Numerical Simulations of Stellar Surface Convection

• Small patches on Sun and solar-like stars: easily done
• Small patches on main-sequences A-type stars: demanding
• Complete envelope of cool supergiants: difficult...
  ... due to necessary resolution and messy physics

What's Needed?

• Grid: 512³ points
• Microphysics: opacities for cool atmospheres (molecules...)
• Radiation transport: non-local, implicit for inner atmosphere
• Radiation transport: non-LTE for outer atmosphere
• Rotation, magnetic fields?
• Dust formation: non-equilibrium description

• Post-Processing (data analysis, synthetic spectra...)