I am trying to model gas through a pipe, with a thin layer of liquid on the inside of the pipe (annular flow). Therefore, there is a clear interface between the two phases, and are not inter-penetrating.

Can I model this using the VOF model? I query this because I want the 2 phases to move at different speeds, and I dont think the VOF allows me to do this.

Thank you in advance.

Hi John

i think you should define two different zones in gambit while making goemetry. then define two fluid for each zone. Now you can apply different velocities to each phase.

your case doesnot lie in the domain of multiphase flow.

With Regards

Ejaz Ahmed

I think VOF is better!

Yes I am now aware that with the VOF model you can have the 2 phases moving at different speeds, but they are the same velocity at the interface. (at the interface there are small liquid particles moving at same velocity as the gas phase at the interface)

Thanks for all your help.