Issue No. 02 - March/April (2009 vol. 11)
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/MCSE.2009.41
Dean M. Townsley , University of Arizona
Due to the small width of the subsonic burning front (flame) in thermonuclear supernovae, micrometers to centimeters, and the influence of turbulence, which adds structure to this front on a broad range of scales, it won't be possible in the foreseeable future to resolve the burning front in full-star simulations with typical scales of thousands of kilometers. This problem is far from unique to astrophysics. In many hydrodynamic studies in the laboratory, including pre-mixed combustion, the viscous scale, at which turbulence is dissipated, and the reaction front can't be resolved in simulations of realistic applications. Under these circumstances, so-called large eddy simulations (LES) are used, which employ models in place of unresolved physics. The adaptation and usage of models for unresolved turbulence and turbulence-flame interaction in simulations of thermonuclear supernovae is discussed. The author contrasts several models in current usage and discusses where there appears to be room for progress.
Computational astrophysics, combustion, turbulence
D. M. Townsley, "Treating Unresolvable Flame Physics in Simulations of Thermonuclear Supernovae," in Computing in Science & Engineering, vol. 11, no. , pp. 18-23, 2009.