multiphase boiling / fluid morphology
 

hi

I`m trying to simulate evaporation of Water.
Basic Geometry is a Cylinder which is partially filled with water (~50 %) and above the Water is Water Vapor.

my problem is that I don`t know which morphology to choose for the Vapor.
Bubbles due to evaporation should be dispersed fluid, but the Vapor in the upper Part should be continous ?

Or could I solve this with 2 different domains ?

Thanks for your Advice !
Jan