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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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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 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.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=1996, pages=14,
Title:Flow Field Decomposition Applied to Experimental Data Obtained for a Transitional Boundary Layer
Authors:
AuthorsInstitution or Email of Authors
Fischer, M.UNSPECIFIED
Wiegel, M.UNSPECIFIED
Herberg, T.UNSPECIFIED
Heiderich, G.UNSPECIFIED
Date:1996
Journal or Publication Title:Applied Scientific Research
Refereed publication:Yes
In ISI Web of Science:Yes
Publisher:Kluwer Academic Publishers, Editorial Department, P.O. Box 17, 3330 Dordrecht, The Netherlands
Status:Published
Keywords:Fundamental transition, Particle Image Velocimetry, Coherent structures, Proper Orthogonal Decomposition, Artificial Excitation
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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