Abstract
The turbulent flow over a circular cavity with an aspect ratio of D/H = 2 is investigated by multi-planar stereoscopic particle image velocimetry and with tomographic particle image velocimetry (PIV). The main aim of the study is the flow topology and the turbulent structure of the asymmetrical flow pattern that forms inside the cavity at these specific conditions. The flow field is measured in the vertical symmetry plane to describe the overall recirculation pattern in the cavity and the turbulent shear layer developing from the separation point. In this specific regime the shear layer fluctuations are recognized as those caused by instabilities together with the effect of the incoming boundary layer turbulence. Additional observations performed at several wall-parallel planes at different height inside the cavity allow to further evaluate the secondary flow circulation generated by this asymmetric regime. The observed flow pattern consists of a steady vortex, occupying the entire cavity volume and placed diagonally inside the cavity such to entrain the external flow from one side, capture it into a circulatory motion and eject it from the opposite side of the cavity. The spatial distribution of the turbulent fluctuations also reveals the same structure. The tomographic PIV measurement returns a visual inspection to the instantaneous three-dimensional structure of the turbulent fluctuations, which at the investigated height exhibit a low level of coherence with slightly elongated vortices in the recirculating flow inside the cavity.
Similar content being viewed by others
References
Dybenko J, Hering T, Savory E (2006) Turbulent boundary layer flow over circular cavities. ICAS Hamburg paper 395
Elsinga GE, Van Oudheusden BW, Scarano F (2006) Experimental assessment of tomographic-PIV accuracy. In: 13th international symposium on applications of laser techniques to fluid mechanics, paper 20.5, Lisbon, Portugal
Elsinga GE, Scarano F, Wieneke B, van Oudheusden BW (2006) Tomographic particle image velocimetry. Exp Fluids 41:933–947
Grace SM, Gary Dewar W, Wroblewski DE (2004) Experimental investigation of the flow characteristics within a shallow wall cavity for both laminar and turbulent upstream boundary layers. Exp Fluids 36:791–804
Haigermoser C, Scarano F, Onorato M (2008) 3D flow organization in rectangular cavities with laminar upstream boundary layer. 26th ICAS, paper 299
Hering T, Dybenko J, Savory E (2006) Experimental verification of CFD modeling of turbulent flow over circular cavities using FLUENT. CSME forum
Hiwada M, Kawamura T, Mabuchi I, Kumada M (1983) Some characteristics of the flow pattern and heat transfer past a circular cylindrical cavity. Bull JSME 220 26:1744–1752
Rona A (2007) The acoustic resonance of rectangular and cylindrical cavities. In: 13th AIAA/CEAS aeroacoustics conference (28th AIAA aeroacoustics conference) paper AIAA 2007–3420
Rossiter JE (1964) Wind-tunnel experiment on the flow over rectangular cavities at subsonic and transonic speeds. British ARC R&M no. 3428
Sen SN (1990) Acoustics—waves and oscillations. Wiley Eastern Ltd.
Ukeiley L, Murray N (2005) Velocity and surface pressure measurements in an open cavity. Exp Fluids 38:656–671
Wieneke B (2005) Stereo-PIV using self-calibration on particle images. Exp Fluids 39:267–280
Zou J, Adrian RJ, Balachandar S, Kendall TM (1999) Mechanisms of generating coherent packets of hairpin vortices in channel flow. J Fluid Mech 387:353–396
Acknowledgments
This research project has been supported by a Marie Curie Early Stage Research Training Fellowship of the European Community’s Sixth Framework Programme under contract number MEST CT 2005 020301.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Haigermoser, C., Scarano, F. & Onorato, M. Investigation of the flow in a circular cavity using stereo and tomographic particle image velocimetry. Exp Fluids 46, 517–526 (2009). https://doi.org/10.1007/s00348-008-0577-2
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00348-008-0577-2