[mostafu]

Hello everyone,
I have probably a basic question about the way of solving. I am trying to get the pressure drop value of a multiphase flow in a pipe. The flow is turbulent and I want to get the results when it is fully developed, this is why I choose steady-state not transient actually. However, I got a bit confused because the full domain will be always with the same volume fraction value I put (say 0.5) and the fluid will not get to the regime I expect (plug or stratified), why is that and will that give the true pressure gradient of such a flow? Am I confusing something?