Hello,
I'm trying to simulate air circulation coming from top of stretch, going through the holes of the stretch rod and then into the bottle. I define the top surface of the stretch rod to be the inlet surface with pressure of 4 MPa and the rest of the bottle surface to be the outlet surface with atmospheric pressure. However, air isn't going downwards from the inlet surface as you can see in some of the images provided. I tried running it multiple times with increasing inlet pressure but air just seemed to go upwards instead of downwards in the stretch rod.
