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 ecu Turbulence convention used to be held on the Technische Univer­ sitat Berlin, Federal Republic of Germany, from August thirtieth to September 2d 1988 lower than the auspices of the ecu Mechanics Committee. It used to be primar­ ily dedicated to basic elements of turbulence, and aimed toward bringing jointly engineers, physicists, and mathematicians. The medical committee - serving additionally as Sub-committee of the ecu Turbulence convention - consisted of the subsequent participants: 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 classes. there have been one hundred sixty five members from 18 international locations. All papers released in those convention lawsuits have been, aside from the invited ones, back refereed through the individuals of the clinical committee. the most examine 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, computing device simulation, turbulent diffusion, picture research and movement visualization, vorticity dynamics and turbulence, and large-scale constructions. we've taken the freedom of regrouping a few papers following the submitted ultimate models for this quantity. Authors might accordingly locate their paper lower than a special heading from that during the convention programme.

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

Sample text

Both curves are in rather good agreement with the curves measured by Comte-Bellot (1965) in a wind tunnel and by Wallace et al. (1977) in an oil channel. yt ::; yt yt, 4 Interpretation of Results In the case of a 'steep' velocity increase a bulk of 'high speed' fluid is following a bulk of 'low speed' fluid. The high speed fluid impinges on the low speed fluid, hereby producing a comparitvely sharp front between both volumes. e. into a 'pancake'. The opposite process is 'banana making', when a volume of low speed fluid follows a volume of high speed fluid.

A stability analysis of the proper representative velocity field in the trailing edge zone is needed to elucidate the precise creation mechanism. This velocity field cannot be obtained by a simple ensemble average and will most probably require some conditional averaging which sensitive enough to highlight the unstable features of thr trailing zone. J. SOKOLOV, M. : 1981. Simultaneous Temperature and Velocity Measurements in the Plane of Symmetry of Turbulent Spot, J. Fluid Mech" J08, 317-343. J.

The equation effectively balanced within about 30 % ; thi sis a sati sfactory result consi deri ng the experi menta 1 diffi culti es and the number of terms involved. 7 in the mixing layer (Fig. 9). This is the value generally found in the developed turbulent jet. The data shows in addition that Pr t varies as 1 - sua across the jet. This representation Vte~ underscores the idea that the departures of the turbul ent Prandt 1 number from unity are due to the coherent transport of heat. '10 o. 20 o.

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