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

Advances in Turbulence VII includes an summary of the nation of turbulence learn 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 ecu Turbulence convention, backed through EUROMECH and ERCOFTAC and arranged by way of 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 supply top of the range facts which placed 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 incorrect solutions and the way anomalous intermittency corrections will be calculated from first ideas. the quantity is therefore geared in the direction of experts within the quarter of circulate turbulence who couldn't attend the convention in addition to anyone drawn to this quickly 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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1991a Phys. Rev. Lett. 66(11), 1450-11453. Meneveau, C. 1991 b J. Fluid Mech. 232, 469-520. Morrison, 1. , Subramanian, C. S. and Bradshaw, P. 1992 J. Fluid Mech. 241, 75-108. Morrison, 1. F. , Tsai, H. M. and Bradshaw, P. 1989 Expts. Fluids 7, 173-186. Piomelli, U, Yu, Y. and Adrian, R. 1. 1996 Phys. Fluids 8(1), 215-224, 1996. Sandham, N. D. and Howard, R. 1. A. 1997 In Parallel CFD 1997, (ed. ) Elsevier, to appear. Wei, T. and Willmarth, W. W. 1989 J. Fluid Mech . 204, 57-95. Westbury, P. S.

U'v') will be decreased. The optimization experiments result in the optimal geometry of very thin blade-ribs (see. Fig. 1 and Refs. [2], [3] & [5]). In this case the maximum shear-stress reduction is almost 10%. 5%). Assuming a viscous flow over the riblets, the theory has shown that the origins of the velocity profiles of longitudinal- and cross-flow are located underneath the rib tips (see Fig. 2 and Refs. [1] & [6]). )/Tref. & s+ = s . uT/v with s == lateral rib spacing] (see Figs. 1 & 2). A higher gradient leads to more shear-stress reduction.

In the Berlin oil channel (Ref. [4]), where all the experiments were carried out, the lateral rib spacing is in the order of some millimeters. That is why we can use commercial hot-film probes for the velocity measurements very close to the surface. tm) stuck to the wire and deteriorated the calibration. By contrast, using hotfilm sensors, the time for this problem to occur is long enough to take data. A cleaning mechanism consisting of a small tube was installed several millimeters downstream of the sensors.

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