Book ChapterDOI
A Review of Vortex Structures and Associated Coherent Motions in Turbulent Boundary Layers
Stephen K. Robinson
- pp 23-50
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TLDR
The experimental and computational evidence for the existence and role of vortices in turbulent boundary layers is briefly reviewed in this article, and various published conceptual models for horseshoe-like vortical structures are compared.Abstract:
The experimental and computational evidence for the existence and role of vortices in turbulent boundary layers is briefly reviewed. Quasi-streamwise and transverse vortices are considered, and various published conceptual models for horseshoe-like vortical structures are compared. The causes for upright and inverted horseshoe-shaped vorticity lines are discussed, and the distinction between vorticity lines and vortices is demonstrated. Finally, results from a numerically-simulated turbulent boundary layer are used to compute distributions of diameter, height, and strength for quasi-streamwise and spanwise vortices. These results confirm that quasi-streamwise vortices are clustered near the wall, while spanwise vortices are distributed throughout the layer. The variation of spanwise vortex core diameter with distance from the wall is found to be consistent with the mixing-length distribution for a boundary layer.read more
Citations
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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
Morphodynamics of Holocene salt marshes: a review sketch from the Atlantic and Southern North Sea coasts of Europe
TL;DR: In this paper, it was shown that the evolution from an organogenic to a sequence of mineralogenic marshes (transgressive overlaps) is accompanied by the initiation and invasive development of a branching network of tidal creeks.
Journal ArticleDOI
Reynolds Number Effects in Wall-Bounded Turbulent Flows
TL;DR: In this article, the state of the art of Reynolds number effects in wall-bounded shear-flow turbulence is reviewed, with particular emphasis on the canonical zero-pressure-gradient boundary layer and two-dimensional channel flow problems.
Journal ArticleDOI
A predictor-corrector technique for visualizing unsteady flow
D.C. Banks,B.A. Singer +1 more
TL;DR: An interactive system on a graphics workstation is implemented to permit a viewer to examine, in 3D, the evolution of the vortical structures in a complex, unsteady flow.
The structure of the vorticity field in turbulent channel flow. Part 2: Study of ensemble-averaged fields
John Kim,Parviz Moin +1 more
TL;DR: In this paper, the bursting process is associated with well-organized horseshoe vortices inclined at about 45 degrees to the wall, and these vortical structures are identified by examining the vortex lines of three-dimensional, ensemble averaged vorticity fields.
References
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Journal ArticleDOI
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.
Book
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
Direct simulation of a turbulent boundary layer up to R sub theta = 1410
TL;DR: In this paper, the turbulent boundary layer on a flat plate, with zero pressure gradient, is simulated numerically at four stations between R sub theta = 225 and R sub tta = 1410.