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Proceedings Paper

Proper orthogonal decomposition applied to PIV data for the oblique transition in a Blasius boundary layer
Author(s): Markus Wiegel; Markus Fischer
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Paper Abstract

Using experimental data from Particle Image Velocimetry (PIV) measurements, coherent structures of a transitional, spatially developing boundary layer are determined. The coherent structures are calculated utilizing the Proper Orthogonal Decomposition (POD), which is based on an expansion of the flow field variables into so-called Karhunen-Loeve eigenfunctions. To get reproducible flow conditions we excite the flow with controlled disturbances by means of periodic velocity fluctuations. We are able to introduce two- and three- dimensional traveling waves. Therefore it is possible to investigate different transition scenarios. This paper focuses on the oblique transition. Phase locked signals allows to record the flow field at certain instants of time. We can show that PIV is a suitable technique to provide experimental data for POD. The POD shows that already a small number of modes cover most of the energy.

Paper Details

Date Published: 29 September 1995
PDF: 11 pages
Proc. SPIE 2546, Optical Techniques in Fluid, Thermal, and Combustion Flow, (29 September 1995); doi: 10.1117/12.221512
Show Author Affiliations
Markus Wiegel, DLR (Germany)
Markus Fischer, DLR (Germany)

Published in SPIE Proceedings Vol. 2546:
Optical Techniques in Fluid, Thermal, and Combustion Flow
Soyoung Stephen Cha; James D. Trolinger, Editor(s)

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