"Coherent Vorticity Holes from 2D Turbulence
Decaying in a Background Shear Flow"

X-P Huang, K S Fine, C F Driscoll
Physical Review Letters 74.22 (29 May 1995): 4424

"The holes tend to settle into symmetric configurations in the column*, give a negative skew to the measured vorticity fluctuations, and are eventually destroyed due to a slow outward radial creep."

*i.e., freely decaying 2D turbulence in magnetized electron columns

another view:
vortices in ply
(cascade model)

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