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Turbulent Boundary Layer Investigations with Conventional and Stereoscopic Particle Image Velocimetry

Kähler, Ch. and Willert, Ch. and Adrian, R.J. (1998) Turbulent Boundary Layer Investigations with Conventional and Stereoscopic Particle Image Velocimetry. In: 9th International Symposium on Applications of Laser Techniques to Fluid Mechanics, I, 11.1.1-11.1.8. 9th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lissabon/Portugal, 13.-16. Juli 1998.

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Abstract

Stereoscopic PIV (SPIV) measurements from an artificially tripped boundary layer flow along a flat plate with zero pressure gradient are presented to demonstrate the power of SPIV in turbulence research. The components of the double correlation tensor of fluctuating velocities are calculated in stream-wise span-wise planes at three vertical locations (y=220, 100, 30) to deduce the average dimensions of the dominant flow structures. A side from this statistical approach, instantaneous velocity fields are examined in order to retrieve the contribution of the various flow structures to the Reynolds stress and their significance for existing vortex models. The shape, extent and spatial distribution of slightly twisted low-speed streaks is clearly visible and in quantitative agreement with experimental and numerical results. However, the distribution of the out-of plane motions shows that no pairs of long stream-wise counter-rotating vortices flank the low speed regions. Furthermore, it seems that the outward migration of low momentum fluid is a result of an interaction between high and low speed fluids.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1999, monograph_id=Paper 11.1,
Title:Turbulent Boundary Layer Investigations with Conventional and Stereoscopic Particle Image Velocimetry
Authors:
AuthorsInstitution or Email of Authors
Kähler, Ch.UNSPECIFIED
Willert, Ch.UNSPECIFIED
Adrian, R.J.Department for Theoretical and Applied Mechanics, University of Illinois, Urbana
Date:1998
Journal or Publication Title:9th International Symposium on Applications of Laser Techniques to Fluid Mechanics
Volume:I
Page Range:11.1.1-11.1.8
Editors:
EditorsEmail
Instituto Superior Tecnico Department of Mechanical Engineering Av. Rovisco Pais, 1096 Lisboa Codex PortugalUNSPECIFIED
Status:Published
Keywords:Turbulent Boundary Layer, Stereoscopic PIV, correlation tensor, dominant flow structures, Reynolds stress, vortex models, low-speed streaks, stream-wise, vortices
Event Title:9th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lissabon/Portugal, 13.-16. Juli 1998
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L SI - Versuchs- und Simulationstechniken
DLR - Research theme (Project):UNSPECIFIED
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Strömungsmechanik
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 20:25

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