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Experimental Investigation of the Log-Law for an Adverse Pressure Gradient Turbulent Boundary Layer Flow at Reθ = 10000

Knopp, Tobias and Schanz, Daniel and Schröder, Andreas and Dumitra, Michnea and Cierpka, Christian and Hain, R. and Kähler, Christian (2014) Experimental Investigation of the Log-Law for an Adverse Pressure Gradient Turbulent Boundary Layer Flow at Reθ = 10000. Flow Turbulence and Combustion, 92 (1-2), pp. 451-471. Springer. DOI: 10.1007/s10494-013-9479-3 ISSN 1386-6184

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Official URL: http://link.springer.com/article/10.1007%2Fs10494-013-9479-3#

Abstract

We present an experimental investigation of a turbulent boundary layer flow at a significant adverse pressure gradient at Reynolds number Re-theta=10000 using large field PIV. The testcase is designed to start from a zero pressure gradient flow at Re-theta= 8000 with a distinct log-law region following a slowly rising adverse pressure gradient. This allows to reveal a breakdown of the log-law under the effect of the adverse pressure gradient. The region described by the log-law is progressively reduced in terms of y+ and then joins into a modified log-law which gives a good fit to the data up to at least y/delta99= 0.2. The scaling in the overlap region is demonstrated using the mean velocity slope diagnostic function, enabled due to the high quality of the PIV data. Locally, the velocity profile is measured down to the wall using long-range microscopic PIV with a particle tracking velocimetry to determine the wall shear stress directly in the adverse pressure gradient region.

Item URL in elib:https://elib.dlr.de/85000/
Document Type:Article
Additional Information:Published online: 29. Juni 2013
Title:Experimental Investigation of the Log-Law for an Adverse Pressure Gradient Turbulent Boundary Layer Flow at Reθ = 10000
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Knopp, Tobiastobias.knopp (at) dlr.deUNSPECIFIED
Schanz, Danieldaniel.schanz (at) dlr.deUNSPECIFIED
Schröder, Andreasandreas.schroeder (at) dlr.deUNSPECIFIED
Dumitra, MichneaUniBw MünchenUNSPECIFIED
Cierpka, ChristianUniBW MünchenUNSPECIFIED
Hain, R.UniBW MünchenUNSPECIFIED
Kähler, ChristianUniBw MünchenUNSPECIFIED
Date:2014
Journal or Publication Title:Flow Turbulence and Combustion
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:92
DOI :10.1007/s10494-013-9479-3
Page Range:pp. 451-471
Publisher:Springer
ISSN:1386-6184
Status:Published
Keywords:Turbulent boundary layer · Adverse pressure gradient · PIV · Log-law · Scaling law
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 - Simulation & Validation (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > C²A²S²E - Center for Computer Applications in AeroSpace Science and Engineering
Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Micknaus, Ilka
Deposited On:25 Apr 2014 10:34
Last Modified:10 Jan 2019 15:52

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