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Novel features of a fully developed mixing-layer between co-flowing laminar and turbulent Couette flows
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A new flow configuration has been proposed in which a bilateral mixing-layer exists in the junction between co-flowing laminar and turbulent plane Couette flows. Contrary to a classical plane mixing-layer, the present mixing-layer did neither grow in time nor in streamwise direction. However, the mixing zone varied with the distance from the stationary wall. A direct numerical simulation showed that very-large-scale flow structures were found in the turbulent part of the flow with Reynolds number 1300 based on half the velocity of the fastest-moving wall and half of the distance 2 between the walls. The laminar-turbulent interface exhibited a large-scale meandering motion with frequency 0.014 / and wavelength about 25. Large-scale Taylor-Görtler-like roll cells were observed in the nominally laminar flow region with Reynolds number 260. This tailor-made flow is particularly well suited for explorations of momentum transfer and intermittency in the vicinity of the laminar-turbulent interface.


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Scitation: Novel features of a fully developed mixing-layer between co-flowing laminar and turbulent Couette flows