Decomposition of time-resolved tomographic PIV

Peter Schmid; D. Violato; Fulvio Scarano

Decomposition of time-resolved tomographic PIV

Peter Schmid ^{1, *} D. Violato ² Fulvio Scarano ²

* Corresponding author

2 Department of Aerospace Engineering [Delft]

Abstract : An experimental study has been conducted on a transitional water jet at a Reynolds number of Re = 5,000. Flow fields have been obtained by means of time-resolved tomographic particle image velocimetry capturing all relevant spatial and temporal scales. The measured three-dimensional flow fields have then been postprocessed by the dynamic mode decomposition which identifies coherent structures that contribute significantly to the dynamics of the jet. Both temporal and spatial analyses have been performed. Where the jet exhibits a primary axisymmetric instability followed by a pairing of the vortex rings, dominant dynamic modes have been extracted together with their amplitude distribution. These modes represent a basis for the low-dimensional description of the dominant flow features. © 2012 Springer-Verlag.

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https://hal-polytechnique.archives-ouvertes.fr/hal-00994473
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Submitted on : Monday, May 26, 2014 - 2:40:22 PM
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Decomposition of time-resolved tomographic PIV

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Decomposition of time-resolved tomographic PIV

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