I am trying to simulate H2 flows through a pipeline.
The simulation completes, but the gas seems to flow backward from inlet rather toward the outlet! I did try to switch the inlet and outlet face when selecting the boundary condition and rerun (Run 5 and 6), but the result is the same. The pressure of inlet is bigger than outlet. See the simulation below (Link imgur if your browser somehow does not support viewing)
Why is it the case? My project is at SimScale