Abstract
Abstract
Highlights
Transition to turbulence in wall-bounded shear flows is a classical problem of both fundamental and practical interest, which, has not yet been fully understood
We present detailed experimental analysis of the localized turbulent structures triggered by a strong impulsive perturbation in the transitional range of Reynolds numbers in plane Couette–Poiseuille flow
We demonstrate for the first time that the scale separation of velocity field holds in plane Couette–Poiseuille flow and, using this, we extract the large-scale flow from our measurements
Summary
Transition to turbulence in wall-bounded shear flows is a classical problem of both fundamental and practical interest, which, has not yet been fully understood. We experimentally investigate the transitional range of Reynolds numbers in plane Couette–Poiseuille flow, an example of a shear flow, which has received little attention up to now (see Klotz et al (2017) and references therein). The Couette–Poiseuille velocity profile with zero-mean advection velocity (similar to our case) was investigated by Huey & Williamson (1974) and Tsanis & Leutheusser (1988), who concentrated mainly on fully developed turbulence. Tsanis & Leutheusser (1988) stated that the transition from the laminar to the turbulent state occurs at Re ≈ 900, but without discussing this result
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