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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
Related URLs:	Google Scholar: Venning, JA UTAS Profile: Venning, JA Google Scholar: Giosio, DR Google Scholar: Pearce, BW UTAS Profile: Pearce, BW Google Scholar: Brandner, PA UTAS Profile: Brandner, PA
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