In Simconnect (part of dev mode), certain airflow scripts can be run. But if you script something, it feels unnatural. People tried in the past, there is Kinetic Assistent Addon which can provide for a “thermal spiral” at specific locations. But it is a separate executable from uncertified source, sometimes triggering virus checks. Upward and downward airflow should be built into the simulation model itself. Upward air flow has to do with temperature ! there are no ventilators in the real sky.
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