Results of the Numerical Models:

• Small surface and large envelope convection cells co-exist
• Pressure fluctuations deform the star and influence surface convection
• Convective "granulation" pattern with properties differing from solar case

• Large-scale high-contrast brightness fluctuations
• Large atmospheric velocities, high-amplitude shock waves
• "Turbulent pressure" important for atmospheric structure
• Velocities provide some levitation:
  additional wind driving mechanism needed