NDLI: Prediction of Longitudinal Roll Cells in Rotating Plane Turbulent Couette Flow

Content Provider	Springer Nature Link
Author	Pettersson Reif, B.A. Andersson, H.I.
Copyright Year	2000
Abstract	The ability of a second-moment closure to predict the three-componential mean flow which results when a plane Couette flow is subjected to moderate anticyclonic system rotation is explored. The counter-rotating streamwise-oriented roll cells, which may occur by the imposition of a destabilizing Coriolis force field, are treated as an integral part of the steady mean motion governed by the Reynolds-averaged Navier–Stokes equations. Near-wall effects are accounted for by Durbin's elliptic relaxation approach, while system rotation only appears naturally in rotational stress-producing terms and in the mean intrinsic vorticity in the non-linear pressure-strain model.The model predictions mimicked the most striking effects of anticyclonic rotation, as observed in a series of recent direct numerical simulations. In particular they reproduced the characteristic energetic roll-cell pattern, which inevitably enhanced the cross-sectional mixing. The broadening of the central core region, in which the primary mean velocity profile adjusted itself to make the absolute mean vorticity negligibly small, was well captured by the predictions, together with the remarkable damping of the turbulent velocity fluctuations. The success of the predictions supports the view that such large-scale structures as the rotational-induced roll cells should be treated as a part of the resolved mean flow field, the obvious and physically appealing implication being that the turbulence closure is left to represent nothing but real turbulence.
Starting Page	89
Ending Page	108
Page Count	20
File Format	PDF
ISSN	09354964
Journal	Theoretical and Computational Fluid Dynamics
Volume Number	14
Issue Number	2
e-ISSN	14322250
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-06-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Fluid Flow and Transfer Processes Condensed Matter Physics Computational Mechanics

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