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You have a few strategies, making air run into a sharp edge will create a vortex as the air tries and fails to roll into the low pressure on the other side of the edge. If the air runs along an elliptical shape, you will also create a vortex.

https://www.youtube.com/watch?v=k4h7UKsEwb8

Here you can see a tomato, having an elliptical shape creates a vortex with no sharp edges.

Finally you can induce a vortex by spinning air, for example a vortex tube introduces compressed air through spiral arranged passages.

https://blog.exair.com/wp-content/uploads/2017/07/vt.png

The so called vortex chamber, is really just making passages at an angle so that air swirls as it enters the main tube.

https://www.youtube.com/shorts/pyUXVXNZLHo

Here you can see the principle but used in water, same shit.