[Hauzen]

Hi.
I am a student studying CFD basic knowledge. I am studying background knowledge. I would appreciate it if you could show me a picture or picture of how the boundary conditions are to interpret the problem below

I'd like to interpret Duct, but I'm a beginner, so I don't know what to do with the boundary conditions.
I would like to interpret it as the problem below.
Q. There is a 200A circular duct. The right end has 8m/s and 15CMM air volume because it is a mid-air exhaust. The left end is atmospheric.
What is the air volume on the left?

I wonder how to interpret the air volume in the boundary conditions of the problem.

[W!ldejon]

If you have a fixed velocity at the outlet, unless it changes density - you can assume the same at the inlet.
So inlet = 8 m/s
Outlet = your known pressure