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 used to be held on the Technische Univer­ sitat Berlin, Federal Republic of Germany, from August thirtieth to September second 1988 lower than the auspices of the ecu Mechanics Committee. It was once primar­ ily dedicated to primary facets of turbulence, and geared toward bringing jointly engineers, physicists, and mathematicians. The clinical committee - serving additionally as Sub-committee of the ecu Turbulence convention - consisted of the subsequent contributors: 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, awarded both orally or at poster periods. there have been one hundred sixty five contributors from 18 international locations. All papers released in those convention complaints have been, apart from the invited ones, back refereed via the contributors of the medical committee. the most examine issues 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, computing device simulation, turbulent diffusion, photograph research and circulate visualization, vorticity dynamics and turbulence, and large-scale buildings. we now have taken the freedom of regrouping a few papers following the submitted ultimate types for this quantity. Authors may possibly accordingly locate their paper less than a special heading from that during the convention programme.

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

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Downstream development of temperature and velocity coherent fluctuation rms on jet-axis S:! Cl c:> 0 V ,/dO=d,OOO .... 6. 6 Fig. 3. (9) (1 - ) exhi bit very 1arge variations during a cycle (fig. 2. ::.. " .......... "'.. :. _.... _" ... -' .. ",,,: :.. ~-:'.. 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.

1988). results of vortex tubes. In case 2, due to the choice of the value for v, the computed vortex lines appear to be smooth. This is of the same type of behavior as those seen in the experimental vortex ring pairs by Oshima et al. (Fig. 3). 2 Elliptical Vortex Ring The initial vorticity distribution for the elliptic vortex ring is generated in an elliptical coordinate system (e, 1), z) using the approach of Chamberlain & Weston(1984). 0. The initial core radius was prescribed as {; = 1. 1, the resulting Reynold's number is r/v ~ 700.

Gutmark and Blackwelder, 1987). The difference between ULE and UTE simply reflects the streamwise elongation of the spot as Xs increases and does not imply a decrease in the convection velocity of structures towards the trailing edge. The elongation of the spot is due to the appearance of new structures that travel at the same convection velocity. It is possible to estimate an average location for the origin of the new structures using the information in Figure 5. For example, the origin of the eighth structure may be estimated by extrapolating the line joining the numbers 8 until it intersects the trailing edge locus.

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