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Global mode visualisation in cavitating flows

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Venning, JA ORCID: 0000-0002-4097-2168, Giosio, DR ORCID: 0000-0002-4083-7791, Pearce, BW ORCID: 0000-0003-2189-5598 and Brandner, PA ORCID: 0000-0002-6721-878X 2018 , 'Global mode visualisation in cavitating flows', in J Katz (ed.), Proceedings of the 10th Symposium on Cavitation (CAV2018) , ASME, USA, pp. 485-490 , doi: 10.1115/1.861851_ch92.

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Abstract

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 Type: Conference Publication
Authors/Creators:Venning, JA and Giosio, DR and Pearce, BW and Brandner, PA
Keywords: cloud cavitation, frequency analysis, modal decomposition
Journal or Publication Title: Proceedings of the 10th Symposium on Cavitation (CAV2018)
Publisher: ASME
DOI / ID Number: 10.1115/1.861851_ch92
Copyright Information:

Copyright 2018 ASME

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