Interaction of large-scale and small-scale oscillations during separation of a laminar boundary layer

The mutual influence of short-wave oscillations (instability waves of the separated boundary layer) and long-wave disturbances at the frequency of shedding of periodic large-scale vortices is experimentally studied in flow separation behind a step. The possibility of controlling the process of vortex formation by exciting amplifying disturbances in the shear layer is demonstrated.