Abstract
Three-dimensional particle tracking velocimetry is used to characterize the time-resolved turbulent flow in an asymmetric diffuser. The measurements cover the full diffuser and show that the separated flow consists of large-scale structures with a Strouhal number smaller than 0.03. Three large vortices are identified; two vortices originate from the wall with the largest diverging angle and the third vortex from the neighboring diverging wall.
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