Hi guys,

Im a student studying mechanical engineering, and am currently doing a final year project on flow analysis of air through an impulse turbine. I have never used CFD before up until five weeks ago, I've done alot of research on the software and am kinda getting up to speed.

I'm running the study as an internal flow, with the impulse turbine situated in a pipe. I'm running into difficulty when it comes to setting up the boundaries on my study. I've set the inlet boundary to a volume flow rate of 1.27m3/s. The boundary condition for the outlet says it has to be set at a pressure value (static). How do i avoid setting it to a pressure value, as one of my goals in running the study is analysing the change in pressure of the air as it enters the nozzle and the pressure as it exits the diffuser. If i have the oultet boundary set at amospheric pressure, is that not interfering with the calculations. I have a rotating region set about the blades also.