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| Recent years have seen the development of a vast number of approaches for detecting coherence in fluid flows, from simple methods based on thresholding to more complex tools rooted in the Lagrangian dynamics of the flow. Lagrangian methods are appealing, particularly for locating transport barriers, since they are based directly on the motion of material. But most current Lagrangian tools for the detection of coherent structures use only the material transport, without considering the wealth of other independent, dynamical information carried by fluid elements. I will discuss recent work on incorporating this additional information into a coherent-structures approach to flow analysis using Lagrangian averaging as a coherence filter, and will present results measured in an experimental quasi-two-dimensional laboratory flow. |
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