By J. C. R. Hunt (auth.), J. P. Bonnet, M. N. Glauser (eds.)
The life and an important position performed by means of large-scale, geared up motions in turbulent flows at the moment are famous by way of commercial, utilized and basic researchers alike. It has develop into more and more obtrusive that coherent buildings effect blending, noise, vibration, warmth move, drag, etc... The accelera tion of the improvement of either experimental and computational courses dedicated to this subject has been obvious at numerous fresh foreign meet ings. one of many first questions which experimentalists or numerical analysts are confronted with is: how can those constructions be separated from the heritage turbulence? this can be a nontrivial job as the coherent buildings are gen erally embedded in a random box and the procedure used to figure out while and the place yes constructions are passing, or their averaged features (in the extra possible or dominant position feel) is at once on the topic of the definition of the coherent constitution. numerous tools or methods can be found and the alternative of a selected one is mostly depending on the specified informa tion. This selection relies not just at the definition of the constitution, but in addition at the experimental and numerical functions on hand to the researcher.
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Extra resources for Eddy Structure Identification in Free Turbulent Shear Flows: Selected Papers from the IUTAM Symposium entitled: “Eddy Structures Identification in Free Turbulent Shear Flows” Poitiers, France, 12–14 October 1992
Sample text
C. 1991 {{Kolmogorov's contributions to the physical and geometrical understanding of small scale turbulence and recent developments" Proc. R. Soc. R. 1992 "Developments in computational modelling of turbulent flows" In "ERCOFTAC workshop on numerical simulation of unsteady flows" (Ed. O. Pirroneau, et al) Cambridge Univ. Press (9) Hussain F. 1986 "Coherent structures and turbulence" J. 303-356 (10) Hussain F. 1993 "Understanding coherent structures through vortex dynamics" Proc. IUTAM Conf. N.
S. 1982 "Strained spiral vortex model for turbulent fine structure" Phys. 2193 [13] Moros A. R. 1993 "Coherent structures in fluid-structure interaction phenomena" Paper presented at the IUTAM Conf. on "Eddy structure identification", Poitiers, Oct. A. 1976 "Structure of turbulent shear flow" Cambridge Univ. C. R. 1991 "Fractal dimensions and spectra of interfaces with application to turbulence" Proc. R. Soc. A. K. The subject of the conference might provoke a bystander to wonder why so much brain power and material resources are being applied to extracting recurrent patterns from chaotic turbulent flows and what we hope to do with the information if and when we have it.
The low enstrophy bubble in figure 2i forms in the region with a strong local compression. Since the compression is only significant near the axis, it follows that the vorticity magnitude will decrease rapidly near the axis, but not near the edge of the vortex core. Hence the vortex becomes locally hollow, as is clearly seen in figure 2i. The bubble is not a permanent feature of the vorticity field (see figures 2i,I). Its disappearance is mainly due to a change in the enstrophy production, but is also due to "fill in" by viscous diffusion.