[Tania123]

Hi,
I am trying to simulate multiphase flow through a pipe, using periodic boundary condition.
I want to specify pressure gradient in the periodic boundary condition to have mass flow rate as an output.

However, doing this i am not able to initialize from the periodic as i would usually do when specifying the mass flow rate, and also where do i define the volume fraction when i use periodic boundary condition?

Hope someone can help

thank you