Computation of a two-dimensional flow at low viscosity shows a vortex crashing into a wall and then detaching after producing spiral structures.

From the article:

Energy Dissipating Structures Produced by Walls in Two-Dimensional Flows at Vanishing Viscosity
Romain Nguyen van yen, Marie Farge, and Kai Schneider
Phys. Rev. Lett. 106, 184502 (2011)

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