suxy15 / sip

Spherical Inward Propagation Flame in Supernova Type Ia

Spherically Inward Propagating Flame of Type Ia Supernova

Supernova represent the catastrophic explosions that mark the end of the life of some stars. The ejected mass is of order 1 to 10 solar masses with bulk velocities ranging from a few thousand to a few tens of thousands of km/s.[^1] The traditional single Chandrasekhar mass C–O White Dwarf burning is still considered to be responsible for a large population of type Ia supernova (SN Ia). Specifically, one of the key issues in its modeling is related to the flame acceleration and deflagration-detonation transition (DDT), with flame front instabilities being considered as a possible mechanism in driving the acceleration. The perspective of this proposal is to give a set of solutions of this problem. The milestones of this project are planed to be:

​ (a) Complete a set of code that can solve the 1D Hydrogen-Oxygen flame.

​ (b) Complete a set of code that can solve the simplest reacting flow in SN Ia conditions.

​ (c) Try to observe spherical flame acceleration with large Lewis number curvature effect.

​ (d) Try to observe pulsation in Xing & Zhao's case.

​ (e) Try to observe deflagration-detonation transition (DDT) in (d).

For more details, please refer to TheoryGuide.pdf

1. Usage

Please refer to the Makefile and input namelist in src directory.

2. Results

• Outward Hydrogen-Oxygen flame ($t=220\mu s$ and $t=440\mu s$, compiled without -Dsupernova and use the input src/input_hydrogen_outward.nml), initial acceleration and curvature effects are observed in the detected flame speed.

  

• Planar Supernova flame ($t=25$ and $t=40$), not sure for the correctness. The reaction rate coefficients, diffusivities and many other properties are unknown for sure. (compiled with -Dsupernova and use the input src/input_supernova_planar.nml).