Evacuated tube CFD analysis
 

i completed figure and meshing.

i must use a ANSYS CFD but i don't know what to do.

-heated vapor rises to top
-cooled liquid falls to bottom
my system is here : http://i67.tinypic.com/nbbztk.jpg

What can we do?

This is a multiphase model with phase change - this is a difficult simulation and not one for beginners. I trust you are familiar with the physics of condensation and boiling.