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On the unsteady behaviour of cavity flow over a two-dimensional wall-mounted fence

Published online by Cambridge University Press:  10 July 2019

Luka Barbaca Open the ORCID record for Luka Barbaca [Opens in a new window] ,
Bryce W. Pearce Open the ORCID record for Bryce W. Pearce [Opens in a new window] ,
Harish Ganesh ,
Steven L. Ceccio  and
Paul A. Brandner Open the ORCID record for Paul A. Brandner [Opens in a new window]
Luka Barbaca*
Affiliation:
Australian Maritime College, University of Tasmania, Launceston, TAS, 7250, Australia
Bryce W. Pearce
Affiliation:
Australian Maritime College, University of Tasmania, Launceston, TAS, 7250, Australia
Harish Ganesh
Affiliation:
Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
Steven L. Ceccio
Affiliation:
Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA Department of Naval Architecture and Marine Engineering, University of Michigan, Ann Arbor, MI 48109, USA
Paul A. Brandner
Affiliation:
Australian Maritime College, University of Tasmania, Launceston, TAS, 7250, Australia
*
†Email address for correspondence: [email protected]
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Abstract

The topology and unsteady behaviour of ventilated and natural cavity flows over a two-dimensional (2-D) wall-mounted fence are investigated for fixed length cavities with varying free-stream velocity using high-speed and 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, yet the irregular small-scale shedding at the cavity closure. Small-scale cavity break-up was associated with a high-frequency broadband 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). Likewise, a significant change in cavity behaviour was observed as the flow underwent transition analogous to the transition from sub- to super-critical regime in open-channel flow. Differences in wake topology were examined using shadowgraphy and proper orthogonal decomposition, from which it was found that the size and number of shed structures increased with an increase in free-stream velocity for the ventilated case, while remaining nominally constant in naturally cavitating flow due to condensation of vaporous structures.

JFM classification

Drops and Bubbles: Cavitation Multiphase and Particle-laden Flows: Multiphase flow
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 874 , 10 September 2019 , pp. 483 - 525
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© 2019 Cambridge University Press 

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Barbaca et al. supplementary movie 1

A forward-lit high-speed movie (1 kHz) of the oscillations in the cavity closure region observed in the large-scale experiment.

Download Barbaca et al. supplementary movie 1(Video)
Video 9.1 MB

Barbaca et al. supplementary movie 2

A back-lit high-speed movie (1 kHz) of the oscillations in the cavity closure region observed in the large-scale experiment.

Download Barbaca et al. supplementary movie 2(Video)
Video 9 MB

Barbaca et al. supplementary movie 3

A back-lit high-speed movie (50 kHz) containing the sequence of extracted frames presented in figure 5, showing the break-up and condensation of bubbly structures in the wake of a natural cavity.

Download Barbaca et al. supplementary movie 3(Video)
Video 2.6 MB

Barbaca et al. supplementary movie 4

A forward-lit high speed movie showing the cavity topology and dynamics observed in the small-scale experiment.

Download Barbaca et al. supplementary movie 4(Video)
Video 7.2 MB