I am attempting a simple internal flow simulation with SolidWorks and I encountered this error message when trying to select a face for atmospheric pressure conditions: "Face is not laying on the boundary between solid and fluid region." After looking around, I found that I should both check for a leak or the recognized volume, which I did and there weren't any leaks but the volume it captured isn't where I want the air to run through. The 2nd picture is where I want the air to run through.
How can I change the recognized volume to be what I want so I can select my boundaries?!
Note: If you open the zip, select the "28mm Restrictor Throttle" assembly.