High–Reynolds Number Wall Turbulence

Smits, Alexander J.; McKeon, Beverley; Marušić, Ivan

doi:10.1146/annurev-fluid-122109-160753

Cited by 794 publications

(651 citation statements)

References 138 publications

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“…On the assumption that the trapezoidal area is maintained, the change with the Reynolds number leads to the blue region in figure 15 changing to the red area, subject to λ min (y) remaining invariant. The consequence is then an increase in the plateau of u ′ u ′ and an extension of the logarithmic decline in u ′ u ′ , as observed by Smits et al 27 , Hultmark et al within the interval 2800 ≤ t + ≤ 3150. It is emphasized here that this is done merely in order to add support to the validity of the relationship between the plateau in the trapezoidal area in figure 14 and the logarithmic decline of u ′ u ′ + (y + ) in the meso-layer.…”

Section: B the Regime Of Attached Eddiesmentioning

confidence: 55%

Spectral analysis of near-wall turbulence in channel flow at Reτ=4200 with emphasis on the attached-eddy hypothesis

Agostini

Leschziner

2017

Phys. Rev. Fluids

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1 DNS data for channel flow at a friction Reynolds number of 4200, generated by Lozano-Durán & Jiménez (JFM, vol 759, 2014), are used to examine the properties of near-wall turbulence within sub-ranges of eddy-length scale. Attention is primarily focused on the intermediate layer ("meso-layer") covering the logarithmic velocity region within the range of wall-scaled wall-normal distance of 80-1500. The examination is based on a number of statistical properties, including pre-multiplied and compensated spectra, pre-multiplied derivative of the second-order structure function and three scalar parameters that characterise the anisotropic or isotropic state of the various length-scale sub-ranges. This analysis leads to the delineation of three regions within the map of wall-normal-wise pre-multiplied spectra, each characterized by distinct turbulence properties. A question of particular interest is whether the Townsend-Perry Attached Eddy Hypothesis (AEH) can be shown to be valid across the entire meso-layer, in contrast to the usual focus on the outer portion of the logarithmic-velocity layer at high Reynolds numbers, which is populated with very large-scale motions. This question is addressed by reference to properties in the pre-multiplied scale-wise derivative of the second-order structure function (PMDS2) and joint PDFs of streamwise-velocity fluctuations and their streamwise and spanwise derivatives. This examination provides evidence, based primarily on the existence of a plateau region in the PMDS2 for the qualified validity of the AEH right down the lower limit of the logarithmic velocity range.

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Section: B the Regime Of Attached Eddiesmentioning

confidence: 55%

Spectral analysis of near-wall turbulence in channel flow at Reτ=4200 with emphasis on the attached-eddy hypothesis

Agostini

Leschziner

2017

Phys. Rev. Fluids

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“…Many recent experimental results have suggested that the trend towards high Reynolds numbers could reveal some fundamentally different mechanisms at work in the dynamics of highReynolds-number boundary layers compared with their lower-Reynolds-number counterparts (see the reviews by Jiménez [53] and Smits et al [54]). Hutchins & Marusic [55] emphasized the occurrence of large structures whose size can reach up to 15 boundary layer thicknesses long.…”

Section: Further Discussion On Remaining Challenges and Closing Remarksmentioning

confidence: 99%

High-fidelity simulations of unsteady civil aircraft aerodynamics: stakes and perspectives. Application of zonal detached eddy simulation

Deck

Gand

Brunet

et al. 2014

Phil. Trans. R. Soc. A.

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This paper provides an up-to-date survey of the use of zonal detached eddy simulations (ZDES) for unsteady civil aircraft applications as a reflection on the stakes and perspectives of the use of hybrid methods in the framework of industrial aerodynamics. The issue of zonal or non-zonal treatment of turbulent flows for engineering applications is discussed. The ZDES method used in this article and based on a fluid problem-dependent zonalization is briefly presented. Some recent landmark achievements for conditions all over the flight envelope are presented, including low-speed (aeroacoustics of high-lift devices and landing gear), cruising (engine-airframe interactions), propulsive jets and off-design (transonic buffet and dive manoeuvres) applications. The implications of such results and remaining challenges in a more global framework are further discussed.

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“…This conjecture is consistent with the behaviour of the single-point turbulent kinetic energy source, s = − uv (dU/dy) − , which is displayed for three Reynolds numbers, Re τ = 550, Re τ = 950 and Re τ = 2000, in figure 4. From the plots the increasing share of the overlap layer to the total single-point energy source is apparent; see Smits, McKeon & Marusic (2011) for a review of the topic.…”

Section: Scale Energy and Scale-energy Sourcementioning

confidence: 99%

Cascades and wall-normal fluxes in turbulent channel flows

et al. 2016

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The present work describes the multidimensional behaviour of scale-energy production, transfer and dissipation in wall-bounded turbulent flows. This approach allows us to understand the cascade mechanisms by which scale energy is transmitted scale-by-scale among different regions of the flow. Two driving mechanisms are identified. A strong scale-energy source in the buffer layer related to the near-wall cycle and an outer scale-energy source associated with an outer turbulent cycle in the overlap layer. These two sourcing mechanisms lead to a complex redistribution of scale energy where spatially evolving reverse and forward cascades coexist. From a hierarchy of spanwise scales in the near-wall region generated through a reverse cascade and local turbulent generation processes, scale energy is transferred towards the bulk, flowing through the attached scales of motion, while among the detached scales it converges towards small scales, still ascending towards the channel centre. The attached scales of wall-bounded turbulence are then recognized to sustain a spatial reverse cascade process towards the bulk flow. On the other hand, the detached scales are involved in a direct forward cascade process that links the scale-energy excess at large attached scales with dissipation at the smaller scales of motion located further away from the wall. The unexpected behaviour of the fluxes and of the turbulent generation mechanisms may have strong repercussions on both theoretical and modelling approaches to wall turbulence. Indeed, actual turbulent flows are shown here to have a much richer physics with respect to the classical notion of turbulent cascade, where anisotropic production and inhomogeneous fluxes lead to a complex redistribution of energy where a spatial reverse cascade plays a central role.

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High–Reynolds Number Wall Turbulence

Cited by 794 publications

References 138 publications

Spectral analysis of near-wall turbulence in channel flow at Reτ=4200 with emphasis on the attached-eddy hypothesis

Spectral analysis of near-wall turbulence in channel flow at Reτ=4200 with emphasis on the attached-eddy hypothesis

High-fidelity simulations of unsteady civil aircraft aerodynamics: stakes and perspectives. Application of zonal detached eddy simulation

Cascades and wall-normal fluxes in turbulent channel flows

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