TY - JOUR
T1 - Comparison between two and three-dimensional POD in a turbulent boundary layer using multi-plane stereoscopic PIV
AU - Liberzon, Alex
AU - Gurka, Roi
AU - Hetsroni, Gad
PY - 2011
Y1 - 2011
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84856316213&partnerID=8YFLogxK
U2 - 10.1088/1742-6596/318/2/022010
DO - 10.1088/1742-6596/318/2/022010
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AN - SCOPUS:84856316213
SN - 1742-6588
VL - 318
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - SECTION 2
M1 - 022010
T2 - 13th European Turbulence Conference, ETC13
Y2 - 12 September 2011 through 15 September 2011
ER -