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Global mode visualisation in cavitating flows
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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 |
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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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Item Statistics: | View statistics for this item |
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