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Experimental Evidence of Near-Wall Reverse Flow Events in a Zero Pressure Gradient Turbulent Boundary Layer

Willert, Christian (2015) Experimental Evidence of Near-Wall Reverse Flow Events in a Zero Pressure Gradient Turbulent Boundary Layer. Cornell University Library. [Other]

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Official URL: http://arxiv.org/abs/1507.00609

Abstract

This study reports on experimentally observed near-wall reverse flow events in a fully developed flat plate boundary layer at zero pressure gradient with Reynolds numbers between Re\tau = 1000 and Re\tau = 2700. 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 range of 0.01% to 0.1% which matches predictions made with direct numerical simulations (DNS). The self-similar size of the reverse flow bubble is about 30-50 wall units in length and 5 wall units in height which also agrees well to DNS data provided by Lenaers et al. (Phys.Fluids 24:035110 (2012)).

Item URL in elib:https://elib.dlr.de/97112/
Document Type:Other
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.deUNSPECIFIED
Date:2 July 2015
Journal or Publication Title:arXiv
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:8
Publisher:Cornell University Library
Series Name:physics.flu-dyn
Status:Published
Keywords:particle image velocimetry, turbulence statistics, boundary layer, flow reversal, wall shear stress, PIV, visualization, near-wall turbulence
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
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Willert, Dr.phil. Christian
Deposited On:16 Jul 2015 10:07
Last Modified:31 Jul 2019 19:53

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