Advances in Turbulence VI: Proceedings of the Sixth European by G. Bärwolff, H. Wengle, H. Jeggle (auth.), S. Gavrilakis, L.

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

Advances in Turbulence VI offers an replace at the kingdom of turbulence learn with a few bias in the direction of learn in Europe, because it represents a virtually entire choice of the paper shows on the Sixth eu Turbulence Conference, backed through EUROMECH, ERCOFTAC and value, 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 absolutely built turbulence have endured to obtain so much awareness by means of the examine group and masses development has been made because the final eu Turbulence convention in 1994. the amount is therefore geared in the direction of experts within the region of stream turbulence who couldn't attend the convention, in addition to anyone who needs speedy to evaluate the main energetic present learn parts and the teams linked to them.

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Additional info for Advances in Turbulence VI: Proceedings of the Sixth European Turbulence Conference, held in Lausanne, Switzerland, 2–5 July 1996

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Visualization of the instantaneous vorticity field at t= 80 H/Uo is provided on Figure 2. Compared with the structure-function (SF) case mentioned above at the same Ri, Kelvin-Helmholtz instability starts immediately behind the step, with quasi two-dimen sional pairings. Further downstream, the mixing-layer growth is blocked. It is clear that the SSF model is here much more reliable than its SF counterpart, which dissipates too much the quasi two-dimensional fields induced by stratification. F igure 2: Stra tified backstep (SSF model), high step, regular grid, vorti city modulus , together wi th temper a ture and vorticity cuts at mid planes .

4 where the reproduction of fh and of total f the liCW equation IS presented for a plane channel flow, using the DNS data for all input variables. 0"" P,""". 4-4 p. •• _ •. 00 p. C/k-C. 't- o Go,. 0 p . 010 - .. --- -0:". 005 o. o. o ~ ~ ~ ~v~ ~ ~ ~ ~ ~v~ ~ Fig. 1 New model of mixed production of c for conventional (a) and new (b) c-equation o. , I b) I o. ;0 Pla,,.. 1 nl R ••-5600 . o. 92 I. -Do. ·cd... O~ ~ ~ ~ ~V ~ 0 ~ 20 ~ Ztr- 30 40 Fig. 3 Model of p,4 - Y for conventional (a) and new (b) c-equation 50 --.

O. 0. - -. 010 10 20 30 ~ y' 50 o. ~ Fig. 1 1 10 y' lOO Fig. 4 Computed c h and c by new model. 3, CONCLUSION The derivation of the dissipation equation from the two-point correlation and reformulating the models of each term using some novel arguments and the notions of the vorticity transport theory shows that it is possible to perform term-by-term modelling for nearequilibrium low-Re-number shear flows in good agreement with DNS data. Acknowledgement: The authors acknowledge fruitful discussions with Dr.

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