[FutureCX]

Hi everyone,

I am simulating the inner flow field of part of water pipeline. The VOF model was appplied as the flow is open channel flow. The inlet boundary was set as mass flow inlet.

I am confused about the outlet boundary condition now. Should I use pressure outlet or outflow boundary condition? If I use pressure outlet boundary, what gauge pressure should I give when the outlet boundary do not connect with atmosphere? If I use outflow boundary condition, the air phase is compressible , which Ansys User's guide don't recommed using outflow boundary for compressible phase.

Can anyone give me some suggestions on my problem? Thanks in advance.