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             ___      ______    _____    _    _   
  ____      / _ \\   /_   _//  |  ___|| | || | || 
 |    \\   / //\ \\  `-| |,-   | ||__   | || | || 
 | [] ||  |  ___  ||   | ||    | ||__   | \\_/ || 
 |  __//  |_||  |_||   |_||    |_____||  \____//  
 |_|`-`   `-`   `-`    `-`'    `-----`    `---`   
 `-`

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Text this: A visual study of vortex rings fired transversely into a cross-flow