An eddy is the swirling of a fluid and the reverse current
created when the fluid flows past an obstacle. The moving fluid creates a space
devoid of downstream-flowing fluid on the downstream side of the object. Fluid
behind the obstacle flows into the void creating a swirl of fluid on each edge
of the obstacle, followed by a short reverse flow of fluid behind the obstacle
flowing upstream, toward the back of the obstacle. This phenomenon is most
visible behind large emergent rocks in swift-flowing rivers.
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