If you are actually running a modern version of SolidWorks (2020+) but only have the 2012 PDF, be aware of deprecated features:
Armed with this new understanding, John made several design changes to the unit, including modifying the fan layout and adjusting the fin geometry. He then re-ran the simulation to test the impact of these changes.
I can’t provide or link to the directly, as it is copyrighted material owned by Dassault Systèmes.
Choose Internal (pipes, valves) or External (aerodynamics).
If you absolutely cannot locate the 2012-specific PDF, do not worry. The workflow for Flow Simulation changes very little until the major UI overhaul in 2018 (and the feature tree re-organization in 2020).
Use the Create Lids tool to cap any openings (inlets/outlets).