Decomposition of time-resolved tomographic PIV

Peter J. Schmid 1 D. Violato 2 O. Pust 3 F. Scarano 2
1 LadHyX - Laboratoire d'hydrodynamique
2 Department of Aerospace Engineering
3 Dantec Dynamics
Abstract : An experimental study has been conducted on a transitional water jet at a Reynolds number of Re = 5000. Flow fields have been obtained by means of time-resolved tomographic particle image velocimetry (TR-TOMO PIV) capturing all relevant spatial and temporal scales. The measured three-dimensional flow fields have then been postprocessed by the dynamic mode decomposition (DMD) which identifies coherent structures that contribute significantly to the dynamics of the jet. 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.
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Communication dans un congrès
15th International Symposium on Applications of Laser Techniques in Fluid Mechanics, Jul 2010, Lisbonne, Portugal. Instituto Superior Técnico Center for Innovation, Technology and Policy Research, pp.3.7.1, 2010
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Peter J. Schmid, D. Violato, O. Pust, F. Scarano. Decomposition of time-resolved tomographic PIV. 15th International Symposium on Applications of Laser Techniques in Fluid Mechanics, Jul 2010, Lisbonne, Portugal. Instituto Superior Técnico Center for Innovation, Technology and Policy Research, pp.3.7.1, 2010. 〈hal-01052852〉

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