Simulated streamlines offer a clear visualization of radial trailing vortices between blades in a von Kármán water experiment.

From the article:

Kinematic $\alpha$ Tensors and Dynamo Mechanisms in a von Kármán Swirling Flow
F. Ravelet, B. Dubrulle, F. Daviaud, and P.-A. Ratié
Phys. Rev. Lett. 109, 024503 (2012)

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