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Title: Coherent structures in a turbulent channel flow

Description: We use a method called Direct Lyapunov Exponent to identify coherent structures in a turbulent channel flow. The plane on the top is at a constant distance from the channel wall. In the lower two images, the channel walls are at the top and bottom. The top image is a plane seen by looking down the channel, and the bottom image is a plane seen from looking from the side of the channel. Structures are outlined in black, and are more dominant near the walls, as expected. See also hairpin vortex. *MIT

Credits: M. A. Green, C. W. Rowley & G. Haller*

References: Green, M. A., Rowley, C. W. & Haller, G. Detection of Lagrangian coherent structures in three-dimensional turbulence, Journal of Fluid Mechanics, 572, 2007, 111-120.

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