Three dimensional separated flow over the surface of a bluff body.

L. W. Welch, K. Hourigan, G. J. Flood, M. C. Welsh

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Separated flow round a bluff body gives rise to large vortex structures shed from the separation bubble. Studies of separted flow, including experimental, numerical and flow visualizations have concentrated on the two dimensional aspect of the flow on planes running parallel to the flow and normal to the plate surface. Early work at the C.S.I.R.O. has shown that two dimensional acoustic velocity perturbations can regulate the shedding process. More recent studies now show that such perturbations also influence the formation of spanwise structures. The paper presents results from studies made using constant temperature hot wire probes in separated flow perturbed by sound. Comparisons of the velocity time histories together with associated auto and cross correlations have led to the development of a three dimensional model of the large scale structures consistent with the measured data.

Original languageEnglish
Title of host publicationProceedings of the 9th Australasian Fluid Mechanics Conference
PublisherCCE Conf Management, Faculty of Arts, Univ. of Auckland
ISBN (Print)0868690902, 9780868690902
Publication statusPublished - 1 Jan 1986

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