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Visualization of separated shear layer streaks generated by micro vortex generators based on tomographic PIV

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Abstract

Three-dimensional flow fields downstream of micro VGs in backward-facing step (BFS) flow are experimentally investigated by time-resolved tomographic particle image velocimetry (PIV). Streaks within the separated shear layer are visualized by time-averaged velocity field. Complex streamwise vorticity fields are analyzed by proper orthogonal decomposition (POD) and coherent vortex structures are reconstructed by predominant POD mode pairs.

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Acknowledgements

This research was supported by the EU 7th Framework Programme (FP7/2010-2013), “MARS” project (Grant Agreement 266326). The authors gratefully acknowledge technical support by Dr. Reinhard Geisler and Mr. Janos Agocs at the German Aerospace Center (DLR) during the wind tunnel test. We also appreciate Dr. Daniel Schanz for tomographic PIV evaluation work of raw data.

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Authors and Affiliations

  1. Institute of Aerodynamics and Flow Technology, German Aerospace Center (DLR), Bunsenstrasse 10, 37073, Göttingen, Germany

    Xingyu Ma & Andreas Schröder

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  1. Xingyu Ma
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  2. Andreas Schröder
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Correspondence to Xingyu Ma.

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Ma, X., Schröder, A. Visualization of separated shear layer streaks generated by micro vortex generators based on tomographic PIV. J Vis 21, 185–190 (2018). https://doi.org/10.1007/s12650-017-0452-4

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  • DOI: https://doi.org/10.1007/s12650-017-0452-4

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