摘要：

The paper is devoted to the problem of nonlinear laminar-flow breakdown in wall bounded shear flows during their transition to the turbulent state. A brief review of some previously obtained results in this field is presented. The main attention is concentrated on a comparative analysis of the nonlinear phenomena observed in boundary layers, channels, and pipe flows. The associated mechanisms of turbulence production are also compared with those observed in developed wall turbulent flows. A striking resemblance is found in all considered cases.

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