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Thread: Eddy

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    #1

    Eddy

    What's an eddy? Is it the same thing as vortex?

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    #2

    Re: Eddy

    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.

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    #3

    Re: Eddy

    Quote Originally Posted by Ouisch View Post
    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
    Results in separation of what? And really "downstream"? Doesn't all the fluid flow downstream? So why do they say the following in Wiktionary?
    eddy (plural eddies)

    1. 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?

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