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Experimental evidence of near-wall reverse flow events in a zero pressure gradient turbulent boundary layer

Willert, Christian and Cuvier, Christoph and Foucaut, Jean-Marc and Klinner, Joachim and Stanislas, Michel and Laval, Jean-Philippe and Srinath, S. and Soria, Julio and Amili, Omid and Atkinson, Callum and Kähler, Christian and Scharnowski, Sven and Hain, Rainer and Schröder, Andreas and Geisler, Reinhard and Agocs, Janos and Röse, Anni (2017) Experimental evidence of near-wall reverse flow events in a zero pressure gradient turbulent boundary layer. Experimental Thermal and Fluid Science, 91, pp. 320-328. Elsevier. DOI: 10.1016/j.expthermflusci.2017.10.033 ISSN 0894-1777

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Official URL: https://doi.org/10.1016/j.expthermflusci.2017.10.033

Abstract

This study reports on experimentally observed rare near-wall reverse flow events in a fully developed turbulent flat plate boundary layer at zero pressure gradient with Reynolds numbers between Re_\theta \approx 2500 and Re_\theta \approx 8000 (Re_\tau = 800-2400). The reverse flow events are captured using high magnification particle image velocimetry sequences with record lengths varying from 50 000 to 126 000 samples. Time resolved particle image sequences allow singular reverse flow events to be followed over several time steps whereas long records of nearly statistically independent samples provide a variety of single snapshots at a higher spatial resolution. The probability of occurrence lies in the order of 0.012-0.018% which matches predictions from direct numerical simulations (DNS). The typical size of the reverse flow bubble is about 30 wall units in length and 5 wall units in height which agrees well with similar observations made in existing DNS data.

Item URL in elib:https://elib.dlr.de/114923/
Document Type:Article
Title:Experimental evidence of near-wall reverse flow events in a zero pressure gradient turbulent boundary layer
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Willert, ChristianChris.Willert (at) dlr.dehttps://orcid.org/0000-0002-1668-0181
Cuvier, Christophlml umr cnrs 8107, villeneuve d'ascq, franceUNSPECIFIED
Foucaut, Jean-Marcuniversité lille nord de france, lml-laboratoire de mécanique de lille, lille, franceUNSPECIFIED
Klinner, Joachimjoachim.klinner (at) dlr.dehttps://orcid.org/0000-0003-2709-9664
Stanislas, Michellaboratoire de mécanique de lille, franceUNSPECIFIED
Laval, Jean-Philippelml umr cnrs 8107, villeneuve d'ascq, franceUNSPECIFIED
Srinath, S.lml umr cnrs 8107, villeneuve d'ascq, franceUNSPECIFIED
Soria, Juliomonash universityhttps://orcid.org/0000-0002-7089-9686
Amili, Omidmonash universityUNSPECIFIED
Atkinson, Callummonash universityhttps://orcid.org/0000-0003-3726-2103
Kähler, Christianunibw münchenUNSPECIFIED
Scharnowski, Svenuni bw münchenUNSPECIFIED
Hain, Raineruni bw münchen, inst f strömungsmechanik und aerodynamikUNSPECIFIED
Schröder, Andreasandreas.schroeder (at) dlr.dehttps://orcid.org/0000-0002-6971-9262
Geisler, Reinhardreinhard.geisler (at) dlr.deUNSPECIFIED
Agocs, Janosjanos.agocs (at) dlr.deUNSPECIFIED
Röse, Annias-exvUNSPECIFIED
Date:November 2017
Journal or Publication Title:Experimental Thermal and Fluid Science
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:91
DOI :10.1016/j.expthermflusci.2017.10.033
Page Range:pp. 320-328
Publisher:Elsevier
ISSN:0894-1777
Status:Published
Keywords:Particle image velocimetry Turbulence statistics Boundary layer Flow reversal Wall shear stress
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation methods, L - Simulation and Validation
Location: Göttingen , Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Measurement Systems
Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Willert, Dr.phil. Christian
Deposited On:14 Dec 2017 09:11
Last Modified:06 Sep 2019 15:25

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