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On PIV random error minimization with optimal POD-based low-order reconstruction

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Abstract

Random noise removal from particle image velocimetry (PIV) data and spectra is of paramount importance, especially for the computation of derivative quantities and spectra. Data filtering is critical, as a trade-off between filter effectiveness and spatial resolution penalty should be found. In this paper, a filtering method based on proper orthogonal decomposition and low-order reconstruction (LOR) is proposed. The existence of an optimal number of modes based on the minimization of both reconstruction error and signal withdrawal is demonstrated. A criterion to perform the choice of the optimal number of modes is proposed. The method is validated via synthetic and real experiments. As prototype problems, we consider PIV vector fields obtained from channel flow DNS data and from PIV measurement in the wake of a circular cylinder. We determine the optimal number of modes to be used for the LOR in order to minimize the statistical random error. The results highlight a significant reduction in the measurement error. Dynamic velocity range is enhanced, enabling to correctly capture spectral information of small turbulent scales down to the half of the cutoff wavelength of original data. In addition to this, the capability of detecting coherent structures is improved. The robustness of the method is proved, both for low signal-to-noise ratios and for small-sized ensembles. The proposed method can significantly improve the physical insight into the investigation of turbulent flows.

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Acknowledgments

The authors wish to thank Mr. Carlos Cobos for contributing the realization of the experimental setup, Prof. J. Rodriguez for providing the laser and Lasing S.A. for providing the Andor cameras used in the validation experiment. The authors wish also to thank Dr. A. Sciacchitano for insightful discussions on the validation experiment. This work has been partially supported by grant TRA2013-41103-P of the Spanish Ministry of Economy and Competitiveness. This grant includes FEDER funding.

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Authors and Affiliations

  1. Aerospace Engineering Group, Universidad Carlos III de Madrid, Avenida de la Universidad 30, 28911, Leganés, Spain

    Marco Raiola, Stefano Discetti & Andrea Ianiro

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  1. Marco Raiola
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  2. Stefano Discetti
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  3. Andrea Ianiro
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Correspondence to Marco Raiola.

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Raiola, M., Discetti, S. & Ianiro, A. On PIV random error minimization with optimal POD-based low-order reconstruction. Exp Fluids 56, 75 (2015). https://doi.org/10.1007/s00348-015-1940-8

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  • DOI: https://doi.org/10.1007/s00348-015-1940-8

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