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Phase-resolved characterization of vortex shedding in the near wake of a square-section cylinder at incidence

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Abstract

The vortex formation and shedding process in the near wake region of a 2D square-section cylinder at incidence has been investigated by means of particle image velocimetry (PIV). Proper orthogonal decomposition (POD) is used to characterize the coherent large-scale flow unsteadiness that is associated with the wake vortex shedding process. A particular application of the POD analysis is to extract the vortex-shedding phase of individual velocity fields, which were acquired at asynchronous low rate with respect to the vortex shedding cycle. The phase of an individual flow field is determined from its projection on the first pair of POD modes, allowing phase averaging of the measurement data to be performed. In addition, a low-order representation of the flow, constructed from the mean and the first pair of POD modes, is found to be practically equivalent to the phase-averaged results. It is shown that this low-order representation corresponds to the basic Fourier component of the flow field ensemble with respect to the reconstructed phase. The phase-averaged flow representations reveal the dominant flow features of the vortex-shedding process and the effect of the angle of incidence upon it.

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Authors and Affiliations

  1. Department of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, 2629 HS, Delft, The Netherlands

    B. W. van Oudheusden, F. Scarano & N. P. van Hinsberg

  2. Department of Mechanical Engineering, University of New Hampshire, Durham, NH, USA

    D. W. Watt

Authors
  1. B. W. van Oudheusden
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  2. F. Scarano
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  3. N. P. van Hinsberg
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  4. D. W. Watt
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Correspondence to B. W. van Oudheusden.

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Oudheusden, B.W.v., Scarano, F., Hinsberg, N.P.v. et al. Phase-resolved characterization of vortex shedding in the near wake of a square-section cylinder at incidence. Exp Fluids 39, 86–98 (2005). https://doi.org/10.1007/s00348-005-0985-5

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  • DOI: https://doi.org/10.1007/s00348-005-0985-5

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