Abstract
Pulsed-wire measurements of wall shear stress have been made beneath two separation bubbles. In one a cross flow was generated by means of a (25°) swept separation line. Fluctuating stresses in orthogonal “streamwise” and cross-flow directions are very nearly equal and independent of at least moderate cross flow velocity. These fluctuations are largely determined by large-scale motions in the outer flow, whereas the mean shear stresses are not. The pdf of the “streamwise” fluctuations is unchanged by the cross flow. When a cross flow is present the pdf of the cross-flow stresses is similar to the “streamwise” pdf. Dependence on Reynolds number is the same in both flows.
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Received: 10 April 1998/Accepted: 17 July 1998
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Hancock, P. Measurements of mean and fluctuating wall shear stress beneath spanwise-invariant separation bubbles. Experiments in Fluids 27, 53–59 (1999). https://doi.org/10.1007/s003480050328
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DOI: https://doi.org/10.1007/s003480050328