SASI in Three Dimensions

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Project Details

Results

Hydrodynamics Code

• VH-1, an ideal gas dynamics code based on the PPMLR algorithm
• Slab decomposition and MPI for parallel communications
• Yin-Yang overset spherical grids avoid coordinate singularity of z axis
• 360 (logarithmically spaced) radial zones from 0.3 to 3.0 (shock at 1.0)
• angular resolution of 0.77 degrees
• explicit conservation of angular momentum
• explicit conservation of total energy including fixed gravitational potential
• dissipation at stationary shock front to minimize numerical noise

Initial Conditions

• Highly supersonic infall at constant mass accretion rate from outer boundary
• reflecting boundary at inner radius (stellar surface)
• 'optically thin' cooling parameterized by alpha=1.5, beta=2.5
• strength of cooling is adjusted to place the steady-state shock at a radius of 1.0

Diagnostics