Advances in Turbulence VII: Proceedings of the Seventh by S. Fauve, S. Aumaitre, P. Abry, J.-F. Pinton, R. Labbe

By S. Fauve, S. Aumaitre, P. Abry, J.-F. Pinton, R. Labbe (auth.), Uriel Frisch (eds.)

Advances in Turbulence VII comprises an summary of the nation of turbulence examine with a few bias in the direction of paintings performed in Europe. It represents a nearly entire number of the invited and contributed papers added on the 7th eu Turbulence convention, backed by means of EUROMECH and ERCOFTAC and arranged via the Observatoire de los angeles Côte d'Azur. New high-Reynolds quantity experiments mixed with new ideas of imaging, non-intrusive probing, processing and simulation offer top of the range info which positioned major constraints on attainable theories. For the 1st time, it's been proven, for a category of passive scalar difficulties, why dimensional research occasionally supplies the inaccurate solutions and the way anomalous intermittency corrections should be calculated from first rules. the amount is therefore geared in the direction of experts within the region of circulate turbulence who couldn't attend the convention in addition to anyone drawn to this speedily relocating box.

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Extra info for Advances in Turbulence VII: Proceedings of the Seventh European Turbulence Conference, held in Saint-Jean Cap Ferrat, France, 30 June – 3 July 1998 / Actes de la Septième Conférence Européenne de Turbulence, tenue à Saint-Jean Cap Ferrat, France, 30 Juin

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Vorticity field information was extracted from the velocity data using a X2 vorticity calculation method (Fouras & Soria(1998)). Instantaneous velocity field measurements for a separated flow from a blunt leading edge of a flat plate are shown in Figure 2(a). The corresponding vorticity contours for the same flow are shown in Figure 2(b). Small scale structures, emanating from the separation point, are clearly visible in the shear layer and appear to be convected along it. .... '. 85 (a) ........

It is known that secondary vorticity of the same sign can undergo the vortex ring leapfrogging process with the primary ring [6]. The vorticity generated at the piston face is of the same sign as the primary ring. When leapfrogging occurs, the secondary ring is accelerated due to an induced velocity from the primary ring. Conversely the primary ring expands and slows down allowing the secondary ring to pass through. In this manner the core of the primary ring becomes distorted, particularly if the leapfrogging is not "clean".

2mm order. For higher s+-values (see Fig. 3, right) the rib tips protrude out of the viscous sublayer and no locally constant gradient comparable to the one of the viscous calculation can be found. Actually, this situation corresponds to the conditions of " rough" surfaces. References 1. 2. 3. 4. 5. 6. W. & Bartenwerfer, M. (1989) The viscous flow on surfaces with longitudinal ribs, J. Fluid Meeh. 206, pp. 105-129. , & Meyer, R (1997) Biological surfaces and their technological application - laboratory and flight experiments on drag reduction and separation control, AIAA paper.

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