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Tracking of Vortices in a Turbulent Boundary Layer

Elsinga, Gerrit and Poelma, Christian and Westerweel, Jerry and Schröder, Andreas and Geisler, Reinhard and Scarano, Fulvio (2011) Tracking of Vortices in a Turbulent Boundary Layer. Seventh International Symposium on Turbulence and Shear Flow Phenomena (TSFP-7), 28. - 31. Jul. 2011, Ottawa, Canada.

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Official URL: http://www.tsfp7.org/index.php


The motion of spanwise vortical elements has been tracked in the outer region between wall-normal distance z/δ = 0.11 and 0.30 of a turbulent boundary layer at Reθ = 2460. The experimental dataset of time-resolved threedimensional velocity fields used has been obtained by tomographic particle image velocimetry. The tracking of these structures yields their respective average trajectories as well as the variations thereof, quantified by the root-mean-square of the trajectory coordinates as a function of time. It is demonstrated that the variation in convection can be described by a dispersion model for infinitesimal particles in homogeneous turbulence, which suggests that these vortical structures are transported passively by the external velocity field without significant changes in their topology, at least over the present observation time of 1.2δ/Ue. It is shown that the measured variation in convection velocity can further be used successfully to predict the temporal development of space-time correlation functions starting from the instantaneous correlation map. In this prediction the structures are assumed to convect without change, following our observations.

Item URL in elib:https://elib.dlr.de/65957/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Tracking of Vortices in a Turbulent Boundary Layer
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Elsinga, GerritDelft University of Technology, NLUNSPECIFIED
Poelma, ChristianDelft University of Technology, NLUNSPECIFIED
Westerweel, JerryDelft University of Technology, NLUNSPECIFIED
Scarano, FulvioDelft University of Technology, NLUNSPECIFIED
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-6
Series Name:Conference Proceedings online
Keywords:turbulent boundary layer, space-time correlation
Event Title:Seventh International Symposium on Turbulence and Shear Flow Phenomena (TSFP-7)
Event Location:Ottawa, Canada
Event Type:international Conference
Event Dates:28. - 31. Jul. 2011
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Micknaus, Ilka
Deposited On:14 Sep 2011 16:20
Last Modified:15 Dec 2011 15:21

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