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Utilizing indicator functions with computational data to confirm nature of overlap in normal turbulent stresses: Logarithmic or quarter-power
ILLINOIS TECH (I.I.T), Chicago, Illinois 60616, USA.
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Fluid Mechanics.ORCID iD: 0000-0001-6570-5499
Instituto Universitario de Matemática Pura y Aplicada, Universitat Politècnica de València, Valencia 46022, Spain.
2024 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 36, no 7, article id 075145Article in journal (Refereed) Published
Abstract [en]

Indicator functions of the streamwise normal-stress profiles (NSP), based on careful differentiation of some of the best direct numerical simulations (DNS) data from channel and pipe flows, over the range 550 < R e τ < 16 000 , are examined to establish the existence and range in wall distances of either a logarithmic-trend segment or a 1/4-power region. For nine out of 15 cases of DNS data we examined where R e τ < 2000 , the NSP did not contain either of the proposed trends. As R e τ exceeds around 2000 a 1/4-power, reflecting the “bounded-dissipation” predictions of Chen and Sreenivasan [“Law of bounded dissipation and its consequences in turbulent wall flows,” J. Fluid Mech. 933, A20 (2022); “Reynolds number asymptotics of wall-turbulence fluctuations,” J. Fluid Mech. 976, A21 (2023)] and data analysis of Monkewitz [“Reynolds number scaling and inner-outer overlap of stream-wise Reynoldss stress in wall turbulence,” arXiv:2307.00612 (2023)], develops near y + = 1000 and expands with Reynolds numbers extending to 1000 < y + < 10 000 for R e τ around 15 000. This range of 1/4-power NSP corresponds to a range of outer-scaled Y between around 0.3 and 0.7. The computational database examined did not include the zero-pressure-gradient boundary layer experiments at higher Reynolds numbers where the logarithmic trend in the NSP has been previously reported around y+ of 1000 by Marusic et al. [“Attached eddy model of wall turbulence,” Annu. Rev. Fluid Mech. 51, 49-74 (2019); “The logarithmic variance of streamwise velocity and conundrum in wall turbulence,” J. Fluid Mech. 933, A8 (2022)] according to a “wall-scaled eddy model.”

Place, publisher, year, edition, pages
AIP Publishing , 2024. Vol. 36, no 7, article id 075145
National Category
Fluid Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-350948DOI: 10.1063/5.0219031ISI: 001283675600004Scopus ID: 2-s2.0-85198907099OAI: oai:DiVA.org:kth-350948DiVA, id: diva2:1885623
Note

QC 20240725

Available from: 2024-07-24 Created: 2024-07-24 Last updated: 2025-02-09Bibliographically approved

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Vinuesa, Ricardo

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