Turbulent boundary layers up to Reθ=2500 studied through simulation and experiment

Schlatter, Philipp; Örlü, Ramis; Li, Q.; Brethouwer, Geert; Fransson, Jens H. M.; Johansson, A.; Alfredsson, P. Henrik; Henningson, Dan S.

doi:10.1063/1.3139294

Cited by 239 publications

(221 citation statements)

References 20 publications

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“…Since the relative averaging error is only due to Erm & Joubert (1991), and from simulations at roughly similar Reynolds numbers. The agreement is excellent, especially with the experiments, and with the simulations of Schlatter et al (2009) below y/S 99 «0.6. The minor discrepancies between the intensities of Spalart (1988), both with the present results and with the experiments, cannot be attributed to the Reynolds number difference, and are presumably a consequence of the mean-flow expansion used by him to approximate the flow, although the recent note by Spalart, Coleman & Johnstone (2009) suggests that their resolution was also slightly too coarse.…”

Section: Basic Statisticssupporting

confidence: 71%

“…The figure also displays the segments used to average the statistics of the three reference sections used later in the paper, listed in Erm & Joubert (1991), Reg = 1450 for the present simulation, Reg = 1430 for de Graaff & Eaton (2000), and Reg = 1410 for Schlatter et al (2009).…”

Section: Basic Statisticsmentioning

confidence: 99%

“…Figure 11 is drawn for Reynolds numbers beyond Re e = 1400 and has presumably lost any transitional order it may have had. Our simulation bypasses transition, and would therefore probably be everywhere different from Wu & Moin (2009), but the newer one by Schlatter et al (2009) On the other hand, it is plausible that, even if the small-scale vortices are disorganized, some organization could be recovered for the larger-scale eddies, in the same way as a self-similar geometry was recovered for the vortex clusters in del Alamo et al (2006) and Flores et al (2007). It is already clear from figure 11 that the vortices are arranged in large streamwise streaks, about one boundarylayer thickness wide, knotting into ejections every few boundary-layer thicknesses, in agreement with the spectra of the velocities.…”

Section: The Geometry Of the Vortical Structuresmentioning

confidence: 99%

“…•, (Schlatter et al 2009). Experimental boundary layers: V (Schewe 1983); A (Farabee & Casarella 1991); D (Tsuji et al 2007).…”

Section: Basic Statisticsmentioning

confidence: 99%

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Turbulent boundary layers and channels at moderate Reynolds numbers

et al. 2010

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The behaviour of the velocity and pressure fluctuations in the outer layers of wall-bounded turbulent flows is analysed by comparing a new simulation of the zero-pressure-gradient boundary layer with older simulations of channels. The 99 % boundary-layer thickness is used as a reasonable analogue of the channel half-width, but the two flows are found to be too different for the analogy to be complete. In agreement with previous results, it is found that the fluctuations of the transverse velocities and of the pressure are stronger in the boundary layer, and this is traced to the pressure fluctuations induced in the outer intermittent layer by the differences between the potential and rotational flow regions. The same effect is also shown to be responsible for the stronger wake component of the mean velocity profile in external flows, whose increased energy production is the ultimate reason for the stronger fluctuations. Contrary to some previous results by our group, and by others, the streamwise velocity fluctuations are also found to be higher in boundary layers, although the effect is weaker. Within the limitations of the non-parallel nature of the boundary layer, the wall-parallel scales of all the fluctuations are similar in both the flows, suggesting that the scale-selection mechanism resides just below the intermittent region, y/S =0.3-0.5. This is also the location of the largest differences in the intensities, although the limited Reynolds number of the boundary-layer simulation (Reg «2000) prevents firm conclusions on the scaling of this location. The statistics of the new boundary layer are available from http://torroja.dmt.upm.es/ftp/blayers/.

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Section: Basic Statisticssupporting

confidence: 71%

Section: Basic Statisticsmentioning

confidence: 99%

Section: The Geometry Of the Vortical Structuresmentioning

confidence: 99%

“…•, (Schlatter et al 2009). Experimental boundary layers: V (Schewe 1983); A (Farabee & Casarella 1991); D (Tsuji et al 2007).…”

Section: Basic Statisticsmentioning

confidence: 99%

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Turbulent boundary layers and channels at moderate Reynolds numbers

et al. 2010

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“…28,29 For comparison and scaling purpose, the Reynolds numbers considered for the current cases are Re τ ≈ 550, 1000, 1500 and 550, 1000, 1350 for TCF and TBL, respectively, and the specified subdomain considered for both type of flows is around 0.3h, well in the outer region, more specifically, 0.3h for TCF, and 0.22-0.38δ for TBL, where turbulence dominates and boundary layer intermittency is negligible. Some related results will be discussed in Sec.…”

Section: Results and Analysismentioning

confidence: 99%

Universality and scaling phenomenology of small-scale turbulence in wall-bounded flows

et al. 2014

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The Reynolds number scaling of flow topology in the eigenframe of the strain-rate tensor is investigated for wall-bounded flows, which is motivated by earlier works showing that such topologies appear to be qualitatively universal across turbulent flows. The databases used in the current study are from direct numerical simulations (DNS) of fully developed turbulent channel flow (TCF) up to friction Reynolds number Re τ ≈ 1500, and a spatially developing, zero-pressure-gradient turbulent boundary layer (TBL) up to Re θ ≈ 4300 (Re τ ≈ 1400). It is found that for TCF and TBL at different Reynolds numbers, the averaged flow patterns in the local strain-rate eigenframe appear the same consisting of a pair of co-rotating vortices embedded in a finite-size shear layer. It is found that the core of the shear layer associated with the intense vorticity region scales on the Kolmogorov length scale, while the overall height of the shear layer and the distance between the vortices scale well with the Taylor micro scale. Moreover, the Taylor micro scale collapses the height of the shear layer in the direction of the vorticity stretching. The outer region of the averaged flow patterns approximately scales with the macro scale, which indicates that the flow patterns outside of the shear layer mainly are determined by large scales. The strength of the shear layer in terms of the peak tangential velocity appears to scale with a mixture of the Kolmogorov velocity and root-mean-square of the streamwise velocity scaling. A quantitative universality in the reported shear layers is observed across both wall-bounded flows for locations above the buffer region. C 2014 AIP Publishing LLC. [http://dx

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Statistical Approach to Wall Turbulence

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Turbulent boundary layers up to Reθ=2500 studied through simulation and experiment

Cited by 239 publications

References 20 publications

Turbulent boundary layers and channels at moderate Reynolds numbers

Turbulent boundary layers and channels at moderate Reynolds numbers

Universality and scaling phenomenology of small-scale turbulence in wall-bounded flows

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