Coherent Structures in Complex Systems: Selected Papers of by Shigeo Kida (auth.), David Reguera, José Miguel Rubí, Luis

By Shigeo Kida (auth.), David Reguera, José Miguel Rubí, Luis López Bonilla (eds.)

A wealthy number of real-life actual difficulties that are nonetheless poorly understood are of a nonlinear nature. Examples comprise turbulence, granular flows, detonations and flame propagation, fracture dynamics, and a wealth of recent organic and chemical phenomena that are being came across. fairly fascinating one of the manifestations of nonlinearity are coherent buildings. This ebook includes experiences and contributions reporting at the state-of-the-art in regards to the function of coherent constructions and styles in nonlinear science.

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Additional resources for Coherent Structures in Complex Systems: Selected Papers of the XVII Sitges Conference on Statistical Mechanics Held a Sitges, Barcelona, Spain, 5–9 June 2000

Example text

Candidate nonlinear waves have been computed by [36] and others, and identified as part of a particular path to turbulent transition in [38]. Finally, reduced models based on this approach have been formulated in [35]. A difficulty with most of these studies is that there is no clear connection between the object being identified and full-scale turbulence. What is needed is a demonstration that a turbulent flow can be continuously modified into one of these reduced objects while still remaining identifiably turbulent.

These elements have counterparts in those identified by Cantwell [6] but we will try to be more specific. This model does not describe all possible observations, but instead tries to represent the important kinematic and dynamic behavior in wall-bounded turbulent flows. First, we address the question of symmetric and asymmetric vortex loops. The horse-shoe vortex of Theodorson, the hairpin loops of Head & Bandyopadhyay, and the lambda-shaped vortices of Perry & Chong, are symmetric structures. It has been widely reported in experimental studies and Direct Numerical Simulations (DNS) that the vortex structures observed in boundary layers are only rarely symmetric and asymmetric structures dominate (see, for example, [5] and chapter 8 in [1]).

First published in Phil. Trans. R. Soc. London A. 336, 1991. 8. S. & Bradshaw, P. Bursts and the law of the wall in turbulent boundary layers. Journal of Fluid Mechanics, 241, 1992. 9. R. P. The characteristics of low-speed streaks in the nearwall region of a turbulent boundary layer. Journal of Fluid Mechanics, 129, 27–54, 1983. Self-Sustaining Mechanisms of Wall Turbulence 37 10. F. J. On the structure of high-Reynoldsnumber supersonic turbulent boundary layers. Journal of Fluid Mechanics, 222, 293–327, 1991.

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