New PDF release: Coherent Structures in Complex Systems: Selected Papers of

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

ISBN-10: 3540417052

ISBN-13: 9783540417057

ISBN-10: 3540446982

ISBN-13: 9783540446989

A wealthy number of real-life actual difficulties that are nonetheless poorly understood are of a nonlinear nature. Examples contain turbulence, granular flows, detonations and flame propagation, fracture dynamics, and a wealth of recent organic and chemical phenomena that are being chanced on. fairly attention-grabbing one of the manifestations of nonlinearity are coherent constructions. This publication comprises studies and contributions reporting at the state-of-the-art concerning the function of coherent constructions and styles in nonlinear science.

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Additional info 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

Sample text

Hemisphere, 1989. 6. J. Organized motion in turbulent flow. Annual Review of Fluid Mechanics, 13, 457–515, 1981. 7. H. & Sobrun, U. On the dynamics of nearwall turbulence. A. (ed), Turbulent Flow Structure Near Walls. The Royal Society. 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.

As a given portion of a turbulent flow is composed of structures of varying age and level of activity, ensemble-averaged approaches may present a more complicated or confused picture of the flowfield structure than actually exists. The highly complex nature of the threedimensional, time-evolving velocity and vorticity fields suggests the use of volumetric imaging of a passive scalar to reveal the spatial and temporal characteristics of the large-scale structure. As noted by Brown & Thomas [16] (among others), the essentially three-dimensional character of boundary layer motions 1 Rθ = ρe Ue θ/νe , and Rδ2 = ρe Ue θ/νw Self-Sustaining Mechanisms of Wall Turbulence 27 makes unambiguous detection of a complex process such as the turbulence generation cycle from a fixed measurement station difficult.

This is especially true for the cospectrum, even if the experiments used in the figure are very different from each other, giving strong support to the logarithmic velocity profile. Older compilations of stress cospectra for more homogeneous conditions can be found in [26,2]. It is interesting that the wavelengths implied by the spectra for the Reynolds stresses are longer than those the wall-normal velocity, even if the former, − u v , cannot exist without the latter. The reason is clarified by the spectral distribution of the structure parameter in figure 4(d), which describes the efficiency of the turbulent fluctuations in transporting momentum.

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Coherent Structures in Complex Systems: Selected Papers of the XVII Sitges Conference on Statistical Mechanics Held a Sitges, Barcelona, Spain, 5–9 June 2000 by Shigeo Kida (auth.), David Reguera, José Miguel Rubí, Luis López Bonilla (eds.)


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