - Stony Brook, Stony Brook, NY (United States)

We extend a model for turbulence-flame interactions (TFI) to consider astrophysical flames with a particular focus on combustion in Type Ia supernovae. The inertial range of the turbulent cascade is nearly always under-resolved in simulations of astrophysical flows, requiring the use of a model in order to quantify the effects of subgrid-scale wrinkling of the flame surface. We provide implementation details to extend a well-tested TFI model to low-Prandtl number flames for use in the compressible hydrodynamics code FLASH. A local, instantaneous measure of the turbulent velocity is calibrated for FLASH and verification tests are performed. Particular care is taken to consider the relation between the subgrid rms turbulent velocity and the turbulent flame speed, especially for high-intensity turbulence where the turbulent flame speed is not expected to scale with the turbulent velocity. Finally, we explore the impact of different TFI models in full-star, three-dimensional simulations of Type Ia supernovae.

• OSTI ID: 22357241
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 784; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ABUNDANCE
ASTROPHYSICS
COMBUSTION
FLAMES
HYDRODYNAMICS
INTERACTIONS
NUCLEAR REACTIONS
NUCLEOSYNTHESIS
PRANDTL NUMBER
SIMULATION
SUPERNOVAE
SURFACES
THREE-DIMENSIONAL CALCULATIONS
TURBULENCE
VELOCITY
VERIFICATION