Reynolds stress scaling in the near-wall region of wall-bounded flows
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In this article, a new scaling is derived that yields a Reynolds number independent profile for all components of the Reynolds stress in the near-wall region of wall bounded flows, including channel, pipe and boundary layer flows.Abstract:
A new scaling is derived that yields a Reynolds number independent profile for all components of the Reynolds stress in the near-wall region of wall bounded flows, including channel, pipe and boundary layer flows. The scaling demonstrates the important role played by the wall shear stress fluctuations and how the large eddies determine the Reynolds number dependence of the near-wall turbulence behavior.read more
Citations
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Data-driven enhancement of coherent structure-based models for predicting instantaneous wall turbulence
TL;DR: In this article, a 3D geometry of the statistically significant eddies from multi-point wall-turbulence datasets is extracted for direct implementation into coherent structure-based models to improve their predictions.
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Data-driven enhancement of coherent structure-based models for predicting instantaneous wall turbulence
TL;DR: In this article, a 3D geometry of the statistically significant eddies from multi-point wall-turbulence datasets is extracted for direct implementation into coherent structure-based models to improve their predictions.
References
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Logarithmic scaling of turbulence in smooth- and rough-wall pipe flow
TL;DR: In this paper, the streamwise component of the turbulent fluctuations in fully developed smooth and rough pipe flow is presented over an unprecedented Reynolds number range, and the onset of the logarithmic region is found at a location where the wall distance is equal to 100 times the Kolmogorov length scale, which then marks sufficient scale separation for inertial scaling.
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On the fluctuating wall-shear stress in zero pressure-gradient turbulent boundary layer flows
Ramis Örlü,Philipp Schlatter +1 more
TL;DR: In this paper, Wu et al. presented a recent compilation of direct numerical simulation (DNS) results relating to the behavior of the fluctuating wall-shear stress τw,rms+ in turbulent boundary layer flows.
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Transitional–turbulent spots and turbulent–turbulent spots in boundary layers
Xiaohua Wu,Parviz Moin,James M. Wallace,Jinhie Skarda,Adrián Lozano-Durán,Jean-Pierre Hickey +5 more
TL;DR: It is described here how turbulent spots are initiated in bypass boundary-layer transition and the ubiquity of concentrations of vortices in the fully turbulent region with characteristics remarkably like transitional–turbulent spots is uncovered.
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Turbulence statistics in Couette flow at high Reynolds number
TL;DR: In this article, the authors investigate the behavior of the canonical turbulent Couette flow at computationally high Reynolds number through a series of large-scale direct numerical simulations and show that deviations from the log law are systematic, and probably increasing at higher Reynolds numbers.
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Spectral analysis of the budget equation in turbulent channel flows at high Re
Myoungkyu Lee,Robert D. Moser +1 more
TL;DR: In this article, the authors investigated the transport equations for velocity variances using data from DNS of incompressible channel flows at up to 5200, and showed that the energy is transferred from the streamwise elongated modes to modes with a range of orientations through nonlinear interactions.