Flow Field Decomposition Applied to Experimental Data Obtained for a Transitional Boundary Layer
Fischer, M. and Wiegel, M. and Herberg, T. and Heiderich, G. (1996) Flow Field Decomposition Applied to Experimental Data Obtained for a Transitional Boundary Layer. Applied Scientific Research. Kluwer Academic Publishers, Editorial Department, P.O. Box 17, 3330 Dordrecht, The Netherlands.
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Using experimental data from Particle Image Velocimetry (PIV) measurements, coherent structures of a transitional spatially developing boundary layer are determined. The coherent structures are determined utilizing the Proper Orthogonal Decomposition (POD), which is based on an expansion of the flow field variables into a set of eigenfunctions or modes. For having constant and reproducible flow field conditions, the flow is artificially excited by means of periodic velocity fluctuations. The used excitation device allows the generation of different transition scenarios, where this paper focuses on the case of the fundamental transition. Phase locked excitation signals allow the recording of instantaneous velocity fields of the flow field at certain instants of time. It can be shownthat PIV is a suitable technique to provide experimental data for POD. The results of the POD show that already a small number of modescover most of the kinetic energy of the flow.
|Additional Information:||LIDO-Berichtsjahr=1996, pages=14,|
|Title:||Flow Field Decomposition Applied to Experimental Data Obtained for a Transitional Boundary Layer|
|Journal or Publication Title:||Applied Scientific Research|
|In ISI Web of Science:||Yes|
|Publisher:||Kluwer Academic Publishers, Editorial Department, P.O. Box 17, 3330 Dordrecht, The Netherlands|
|Keywords:||Fundamental transition, Particle Image Velocimetry, Coherent structures, Proper Orthogonal Decomposition, Artificial Excitation|
|HGF - Research field:||UNSPECIFIED|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L - no assignement|
|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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