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Examples of flow redirection. Example frames from the forward jet with upstream vortex case showing examples of a bristling scale redirecting the flow: an upstream vortex (a), bifurcation of flow at scale tip (b) and a vortex under the scale (c). Grey vector arrows represent combined PIV and PTV data. Particle paths are shown backward from the current frame, coloured by velocity magnitude. The position of the particle at the current frame is indicated by a black dot.
