Vortex Street
Vortex Street : Also called: Karman vortex street, vortex trail, vortex train: Two parallel rows of alternately-placed vortices along the wave of an obstacle in a fluid of moderate Reynolds number. Fluid drag can be calculated from the motion of these vortices, which are stable only for a certain ratio of the width of the street to the distance between vortices along the street
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