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 study with a few bias in the direction of learn in Europe, because it represents a nearly whole number of the paper displays on the Sixth eu Turbulence Conference, subsidized 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 totally constructed turbulence have endured to obtain such a lot cognizance by way of the learn neighborhood and lots more and plenty development has been made because the final ecu Turbulence convention in 1994. the quantity is therefore geared in the direction of experts within the region of circulate turbulence who couldn't attend the convention, in addition to anyone who needs speedy to evaluate the main lively present learn parts and the teams linked to them.

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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.

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.

Since in LES the major fraction of the turbulent fluctuations is resolved explicitly in space and time, the details of the subgrid-scale (SGS) model do not play 19 S. Gavrilakis et al. ). Advances in Turbulence VI, 19-22. © 1996 Kluwer Academic Publishers. 20 that much of an important role as in conventional turbulence models. It is also for this reason that we expect LES to do a better job in simulations of turbulent flows in bafRed stirred tank reactors than can be achieved with RANS methods based on turbulence modeling.

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