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Analysis and reconstruction of a pulsed jet in crossflow by multi-plane snapshot POD

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Abstract

In this work, snapshot proper orthogonal decomposition (POD) is used to study a pulsed jet in crossflow where the velocity fields are extracted from stereoscopic particle image velocimetry (SPIV) results. The studied pulsed jet is characterized by a frequency f = 1 Hz, a Reynolds number Re j  = 500 (based on the mean jet velocity \({\overline{U}_{j}}\) = 1.67 cm/s and a mean velocity ratio of R = 1). Pulsed jet and continuous jet are compared via mean velocity field trajectory and Q criterion. POD results of instantaneous, phase-averaged and fluctuating velocity fields are presented and compared in this paper. Snapshot POD applied on one plane allows us to distinguish an organization of the first spatial eigenmodes. A distinction between “natural modes” and “pulsed modes” is achieved with the results obtained by the pulsed and unforced jet. Secondly, the correlation tensor is established with four parallel planes (multi-plane snapshot POD) for the evaluation of volume spatial modes. These resulting modes are interpolated and the volume velocity field is reconstructed with a minimal number of modes for all the times of the pulsation period. These reconstructions are compared to orthogonal measurements to the transverse jet in order to validate the obtained three-dimensional velocity fields. Finally, this POD approach for the 3D flow field reconstruction from experimental data issued from planes parallel to the flow seems capable to extract relevant information from a complex three-dimensional flow and can be an alternative to tomo-PIV for large volume of measurement.

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Acknowledgments

This work is funded partially by the 13th CPER and the ANR VIVE3D. Their supports are greatly acknowledged.

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Authors and Affiliations

  1. Laboratoire d’Etudes Aérodynamiques (LEA), Université de Poitiers, ENSMA, CNRS, SP2MI, Téléport 2, Boulevard Marie et Pierre Curie, BP 30179, 86962, Futuroscope Chasseneuil Cedex, France

    Romain Vernet, Lionel Thomas & Laurent David

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  1. Romain Vernet
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  2. Lionel Thomas
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  3. Laurent David
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Correspondence to Romain Vernet.

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Vernet, R., Thomas, L. & David, L. Analysis and reconstruction of a pulsed jet in crossflow by multi-plane snapshot POD. Exp Fluids 47, 707–720 (2009). https://doi.org/10.1007/s00348-009-0730-6

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  • DOI: https://doi.org/10.1007/s00348-009-0730-6

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