Ginzburg--Landau description of laminar-turbulent oblique band formation in transitional plane Couette flow

Details Ginzburg--Landau description of laminar-turbulent oblique band formation in transitional plane Couette flow Ginzburg--Landau description of laminar-turbulent oblique band formation in transitional plane Couette flow

2011-02-15

arxiv.org/abs/1102.2997v1

European Physics Journal B volume 80, pages 529--544 (2011)

Physics

Fluid Dynamics

21 pages 21 figures. Accepted for publication in European Physics Journal B

Scientific paper

10.1140/epjb/e2011-10730-1

Plane Couette flow, the flow between two parallel planes moving in opposite directions, is an example of wall-bounded flow experiencing a transition to turbulence with an ordered coexistence of turbulent and laminar domains in some range of Reynolds numbers [R_g,R_t]. When the aspect-ratio is sufficiently large, this coexistence occurs in the form of alternately turbulent and laminar oblique bands. As R goes up trough the upper threshold R_t, the bands disappear progressively to leave room to a uniform regime of featureless turbulence. This continuous transition is studied here by means of under-resolved numerical simulations understood as a modelling approach adapted to the long time, large aspect-ratio limit. The state of the system is quantitatively characterised using standard observables (turbulent fraction and turbulence intensity inside the bands). A pair of complex order parameters is defined for the pattern which is further analysed within a standard Ginzburg--Landau formalism. Coefficients of the model turn out to be comparable to those experimentally determined for cylindrical Couette flow.

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