Wave Breakdown and Turbulence

摘要: Some new ideas on the dynamics of shear flow turbulence are presented. Central to these is phenomenon wave breakdown. This defined as onset a violent small-scale secondary instability developing large-scale primary disturbance wave-like traveling type. It suggested that breakdown together with ensuing mixing process (a turbulent “burst”) constitutes dominant nonlinear mechanism for fluctuating velocity field in boundary layer. A burst regeneration proposed whereby one can excite large defects which then may trigger breakdown, thus leading self-maintenance turbulence.