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B. Scheichl, A. Kluwick, F.T. Smith:
"Break-away separation for high turbulence intensity and large Reynolds number";
Journal of Fluid Mechanics, 670 (2011), S. 260 - 300.

Massive flow separation from the surface of a plane bluff obstacle in an incompressible uniform stream is addressed theoretically for large values of the global Reynolds number Re. The analysis is motivated by a conclusion drawn from recent theoretical results which is corroborated by experimental findings but apparently contrasts with common reasoning: the attached \bl extending from the front stagnation point to the position of separation never attains a fully developed turbulent state, even for arbitrarily large Re. Consequently the boundary layer exhibits a certain level of turbulence intensity that is linked with the separation process, governed by local viscous--inviscid interaction. Eventually, the latter mechanism is expected to be associated with rapid change of the separating shear layer towards a fully developed turbulent one. A self-consistent flow description in the vicinity of separation is derived, where the present study includes the predominantly turbulent region. We establish a criterion that acts to select the position of separation. The basic analysis here which appears physically feasible and rational is carried out without needing to resort to a specific turbulence closure.

Boundary Layers, Separation, Turbulent Flows

http://dx.doi.org/10.1017/S0022112010005306

http://publik.tuwien.ac.at/files/PubDat_187970.pdf