Wiegel, M. and Fischer, M. (1995) Proper orthogonal decomposition applied to PIV data for the oblique transition in a Blasius boundary layer. Optical Techniques in Fluid, Thermal, and Combustion Flow Part of SPIE's International Symposium on Optical Science, Engineering, and Instrumentation 9-14 July 1995, San Diego, CA, USA.
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Using experimental data from Particle Ima 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 eigenfunctins. 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 focus 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.
|Document Type:||Conference or Workshop Item (Paper)|
|Additional Information:||LIDO-Berichtsjahr=1995, pages=11,|
|Title:||Proper orthogonal decomposition applied to PIV data for the oblique transition in a Blasius boundary layer|
|Page Range:||pp. 87-97|
|Keywords:||coherent structures, Particle Image Velocimetry, Proper Orthogonal Decomposition, oblique transition, Blasius boundary layer|
|Event Title:||Optical Techniques in Fluid, Thermal, and Combustion Flow Part of SPIE's International Symposium on Optical Science, Engineering, and Instrumentation 9-14 July 1995, San Diego, CA, USA|
|HGF - Research field:||UNSPECIFIED|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||other|
|DLR - Research area:||UNSPECIFIED|
|DLR - Program:||L TG - Querschnittstechnologien|
|DLR - Research theme (Project):||UNSPECIFIED|
|Location:||Köln-Porz , Braunschweig , Göttingen|
|Institutes and Institutions:||Institute of Aerodynamics and Flow Technology > Institut für Strömungsmechanik > Institut für Experimentelle Strömungsmechanik|
|Deposited By:||elib DLR-Beauftragter|
|Deposited On:||03 Apr 2006|
|Last Modified:||27 Apr 2009 10:08|
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