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The effect of boundary layer thickness on cavity flow over a backward-facing step

Citation

Pearce, BW and Brandner, PA and Foster, SJ and Zarruk, GA, The effect of boundary layer thickness on cavity flow over a backward-facing step, The Proceedings of the 19th Australasian Fluid Mechanics Conference, 8-11 December, Melbourne, Australia, pp. 1-4. ISBN 978-0-646-59695-2 (2014) [Refereed Conference Paper]


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Copyright Statement

Copyright 2014 Australasian Fluids Mechanics Society

Official URL: http://afms.org.au/proceedings.html#proceedings

Abstract

Ventilated cavities detaching from a backward facing step are investigated for a range of upstream boundary layer thicknesses in a cavitation tunnel. The upstream turbulent boundary layer thickness is varied by artificial thickening of the test section natural boundary layer using an array of transversely injected jets. Momentum thickness Reynolds numbers from 8.5 to 28103 were tested giving boundary layer thickness to step height ratios from 1.25 to 3.8. A range of cavitation numbers (based on the cavity pressure) were obtained by variation of the ventilation flow rate for fixed freestream Reynolds and cavitation numbers. Cavity length to step height ratios from 15 to 60 were achieved. Cavity length was found to be linearly dependent on ventilation rate and to decrease with increasing boundary layer thickness. This result may have implications in the practical optimization of these flows which occur in applications such as drag reduction on marine hull forms.

Item Details

Item Type:Refereed Conference Paper
Keywords:cavity backwards step
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Ocean Engineering
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in Engineering
Author:Pearce, BW (Dr Bryce Pearce)
Author:Brandner, PA (Professor Paul Brandner)
Author:Foster, SJ (Mr Samuel Foster)
Author:Zarruk, GA (Dr Gustavo Zarruk Serrano)
ID Code:97594
Year Published:2014
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2014-12-29
Last Modified:2016-02-29
Downloads:33 View Download Statistics

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