What transients are there in the air flow? I ask as trying to model a whole room domain (air change rates in the order of 10's of minutes) relative to the flow transient time scale (fractions of a second) can become excessively long. Running transient particles onto a steady airflow is much more efficient.Â
Don't use the DEM option, if you have enough particles in the system to need DEM you'll struggle to breathe the air.... You may also want to clean up (remove) the various doors/details unless you intend to mesh at that level of detail, and I don't recommend that!Â
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