Comparison between two and three-dimensional POD in a turbulent boundary layer using multi-plane stereoscopic PIV

Alex Liberzon*, Roi Gurka, Gad Hetsroni

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

A comparison between two- and three-dimensional analyses using proper orthogonal decomposition (POD) is performed. The investigated flow field is a turbulent boundary layer in a flume. The decomposition is applied to the vorticity fields measured using a multi-plane stereoscopic particle image velocimetry (PIV) measurement system. The decomposition was applied using two methods: A) two-dimensional slices of the data that were used separately in a so-called slice-POD, and B) as a volumetric dataset that provides 3D-POD modes. Linear combination of the first three modes, energy distribution and reconstruction of snapshots are compared. Both decompositions capture most of the turbulent flow patterns; yet, the lower order modes show significant discrepancies between the slice-POD and 3D-POD. Therefore, in order to characterize coherent structures in turbulent flows, it is essential to perform both two- and three-dimensional decompositions. These two methods complement each other and can provide an improved interpretation of various flow features.

Original languageEnglish
Article number022010
JournalJournal of Physics: Conference Series
Volume318
Issue numberSECTION 2
DOIs
StatePublished - 2011
Event13th European Turbulence Conference, ETC13 - Warsaw, Poland
Duration: 12 Sep 201115 Sep 2011

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