hi. Why durind defining a phases in VOF (I have a liquid and gas phase) primary phase should be "lighter" gas (air) phase and the secondary phase should be liquid phase (water)??

Go back to Fluent manuals (Multiphase modeling), you'll get detailed explainations.

BA

hy greg for change natur of fluid (air, water, vap....) go to define materials (after chose the VOF model for exp) in this window click Brows and chose your fluid thanck's

thank you

reards g