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Spatial characteristics of a zero-pressure-gradient turbulent boundary layer in the presence of free-stream turbulence
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
Univ Southampton, Engn & Environm, Southampton SO17 1BJ, Hants, England.;Norwegian Univ Sci & Technol, Dept Energy & Proc Engn, NO-7491 Trondheim, Norway..
Univ Southampton, Engn & Environm, Southampton SO17 1BJ, Hants, England.;York Univ, Dept Mech Engn, Toronto, ON M3J 1P3, Canada..
Univ Southampton, Engn & Environm, Southampton SO17 1BJ, Hants, England..
2019 (English)In: Physical Review Fluids, E-ISSN 2469-990X, Vol. 4, no 8, article id 084601Article in journal (Refereed) Published
Abstract [en]

Particle image velocimetry (PIV) measurements are performed to examine the structural organization inside a turbulent boundary layer under the influence of free-stream turbulence (FST). In particular, streamwise-wall-normal plane PIV measurements are presented for two cases at two different turbulent intensity levels (about 13% and 8%). The free-stream turbulence is generated using an active grid in a wind tunnel. The statistical information of the flow regarding the wall-normal velocity and Reynolds shear stress are presented. The effect of increasing the turbulence level in the free stream for these flows has been found to have similarities with increasing Reynolds number for high-Reynolds-number canonical flows. Quadrant analysis is performed to determine the contributions of different Reynolds-stress-producing events. In this regard, the distribution of momentum transport events shows some similarity with channel flows, which can be justified by comparison of similar intermittency characteristics of both flows. In addition, the coherent structures found inside the boundary layer have inclined features that are consistent with the previous studies for canonical flows. The fact that the external disturbance, such as FST in this study, does not alter the organization of the structures inside the boundary layer supports the growing evidence for a universal structure for wall-bounded flows.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 4, no 8, article id 084601
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-256263DOI: 10.1103/PhysRevFluids.4.084601ISI: 000478049200001Scopus ID: 2-s2.0-85072054732OAI: oai:DiVA.org:kth-256263DiVA, id: diva2:1365815
Note

QC 20191025

Available from: 2019-10-25 Created: 2019-10-25 Last updated: 2019-10-25Bibliographically approved

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