Abo Bibliothek: Guest
Second Symposium on Turbulence and Shear Flow Phenomena
June, 27-29, 2001, KTH, Stockholm, Sweden

DOI: 10.1615/TSFP2

LARGE SCALE STRUCTURE AND COHERENT FINE SCALE EDDIES IN HIGH REYNOLDS NUMBER TURBULENT MIXING LAYERS

pages 131-136
DOI: 10.1615/TSFP2.1850
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ABSTRAKT

Direct numerical simulations of temporally developing turbulent mixing layers are conducted to investigate the large scale structure and the coherent fine scale eddies in high Reynolds number turbulent mixing layers. After the mixing transition, the large scale structure of turbulent mixing layer consists of many fine scale eddies and the number of fine scale eddies inside the large scale structure increases with the increase of Reynolds number. Since the scale of coherent fine scale eddies tends to become small compared with the large scale structure, spatial fluctuation of the energy dissipation rate becomes large for the case of high Reynolds number. In addition, the coherent fine scale eddies do not distribute uniformly inside the large scale structure and form relatively large aggregations in the high Reynolds number case. Large Reynolds stress regions are observed between these aggregations of fine scale eddies. This mechanism of production of the Reynolds stress is very similar to that in turbulent channel flow.

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