Abstract
Transport mechanisms at the interface between a laminar and a turbulent plane Couette flow are examined by means of DNS data of a statistically steady flow field. A mixing-layer is established which neither evolves in the streamwise direction nor in time. This novel flow configuration is perfectly suited for explorations of momentum transfer mechanisms, e.g. turbulent diffusion. Unexpected undulations characterize the large-scale interactions between the turbulent and the nominally non-turbulent part flow. However, surprisingly large velocity fluctuations are observed even in the low-Re half of the flow which otherwise would be laminar.
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