slipstreams
Slipstreams, also known as vortex rings or toroidal vortices, are a phenomenon observed in fluids, most commonly air or water. They consist of a torus-shaped region in which a fluid is spinning in a circle. The fluid moves down through the center of the ring and up around the outside. This self-contained motion allows the ring to travel a significant distance without dissipating quickly.
Slipstreams are created when a fluid is ejected from an opening in a specific manner. For example,
These vortex rings have applications in various fields. In nature, they can be observed in the wake