By G. Bärwolff, H. Wengle, H. Jeggle (auth.), S. Gavrilakis, L. Machiels, P. A. Monkewitz (eds.)

Advances in Turbulence VI provides an replace at the country of turbulence examine with a few bias in the direction of examine in Europe, because it represents a nearly entire selection of the paper shows on the Sixth ecu Turbulence Conference, backed through EUROMECH, ERCOFTAC and price, and held on the Swiss Federal Institute of know-how in Lausanne, July 2-5, 1996. the matter of transition, including the structural description of turbulence, and the scaling legislation of totally constructed turbulence have persevered to obtain such a lot realization via the study group and lots more and plenty growth has been made because the final ecu Turbulence convention in 1994. the amount is hence geared in the direction of experts within the sector of circulate turbulence who couldn't attend the convention, in addition to anyone who needs fast to evaluate the main lively present learn components and the teams linked to them.

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P is the density difference). A wall law is used in the boundary layer. plgH/poUJ, 37 We have first carried out four LES using the structure-function model (six points), in order to study the effects of growing stratification on coherent vortices development. 25, stratification does not affect significantly the dynamics. 5, we observe a tendency towards two-dimensionalization upstream. Kelvin- Helmholtz vortices oscillate first in ph ase, then a strongly three-dimensional pairing occurs at x ~ 7H.

Dh increases with increasing N. In the illitial flow phase Dv decreases sharply with S. For t ? 1200 s, D,. is becoming \'ery small and its value is almost independent of N. The effective plume cross section given by A = Kaha" illcreases with time and stratification. TABLE 1. Values of the effective diffusion coefficients and their standard deviation for various values of N. N (10- 2 s-I) D" (m 2 s- l ) Du (m 2 s- l to;; ) 600 s D,. 1l:.! () 1 3. Investigation of situations with mean-flow shear Secondly, the influence of mean wind shear is investigated.

Vol. 118, pp. , Monkewitz, P. A. (1985) Absolute and convective instabilities in free shear flows, J. Fluid Meeh. Vol. 159, pp. , Gharib, M. (1992) The role of streamwise vorticity in the near-field entrainment of round jets, J. Fluid Meeh. Vol. 245, pp. 643-668 Mattingly, G. , Chang, C. C. (1974) Unstable waves on a axisymmetric jet column, J. Fluid Meeh. Vol. 65, pp. 541-560 Plaschko, P. (1979) Helical instabilities of slowly divergent jets, J. Fluid Meeh. Vol. 92, pp. 209-215 Yule, A. J. (1978) Large structures in the mixing layer of a round jet, J.

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