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Pressure statistics and their scaling in high-Reynolds-number turbulent boundary layers
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0002-3251-8328
KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Physics.ORCID iD: 0000-0002-1146-3241
KTH, School of Engineering Sciences (SCI), Mechanics, Turbulence.ORCID iD: 0000-0002-2711-4687
2007 (English)In: Journal of Fluid Mechanics, ISSN 0022-1120, E-ISSN 1469-7645, Vol. 585, 1-40 p.Article in journal (Refereed) Published
Abstract [en]

Pressure fluctuations are an important ingredient in turbulence, e.g. in the pressure strain terms which redistribute turbulence among the different fluctuating velocity components. The variation of the pressure fluctuations inside a turbulent boundary layer has hitherto been out of reach of experimental determination. The mechanisms of non-local pressure-related coupling between the different regions of the boundary layer have therefore remained poorly understood. One reason for this is the difficulty inherent in measuring the fluctuating pressure. We have developed a new technique to measure pressure fluctuations. In the present study, both mean and fluctuating pressure, wall pressure, and streamwise velocity have been measured simultaneously in turbulent boundary layers up to Reynolds numbers based on the momentum thickness R-theta similar or equal to 20 000. Results on mean and fluctuation distributions, spectra, Reynolds number dependence, and correlation functions are reported. Also, an attempt is made to test, for the first time, the existence of Kolmogorov's -7/3 power-law scaling of the pressure spectrum in the limit of high Reynolds numbers in a turbulent boundary layer.

Place, publisher, year, edition, pages
2007. Vol. 585, 1-40 p.
Keyword [en]
locally isotropic turbulence, direct numerical-simulation, wall-pressure, channel flow, vortical structures, coherent structures, overlap region, small scales, shear-flow, pipe-flow
URN: urn:nbn:se:kth:diva-16907DOI: 10.1017/s0022112007006076ISI: 000249080200001ScopusID: 2-s2.0-34547753445OAI: diva2:334950
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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Fransson, Jens H. M.Alfredsson, P. HenrikJohansson, Arne V.
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