Luminosity driven shell convection in an AGB star
(200x100 points, movies covering about 4300 sec)

Entropy fluctuations and bubbles als flow tracers.
Pressure fluctuations and isotherms.
The plumes "push" the material and cause a pressure excess. At the upper boundary to pressure excess can not easily propate. The flow is bent sidewise and extends slightly into the stable layers. Here, gravity waves are excited.