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Global mode visualisation in cavitating flows


Venning, JA and Giosio, DR and Pearce, BW and Brandner, PA, Global mode visualisation in cavitating flows, Proceedings of the 10th Symposium on Cavitation (CAV2018), 14-16 May 2018, Baltimore, Maryland, USA, pp. 485-490. ISBN 9780791861851 (2018) [Refereed Conference Paper]

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Copyright 2018 ASME

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DOI: doi:10.1115/1.861851_ch92


A technique for visualising global frequency modes and phasing information is presented using fast Fourier transforms applied to individual pixel intensities of high-speed photography image frames. A singular value decomposition is applied to the resulting complex data set to allow the application of windowing to the transforms. A high-speed image set of cloud cavitation about a sphere is used to demonstrate the technique and identify the dominant cavitation shedding modes. Three frequencies were found and the modal analysis show these to correspond to large-scale near symmetric shedding, intermediate-scale oblique shedding, and smallscale near symmetric shedding, respectively. Results obtained by the presented image analysis technique show close agreement to shedding frequencies obtained from pressure data.

Item Details

Item Type:Refereed Conference Paper
Keywords:cloud cavitation, frequency analysis, modal decomposition
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:Venning, JA (Dr James Venning)
UTAS Author:Giosio, DR (Dr Dean Giosio)
UTAS Author:Pearce, BW (Dr Bryce Pearce)
UTAS Author:Brandner, PA (Professor Paul Brandner)
ID Code:131934
Year Published:2018
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2019-04-12
Last Modified:2019-06-19

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