What's an eddy? Is it the same thing as vortex?
An eddy is a result of a vortex. Picture a turbulent flow (a vortex) which is at a higher elevation that results in separation. These fluid elements already have vorticity but in addition they are circulating locally downstream of the separation point.
Thank you, but I don't understand
Originally Posted by Ouisch
Results in separation of what? And really "downstream"? Doesn't all the fluid flow downstream? So why do they say the following in Wiktionary?
- A current of air or water running back, or in an opposite direction to the main current. Especially a circular current.
I understand that "running back" is "upstream", isn't it?