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As I have said, vortex development was the only area where I simply couldn't get my advising experts to agree.
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Mama always told me not to look into the eye's of the sun
But mama, that's where the fun is.
Manfred Mann
I can grok involuting and evoluting pairs, but I can't fathom what a single unpaired vortex can do except exert a retarding force.
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It's off-topic, but I enjoyed this video:
Cavitation - Easily explained!. Turns out when a cavitation bubble collapses, the weakest point collapses into it's antipode and creates a toroid that has a powerful poloidal jet. That's what wreaks havoc with propellers and impellers.