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Ventilated cavity flow over a backward-facing step

Citation

Pearce, BW and Brandner, PA and Foster, SJ, Ventilated cavity flow over a backward-facing step, Journal of Physics Conference Series: 9th International Symposium on Cavitation, 6-10 December 2015, Lausanne, Switzerland, pp. 1-4. ISSN 1742-6588 (2015) [Refereed Conference Paper]


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DOI: doi:10.1088/1742-6596/656/1/012164

Abstract

Ventilated cavities detaching from a backward facing step (BFS) 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 6.6 to 44 103 were tested giving boundary layer thickness to step height ratios from 1.25 to 3.8. A range of cavity lengths were obtained by variation of the ventilation flow rate for several freestream Reynolds numbers. Cavity length to step height ratios from 20 to 80 were achieved. Cavity length was found to be linearly dependent on ventilation rate and to decrease with increasing boundary layer thickness and/or Reynolds number. 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:ventilated cavity, backwards-facing step, drag reduction, boundary layer
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Ship and Platform Hydrodynamics
Objective Division:Manufacturing
Objective Group:Transport Equipment
Objective Field:Nautical Equipment (excl. Yachts)
Author:Pearce, BW (Dr Bryce Pearce)
Author:Brandner, PA (Associate Professor Paul Brandner)
ID Code:106495
Year Published:2015
Web of Science® Times Cited:1
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2016-02-11
Last Modified:2016-08-01
Downloads:61 View Download Statistics

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