  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.
