Journal ArticleDOI
Some properties of truncated turbulence signals in bounded shear flows
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In this article, various statistical properties of the truncated streamwise and normal velocity components u and v and of their product uv have been determined in an attempt to characterize quantitatively the motions of the flow.Abstract:
Measurement results of turbulent shear flows are re-examined. Various statistical properties of the truncated streamwise and normal velocity components u and v and of their product uv have been determined in an attempt to characterize quantitatively the motions of the flow. Average values and probability density distributions both of the truncated and untruncated signals have been taken.read more
Citations
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Turbulence statistics in fully developed channel flow at low reynolds number
TL;DR: In this article, a direct numerical simulation of a turbulent channel flow is performed, where the unsteady Navier-Stokes equations are solved numerically at a Reynolds number of 3300, based on the mean centerline velocity and channel half-width, with about 4 million grid points.
Journal ArticleDOI
Coherent Motions in the Turbulent Boundary Layer
TL;DR: In this paper, the role of coherent structures in the production and dissipation of turbulence in a boundary layer is characterized, summarizing the results of recent investigations, and diagrams and graphs are provided.
Journal ArticleDOI
Numerical investigation of turbulent channel flow
Parviz Moin,John Kim +1 more
TL;DR: In this article, a large-scale flow field was obtained by directly integrating the filtered, three-dimensional, time dependent, Navier-Stokes equations, and small-scale field motions were simulated through an eddy viscosity model.
Journal ArticleDOI
On the wall structure of the turbulent boundary layer
Ron F. Blackwelder,R. E. Kaplan +1 more
TL;DR: In this paper, the wall structure of the turbulent boundary layer was examined using hot-wire rakes and conditional sampling techniques, and it was shown that the normal velocity is directed outwards in regions of strong stream-wise-momentum deficit, and inwards when the streamwise velocity exceeds its mean value.
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Sedimentological and fluid-dynamic implications of the turbulent bursting phenomenon in geophysical flows
TL;DR: The bursting process in turbulent boundary layers provides new insight on turbulence phenomena, mechanics of sedimentation, and genesis of bedforms in natural geophysical flows as mentioned in this paper, which can be divided into an inner zone and an outer zone, whose properties scale with the fluid-dynamic variables of the entire flow.
References
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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.
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Measurements of the structure of the Reynolds stress in a turbulent boundary layer
S. S. Lu,William W. Willmarth +1 more
TL;DR: In this article, the velocity at the edge of the viscous sublayer is used as a detector signal for bursts and sweeps, and the scaling of the mean time interval between bursts with outer flow variables is confirmed.
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The production of turbulence near a smooth wall in a turbulent boundary layer
TL;DR: In this paper, the structure of the flat plate incompressible smooth-surface boundary layer in a low-speed water flow is examined using hydrogen-bubble measurements and also hot-wire measurements with dye visualization.
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Structural features of turbulent flow over smooth and rough boundaries
TL;DR: In this article, the effects of different surface roughness conditions on the turbulence structure in the boundary region were investigated and it was shown that ejection phases corresponded with ejection of low momentum fluid outwards from the boundary whilst inrush phases were associated with the transport of high momentum fluid inwards towards the boundary.
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The wall region in turbulent shear flow
TL;DR: In this article, the instantaneous product signal uv was classified according to the sign of its components u and v, and these classified portions were then averaged to obtain their contributions to the Reynolds stress.