Advances in Turbulence: Proceedings of the First European - download pdf or read online

By J. T. Stuart (auth.), Professor Dr. Geneviève Comte-Bellot, Professor Dr. Jean Mathieu (eds.)

Since 1964 the most functionality of the ecu Mechanics Committee has been to rearrange Euromech Colloquia. those are 3- or four-day conferences for the dialogue of present examine on a specific and comparatively slim subject in mechanics, via approximately 50 experts selected for his or her lively involvement in examine in that subject. The association of every Euromech Colloquium is entrusted by way of the Committee to at least one or chosen scientists of reputation within the box, and those organizers are enjoined to accomplish a pleasant and casual discussion board for dialogue, with no less than paper paintings and expenditure. Over 220 Euromech Colloquia were held seeing that 1964 (about forty each one in France, West Germany and Britain and the rest in 18 international locations in either western and jap Europe) on quite a lot of subject matters drawn from the mechanics of good fabrics, hydrodynamics, fuel dynamics and mechanical structures. The Committee believes that jointly, Euromech Colloquia have made an important contribution to the trade of principles on subject matters in mechanics inside of Europe and feature thereby helped to beat the boundaries to effortless clinical conversation in that sorely divided continent. many years in the past the ecu Mechanics Committee grew to become its atten­ tion to the potential desire for eu meetings on a bigger scale than Euromech Colloquia.

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Extra resources for Advances in Turbulence: Proceedings of the First European Turbulence Conference Lyon, France, 1–4 July 1986

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Ed. T. , London, WCIE6BT, UK 1. INTRODUCTION This article is concerned with transition to turbulence in boundary layers and, by implication, in similar kinds of wall-bounded shear flows. g. on how rough the solid surface supporting the boundary layer is upstream or on how unsteady the oncoming free stream is. possible extremes of transition are the following. Two First there is the "fast", savage, transition that is epitomised by the wake-passing effect, from an upstream row of rotor blades, on the boundary layers on stator blades in turbines.

Here we review the numerical results and make some new observations on their relevance to transition to turbulence. 2. Numerical Results We have integrated the time-dependent vorticity equation of two-dimensional motion of an inviscid incompressible fluid with the appropriate boundary conditions to find the streamfunction for a variety of initial conditions as well as a variety of values of R, D and L. ) This gave various steady and time-periodic solutions at moderate values of R. The results are thought to be inaccurate when R is more than 200, so they can tell us little about the later stages of transition.

J 1 = f If 1 r Direct Transition to Turbulence A direct transition from laminar to turbulent motion can be realized by a sudden start of the inner sphere to a high supercritical Reynolds number Re > 8000 . The turbulence appears first at the equator and than for different times the transition fronts are spreading toward the poles as shown in Figure 12 . A simple description can be given by applying the analogy to the Rayleigh- Stokes plate problem [7] . By the high acceleration of the inner sphere a diffusion process in radial di r ection takes place .

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