[walakaka]

Hi everyone,

I am currently modelling a two-phase flow through a pipe. I was wondering if the fully developed velocity would be constant (steady-state)?

Kind regards
Shafik

[ashokac7]

Originally Posted by walakaka

Hi everyone,

I am currently modelling a two-phase flow through a pipe. I was wondering if the fully developed velocity would be constant (steady-state)?

Kind regards
Shafik

Buddy that's the definition of fully developed flow right. After entry length, the velocity profile should not change, then it is a fully developed flow, Right !! I am not sure but I don't think number of phases would matter in velocity profile. In fully developed flow you will have same velocity downstream from definite distance from wall. Even for steady state, we extrude the inlet so that we get the fully developed profile at actual inlet and not forced BC's (constant velocity across c/s of inlet). Hope you understand what I mean here.

[walakaka]

Originally Posted by ashokac7

Buddy that's the definition of fully developed flow right. After entry length, the velocity profile should not change, then it is a fully developed flow, Right !! I am not sure but I don't think number of phases would matter in velocity profile. In fully developed flow you will have same velocity downstream from definite distance from wall. Even for steady state, we extrude the inlet so that we get the fully developed profile at actual inlet and not forced BC's (constant velocity across c/s of inlet). Hope you understand what I mean here.

Thanks for your reply! My flow seems to be fluctuating all the way through but my longitudinal Mesh is very coarse. I might try refine it and see if it stabilizes.

I'm simulating oil-water stratified smooth for now

Regards
Shafik