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Flow organization in the wake of a rib in a turbulent boundary layer with pressure gradient
Univ Carlos III Madrid, Aerosp Engn Res Grp, Leganes, Spain..
Univ Carlos III Madrid, Aerosp Engn Res Grp, Leganes, Spain..
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-1663-3553
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-6570-5499
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2019 (English)In: Experimental Thermal and Fluid Science, ISSN 0894-1777, E-ISSN 1879-2286, Vol. 108, p. 115-124Article in journal (Refereed) Published
Abstract [en]

The effect of a streamwise pressure gradient on the wake developed by wall-attached square ribs in a turbulent boundary layer is investigated experimentally. Favourable-, adverse- and zero-pressure-gradient conditions (FPG, APG and ZPG, respectively) are reproduced at matched friction Reynolds number and non-dimensional rib height. Flow-field measurements are carried out by means of Particle Image Velocimetry (PIV). Turbulence statistics are extracted at high resolution using an Ensemble Particle Tracking Velocimetry approach. Modal analysis is performed with Proper Orthogonal Decomposition (POD). We demonstrate that a non-dimensional expression of the pressure gradient and shear stress is needed to quantify the pressure-gradient effects in the wake developing past wall-attached ribs. We suggest the Clauser pressure-gradient parameter beta, commonly used in the literature for the characterization of turbulent boundary layers under the effect of a pressure gradient, as a suitable parameter. The results show that, in presence of an adverse pressure gradient, the recirculation region downstream of the rib is increased in size, thus delaying the reattachment, and that the peak of turbulence intensity and the shed eddies are shifted towards larger wall-normal distances than in the ZPG case. The observed changes with respect to the ZPG configuration appear more intense for larger magnitude of beta, which are more likely to be obtained in APG than in FPG due to the reduced skin friction and increased displacement thickness.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE INC , 2019. Vol. 108, p. 115-124
Keywords [en]
Turbulent boundary layer, Pressure gradient flows, Ribs
National Category
Fluid Mechanics and Acoustics
Research subject
Applied and Computational Mathematics, Numerical Analysis
Identifiers
URN: urn:nbn:se:kth:diva-260990DOI: 10.1016/j.expthermflusci.2019.05.022ISI: 000484651400012Scopus ID: 2-s2.0-85068442439OAI: oai:DiVA.org:kth-260990DiVA, id: diva2:1357402
Note

QC 20191003

Available from: 2019-10-03 Created: 2019-10-03 Last updated: 2019-11-26Bibliographically approved

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Örlü, RamisVinuesa, RicardoSchlatter, Philipp

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MechanicsLinné Flow Center, FLOW
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