Study on the turbulent stripe toward an unified concept of sub-critical transition in channel flow

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A series of large-scale DNS (direct numerical simulations) and flow-visualization experiments were conducted in two types of plane channel flows, i.e., plane Poiseuille flow and plane Couette flow , in the subcritical-transition regime. Both flows give rise to coexisting laminar and turbulent equilibrium regions in the form of oblique stripes, so-called the turbulent stripe. We found that the turbulence stripe is an intrinsic phenomenon for the transition and the reverse transition in a channel flow.According to the present results, we proposed a unified physical model for the transitional state and process of the turbulent channel flows