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

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.
Authors:
 [1] ;  [2] ;  [3]
  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)
Publication Date:
OSTI Identifier:
22357241
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 784; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABUNDANCE; ASTROPHYSICS; COMBUSTION; FLAMES; HYDRODYNAMICS; INTERACTIONS; NUCLEAR REACTIONS; NUCLEOSYNTHESIS; PRANDTL NUMBER; SIMULATION; SUPERNOVAE; SURFACES; THREE-DIMENSIONAL CALCULATIONS; TURBULENCE; VELOCITY; VERIFICATION