Advances in Turbulence 2: Proceedings of the Second European by D. S. Henningson (auth.), Professor Dr. Hans-Hermann

By D. S. Henningson (auth.), Professor Dr. Hans-Hermann Fernholz, Professor Dr. Heinrich E. Fiedler (eds.)

The moment eu Turbulence convention was once held on the Technische Univer­ sitat Berlin, Federal Republic of Germany, from August thirtieth to September 2d 1988 less than the auspices of the ecu Mechanics Committee. It was once primar­ ily dedicated to primary points of turbulence, and aimed toward bringing jointly engineers, physicists, and mathematicians. The clinical committee - serving additionally as Sub-committee of the eu Turbulence convention - consisted of the subsequent individuals: G. Comte-Bellot (Lyon), H.-H. Fernholz and H.E. Fiedler (both from Berlin) as co-chairmen of the convention, U. Frisch (Nice), J.C.R. Hunt (Cambridge), E. Krause (Aachen), M. Landahl (Stockholm), A.M. Obukhov (Moscow), and G. Ooms (Amsterdam). The convention programme comprised 6 invited lectures and ninety four contributions, offered both orally or at poster periods. there have been one hundred sixty five contributors from 18 international locations. All papers released in those convention lawsuits have been, apart from the invited ones, back refereed by means of the participants of the medical committee. the most study subject matters mentioned at this assembly have been balance and gener­ ation of turbulence, results of rotation, stratification and buoyancy forces, novel instrumentation, manipulation and keep an eye on, boundary layers with separation and reattachment, desktop simulation, turbulent diffusion, picture research and stream visualization, vorticity dynamics and turbulence, and large-scale constructions. we now have taken the freedom of regrouping a few papers following the submitted ultimate models for this quantity. Authors could consequently locate their paper below a special heading from that during the convention programme.

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Extra info for Advances in Turbulence 2: Proceedings of the Second European Turbulence Conference, Berlin, August 30 – September 2, 1988

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5. 4. 19). 40 5. How coherent stuctures transport momentum and heat Coherent structures contribute to the transport of momentum and heat and give rise to a coherent shear-stress uv and a lateral heat flux va. By conventional averaging, one would obtain the corresponding total shear stress and heat flux: v et t = 'V9 + v 19' Th~easurements 161 show that at x/do = 4, the coherent part of the momentum flux U is very small compared to the turbulent part UIVI (fig. 6a), although the rms values of and are of the same~der of magnitude as those of u and Vi.

I. 93. In other words, the ki nemati c potenti a1 core extends beyond this pOint while at the same position the thermal mixing layer has already reached the jet axi s. Moreover, the velocity profi 1e is bell-shaped whereas the -profil e presents three points of inflection suggesting particularly active mixing on both sides of the thermal layer in this region. e 4. Coherent temperature and velocity fields The downstream evolutions of the coherent fluctuations of the velocity and of the temperature on the jet axis in the potential core are strikingly different (Fig.

The collapse of the data at the three stations is quite good. Figure 4 is therefore consistent with similarity when h is identified with the similarity length scale. 085. This particu- lar y /h location falls in a region (Figure 2) where Np is constant and maximum. Numbers, instead of symbols, are used to refer to structures at any Xs location. Parallel lines can be drawn through the same numbers. , Figure 4), at the corresponding y/h value. This tends to suggest that the convection velocity of the structures remains constant over a significant streamwise distance.

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