2003/12/03 by F. K. Roepke, F. K. Röpke, W. Hillebrandt +1
Chemistry · Engineering · Physics and Astronomy · #Astrophysics #Chemistry #Combustion #Combustion and Detonation Processes #Combustor #Deflagration #Detonation #Explosive material #Flame speed #Gamma-ray bursts and supernovae #Instability #Laser-Plasma Interactions and Diagnostics #Materials science #Mechanics #Physics #Premixed flame #Range (aeronautics) #Supernova #Turbulence #astro-ph
paper · pdf · doi:10.1051/0004-6361:20035721
published as Astron.Astrophys.420:411-422,2004 · 12 pages, 2 tables, 10 figures, resolution of figures degraded due to archive file size restrictions, submitted to A&A
arxiv created 2003/12/03 · openalex publication_date 2004/05/28 · arxiv updated 2009/12/01 · openalex created_date 2019/06/27 · openalex updated_date 2026/08/05
We present a numerical investigation of the cellular burning regime in Type Ia supernova explosions. This regime holds at small scales (i.e. below the Gibson scale), which are unresolved in large-scale Type Ia supernova simulations. The fundamental effects that dominate the flame evolution here are the Landau-Darrieus instability and its nonlinear stabilization, leading to a stabilization of the flame in a cellular shape. The flame propagation into quiescent fuel is investigated addressing the dependence of the simulation results on the specific parameters of the numerical setup. Furthermore, we investigate the flame stability at a range of fuel densities. This is directly connected to the questions of active turbulent combustion (a mechanism of flame destabilization and subsequent self-turbulization) and a deflagration-to-detonation transition of the flame. In our simulations we find no substantial destabilization of the flame when propagating into quiescent fuels of densities down to ∼, corroborating fundamental assumptions of large-scale SN Ia explosion models. For these models, however, we suggest an increased lower cutoff for the flame propagation velocity to take the cellular burning regime into account.