Question-and-Answer Resource for the Building Energy Modeling Community
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The air speed input for thermal comfort calcs is not something you'll find as an energyplus output. This is the local air speed that is traveling across occupants. Energyplus can't really calculate this. In an ideal world you would have something like a CFD tool to understand the airflow in the space, but this is usually not practical.
Typically you will have to make an assumption here. ASHRAE publishes upper limits to what they consider acceptable air speeds for indoor spaces. There are a few studies which show interior air speeds when using ceiling fans, which I believe can show up to 0.6 m/s of air speed on average when in use.
This thread provides a bit of guidance, suggesting 0.1-0.15 m/s for typical forced air systems. https://www.researchgate.net/post/What_are_reasonable_indoor_air_velocities
