Cranking the vorticity confinement to the maximum can have some bizarre effects. Note that a vorticity confinement value of 1.0 doesn't seem to save, so I went with 0.99 (which appears to be the maximum saveable value).
Comments
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Weird, but with values that high this is what you can expect from the air sim. You've just made an extremely tight tube for air to flow and set the constants really high lol.
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This effect seems to persist (albeit slowed down) at vorticity confinement values as low as 0.2 (only somewhat higher than the default of 0.1).