Journal ArticleDOI
Turbulence spectra in smooth- and rough-wall pipe flow at extreme Reynolds numbers
TLDR
Del Alamo et al. as mentioned in this paper applied a semi-empirical correction to the experimental data to estimate how Taylor's frozen field hypothesis distorts the pseudo-spatial spectra inferred from time-resolved measurements.Abstract:
Well-resolved streamwise velocity spectra are reported for smooth- and rough-wall turbulent pipe flow over a large range of Reynolds numbers. The turbulence structure far from the wall is seen to be unaffected by the roughness, in accordance with Townsend’s Reynolds number similarity hypothesis. Moreover, the energy spectra within the turbulent wall region follow the classical inner and outer scaling behaviour. While an overlap region between the two scalings and the associated law are observed near , the behaviour is obfuscated at higher Reynolds numbers due to the evolving energy content of the large scales (the very-large-scale motions, or VLSMs). We apply a semi-empirical correction (del Alamo & Jimenez, J. Fluid Mech., vol. 640, 2009, pp. 5–26) to the experimental data to estimate how Taylor’s frozen field hypothesis distorts the pseudo-spatial spectra inferred from time-resolved measurements. While the correction tends to suppress the long wavelength peak in the logarithmic layer spectrum, the peak nonetheless appears to be a robust feature of pipe flow at high Reynolds number. The inertial subrange develops around where the characteristic region is evident, which, for high Reynolds numbers, persists in the wake and logarithmic regions. In the logarithmic region, the streamwise wavelength of the VLSM peak scales with distance from the wall, which is in contrast to boundary layers, where the superstructures have been shown to scale with boundary layer thickness throughout the entire shear layer. Moreover, the similarity in the streamwise wavelength scaling of the large- and very-large-scale motions supports the notion that the two are physically interdependent.read more
Citations
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Journal ArticleDOI
The Structure of Turbulent Shear Flow
TL;DR: The Structure of Turbulent Shear Flow by Dr. A.Townsend as mentioned in this paper is a well-known work in the field of fluid dynamics and has been used extensively in many applications.
Journal ArticleDOI
Direct numerical simulation of turbulent channel flow up to
Myoungkyu Lee,Robert D. Moser +1 more
TL;DR: In this paper, a direct numerical simulation of incompressible channel flow at a friction Reynolds number of 5186 has been performed, and the flow exhibits a number of the characteristics of high-Reynolds-number wall-bounded turbulent flows.
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Evolution of zero-pressure-gradient boundary layers from different tripping conditions
TL;DR: In this article, the spatial evolution of zero-pressure-gradient (ZPG) turbulent boundary layers from their origin to a canonical high-Reynolds-number state was studied through detailed streamwise velocity measurements using hot wires in the large University of Melbourne wind tunnel.
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Turbulent boundary layer statistics at very high Reynolds number
TL;DR: In this paper, the authors presented a unique investigation of boundary layer flow at very high Reynolds numbers, including mean velocities, streamwise turbulence variances, and moments up to 10th order.
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Self-similarity of wall-attached turbulence in boundary layers
TL;DR: In this paper, a spectral coherence analysis of the turbulent boundary layer flow structure is carried out through a spectrogram of two-point streamwise velocity signals at a near-wall reference position and a range of wall-normal positions spanning a Reynolds-number range.
References
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The Structure of Turbulent Shear Flow
TL;DR: In this paper, the authors present a method to find the optimal set of words for a given sentence in a sentence using the Bibliogr. Index Reference Record created on 2004-09-07, modified on 2016-08-08
Journal ArticleDOI
The structure of turbulent boundary layers
TL;DR: In this article, the authors describe the formation of low-speed streaks in the region very near the wall, which interact with the outer portions of the flow through a process of gradual lift-up, then sudden oscillation, bursting, and ejection.
Journal ArticleDOI
The Spectrum of Turbulence
Journal ArticleDOI
Evidence of very long meandering features in the logarithmic region of turbulent boundary layers
Nicholas Hutchins,Ivan Marusic +1 more
TL;DR: In this article, a publisher's version of an article published in Journal of Fluid Mechanics © 2007 Cambridge University Press, Cambridge, UK. www.cambridge.edu.org/
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Hairpin vortex organization in wall turbulencea)
TL;DR: The hairpin vortex paradigm of Theodorsen coupled with the quasistreamwise vortex paradigm have gained considerable support from multidimensional visualization using particle image velocimetry and direct numerical simulation experiments as discussed by the authors.
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