Main Page | See live article | Alphabetical index A vortex is a spinning turbulent flow which resembles a tornado. Or, maybe it is better to say that a tornado is a well known example of a large vortex. A vortex is also formed as water goes down a drain, as in a sink or a toilet. Examples Lift-induced drag of a wing on an aircraft The primary cause of drag in the sail of a sloop Sunspot Tornado Whirlpool See also Strouhal number Shower-curtain effect This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.