Laminar-Turbulent Transition pp 199-214 | Cite as
On the Breakdown of a Wave Packet Disturbance in a Laminar Boundary Layer
Conference paper
Summary
The evolution and breakdown of a point disturbance in a flat-plate boundary layer has been examined. For a weak initial disturbance intensity, the breakdown was of the wave packet type. It occurred far downstream of the excitation station, after the decay of the transient disturbance and strong nonlinear distortions of the wave packet. Instantaneous velocity disturbances in the spanwise and normal directions revealed that the breakdown first occurred roughly 3δ* away from the centerline and lδ* above the wall, in a skewed shear region where the normal and spanwise shears were both strong and comparable.
Keywords
Wave Packet Ensemble Average Laminar Boundary Layer Initial Disturbance Turbulent Spot
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© Springer-Verlag Berlin Heidelberg 1990