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Experimental realis...
Experimental realisation of near-equilibrium adverse-pressure-gradient turbulent boundary layers
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Sanmiguel Vila, C. (author)
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- Vinuesa, Ricardo (author)
- KTH,Linné Flow Center, FLOW,Strömningsmekanik och Teknisk Akustik
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Discetti, S. (author)
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Ianiro, A. (author)
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- Schlatter, Philipp (author)
- KTH,Linné Flow Center, FLOW,Strömningsmekanik och Teknisk Akustik
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- Örlü, Ramis, 1977- (author)
- KTH,Linné Flow Center, FLOW,Strömningsmekanik och Teknisk Akustik
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(creator_code:org_t)
- Elsevier Inc. 2020
- 2020
- English.
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In: Experimental Thermal and Fluid Science. - : Elsevier Inc.. - 0894-1777 .- 1879-2286. ; 112
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- A new experimental database of adverse-pressure-gradient (APG) turbulent boundary layers (TBLs) obtained through hot-wire anemometry and oil-film interferometry covering a momentum–loss Reynolds number 450<Reθ<23450 and Clauser pressure-gradient-parameter range up to β≈2.4 is presented. Both increasing and approximately constant β distributions with the same upstream history are characterised. Turbulence statistics are compared among the different pressure-gradient distributions with additional numerical and experimental zero-pressure-gradient (ZPG) TBL data. Cases at approximately constant β, which can be considered as canonical representations of the boundary layer under a certain pressure-gradient magnitude, exhibit skin-friction and shape-factor curves consistent with the ones proposed by Vinuesa et al. (2017). These curves show a similar scaling behaviour as those proposed by Nagib et al. (2007) for ZPG TBLs. The pre-multiplied power-spectral density is employed to study the differences in the large-scale energy content throughout the boundary layer. Two different large-scale phenomena are identified, the first one related to the pressure gradient and the second one (also present in high-Re ZPG TBLs) due to the Reynolds number. Recently proposed scaling laws by Kitsios et al. (2016) and Maciel et al. (2018) are tested over a wider Reynolds-number range and for different β cases. The mean velocity and streamwise velocity fluctuation profiles are found to be dependent on the upstream development. The mean velocity profile is found to be self-similar only in the outer region, in agreement with classical theory. The mean and higher-order statistics of the new APG TBL database are made available under www.flow.kth.se.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Keyword
- Pressure gradient flows
- Turbulent boundary layer
- Turbulent flows
- Boundary layer flow
- Boundary layers
- Higher order statistics
- Pressure gradient
- Reynolds number
- Spectral density
- Turbulence
- Turbulent flow
- Adverse pressure gradient
- Canonical representations
- Mean velocity profiles
- Oil film interferometries
- Pressure-gradient parameters
- Stream-wise velocities
- Turbulent boundary layers
- Zero pressure gradient
- Atmospheric thermodynamics
Publication and Content Type
- ref (subject category)
- art (subject category)
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