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An experimental study of unsteady behaviour of cavity flow over a 2-D wall-mounted fence


Barbaca, L and Pearce, BW and Brandner, PA and Ganesh, H and Ceccio, SL, An experimental study of unsteady behaviour of cavity flow over a 2-D wall-mounted fence, Proceedings of the 10th Symposium on Cavitation (CAV2018), 14-16 May 2018, Baltimore, Maryland, USA, pp. 66-71. ISBN 9780791861851 (2018) [Refereed Conference Paper]

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Copyright 2018 ASME

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DOI: doi:10.1115/1.861851_ch14


The unsteady behaviour of ventilated and natural cavity flows over a 2-D wall-mounted fence is investigated for fixed length cavities with varying free-stream velocity using still imaging, X-ray densitometry and dynamic surface pressure measurement in two experimental facilities. Cavities in both ventilated and natural flows were found to have a re-entrant jet closure, but not to exhibit large-scale oscillations, rather irregular small-scale shedding at the cavity closure. Small-scale cavity break-up was associated with a high-frequency broad-band peak in the wall pressure spectra, found to be governed by the overlying turbulent boundary layer characteristics, similar to observations from single-phase flow over a forward-facing step. A low-frequency peak reflecting the oscillations in size of the re-entrant jet region, analogous to ‘flapping’ motion in single-phase flow, was found to be modulated by gravity effects (i.e. a Froude number dependence).

Item Details

Item Type:Refereed Conference Paper
Keywords:cavitation, wall-mounted fence, dynamic behaviour
Research Division:Engineering
Research Group:Maritime engineering
Research Field:Ship and platform structures (incl. maritime hydrodynamics)
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in engineering
UTAS Author:Barbaca, L (Dr Luka Barbaca)
UTAS Author:Pearce, BW (Dr Bryce Pearce)
UTAS Author:Brandner, PA (Professor Paul Brandner)
ID Code:131930
Year Published:2018
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2019-04-12
Last Modified:2019-06-19

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