I am trying to model a chilled water piping system that includes a 24" Header that connects (t-shape wise) to the two 20" pipes. I had attempted to use incompressible analysis and set the velocity in to be 136.2 in/s (converted from 16,000 GPM) and pressure out (on the bottom face of the two 20" pipes ) to be 15.5 psi. When I ran the simulation, the pressure results give me around 18-19 psi in the 24" Header, but the calculations that have been done estimate the pressure in the header to be closer to 10 psi, which when would increase to 15.5 psi at the end of the 20" pipe because of elevation change.
However it seems like the elevation change is not being considered in the incompressible case. I had attempted to do the multiphase case, but that does not seem to work well either because after all in the end, I have only chilled water flowing in the pipe in one phase.
The project name is TEST 2 and it is public.