Effect of boundary-layer superstructures on separation bubble unsteadiness

Abstract eng:
In order to investigate the cause of the low-frequency unsteadiness of a pressure-induced turbulent separation bubble (TSB), long meandering superstructures are observed in the zero-pressure-gradient turbulent boundary layer well upstream of the TSB. The characteristic frequency associated with the superstructures is compared to that of the low-frequency breathing motion previously documented in the TSB. The large difference between the two characteristic frequencies indicates that the superstructures are not the cause of the unsteadiness.

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