Code Design Decisions

• Dimension
  • 1D? 2D? 3D?
• Grid
  • Cartesian? Spherical? Unstructured?
  • Fixed? Time-dependent? Hierarchical? Adaptive?
• Hydrodynamics
  • Very small velocities? Sonic velocities? Shocks?
  • EOS: Perfect? General?
  • Magnetic fields?
• Radiation transport
  • Diffusion approximation? Local cooling? Non-Local?
  • Microphysics: Idealized? Realistic?
  • Scattering? Non-LTE?
• Solvers
  • Explicit? Implicit? Efficient? Parallel?
  • Simple? Extendable?
• Boundary conditions