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Uniform momentum zones in adverse pressure gradient turbulent boundary layer

Thavamani, Aswin and Cuvier, Christophe and Willert, Christian and Foucaut, Jean Marc and Atkinson, Callum and Soria, Julio (2020) Uniform momentum zones in adverse pressure gradient turbulent boundary layer. Experimental Thermal and Fluid Science, 115, p. 110080. Elsevier. doi: 10.1016/j.expthermflusci.2020.110080. ISSN 0894-1777.

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Official URL: https://doi.org/10.1016/j.expthermflusci.2020.110080

Abstract

Uniform momentum zones (UMZs) for an adverse pressure gradient turbulent boundary layer (APG-TBL) are characterised in this paper. The database described by Cuvier et al. [2017], which was obtained using 2-component 2-dimensional (2C-2D) particle image velocimetry (PIV) at two free-stream velocities of 5 m/s and 9 m/s, is used for this study. The methodology described by Adrian et al. [2000] is used to identify and hence, statistically characterise the UMZs and UMZ interfaces in the APG-TBL. This study shows that the number of detected UMZs increases in the streamwise direction for both free-stream velocities. This increase is primarily thought to be due to the adverse pressure gradient (APG) since a comparison of the results between the two free-stream velocity APG-TBLs did not show any statistically significant difference with Re_\theta for the range of Reynolds number examined in this study. The thickness of the UMZs, \delta w and the jump in streamwise velocity across the UMZ interface were found to increase in the wall-normal direction, whereas the width of the UMZ interface, \delta u, was found to decrease. The number of UMZs, N_umz, identified appeared to influence the modal velocities/uniform velocities, geometrical properties of the UMZs and statistics of the flow. With increasing N_umz, the modal velocities of the UMZs moved to higher values to accommodate new UMZs that developed closer to the wall and the thickness of each UMZ and \delta u across the UMZ interface decreased, whereas \delta w increased. A slight difference in the magnitude of streamwise Reynolds stress and Reynolds shear stress was observed in the inner and outer regions, and a slight difference in the magnitude of turbulence production was also observed in the inner region between the velocity fields having a low or high number of UMZs indicating that the flow statistics are influenced by the number of UMZs present in the APG-TBL.

Item URL in elib:https://elib.dlr.de/134219/
Document Type:Article
Title:Uniform momentum zones in adverse pressure gradient turbulent boundary layer
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Thavamani, AswinMonash UniversityUNSPECIFIED
Cuvier, ChristopheUniv. Lille, CNRS, ONERA, Arts et Metiers Institute of Technology, Centrale Lille, UMR 9014 - LMFLUNSPECIFIED
Willert, ChristianChris.Willert (at) dlr.dehttps://orcid.org/0000-0002-1668-0181
Foucaut, Jean MarcUniv. Lille, CNRS, ONERA, Arts et Metiers Institute of Technology, Centrale Lille, UMR 9014 - LMFLhttps://orcid.org/0000-0003-0800-8608
Atkinson, CallumMonash Universityhttps://orcid.org/0000-0003-3726-2103
Soria, JulioMonash Universityhttps://orcid.org/0000-0002-7089-9686
Date:2020
Journal or Publication Title:Experimental Thermal and Fluid Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:115
DOI :10.1016/j.expthermflusci.2020.110080
Page Range:p. 110080
Publisher:Elsevier
ISSN:0894-1777
Status:Published
Keywords:uniform momentum zones; turbulent boundary layer; adverse pressure gradient; particle image velocimetry; PIV
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 (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Willert, Dr.phil. Christian
Deposited On:26 Oct 2020 09:56
Last Modified:26 Oct 2020 09:56

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