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__    __    ______    ______   __   __   _    _   
\ \\ / //  /_   _//  /_   _//  \ \\/ // | \  / || 
 \ \/ //    -| ||-     | ||     \ ` //  |  \/  || 
  \  //     _| ||_    _| ||      | ||   | .  . || 
   \//     /_____//  /__//       |_||   |_|\/|_|| 
    `      `-----`   `--`        `-`'   `-`  `-`

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Text this: Flow transitions in collisions between vortex-rings and density interfaces