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Tomographic and time resolved PIV measurements on a finite cylinder mounted on a flat plate

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Abstract

Tomographic and time resolved PIV measurements were performed to examine the 3D flow topology and the flow dynamic above the upper surface of a low-aspect ratio cylinder at Re ≈ 1 ×  105. This generic experiment is of fundamental interest because it represents flow features which are relevant to many applications such as laminar separation bubbles and turbulent reattachment. At Re  ≈ 1 × 105, laminar separation bubbles arise on the side of the cylinder. Furthermore, on the top of the cylinder a separation with reattachment is of major interest. The tomographic PIV measurement, which allows to determine all three velocity components in a volume instantaneously, was applied to examine the flow topology and interaction between the boundary layer and wake structures on the top of the finite cylinder. In the instantaneous flow fields the tip vortices and the recirculation region becomes visible. However, it is also observed that the flow is quite unsteady due to the large separation occurring on the top of the cylinder. In order to study the temporal behaviour of the separation, time resolved PIV was applied. This technique allows capturing the dynamic processes in detail. The development of vortices in the separated shear layer is observed and in addition regions with different dominant frequencies are identified.

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Acknowledgments

The authors acknowledge the support by PCO for providing two PCO pco.4000 cameras for the tomographic PIV measurements. This research has been supported by the German Research Foundation (DFG) in the priority program 1147 "Bildgebende Messverfahren für die Strömungsanalyse".

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Author notes

  1. Rainer Hain

    Present address: Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institut für Aerodynamik und Strömungstechnik, Lilienthalplatz 7, 38108, Brunswick, Germany

  2. Christian J. Kähler

    Present address: Institut für Strömungsmechanik und Aerodynamik LRT-7, Universität der Bundeswehr München, Werner-Heisenberg-Weg 39, 85577, Neubiberg, Germany

Authors and Affiliations

  1. Institut für Strömungsmechanik, Technische Universität Braunschweig, Bienroder Weg 3, 38106, Brunswick, Germany

    Rainer Hain & Christian J. Kähler

  2. LaVision GmbH, Anna-Vandenhoeck-Ring 19, 37081, Göttingen, Germany

    Dirk Michaelis

Authors
  1. Rainer Hain
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  2. Christian J. Kähler
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  3. Dirk Michaelis
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Correspondence to Christian J. Kähler.

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Hain, R., Kähler, C.J. & Michaelis, D. Tomographic and time resolved PIV measurements on a finite cylinder mounted on a flat plate. Exp Fluids 45, 715–724 (2008). https://doi.org/10.1007/s00348-008-0553-x

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  • DOI: https://doi.org/10.1007/s00348-008-0553-x

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