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Wavelet analysis techniques in cavitating flows

Citation

Brandner, PA and Venning, JA and Pearce, BW, Wavelet analysis techniques in cavitating flows, Philosophical Transactions A, 376, (2126) Article 20170242. ISSN 1364-503X (2018) [Refereed Article]

Copyright Statement

Copyright 2018 The Authors

DOI: doi:10.1098/rsta.2017.0242

Abstract

Cavitating and bubbly flows involve a host of physical phenomena and processes ranging from nucleation, surface and interfacial effects, mass transfer via diffusion and phase change to macroscopic flow physics involving bubble dynamics, turbulent flow interactions and two-phase compressible effects. The complex physics that result from these phenomena and their interactions make for flows that are difficult to investigate and analyse. From an experimental perspective, evolving sensing technology and data processing provide opportunities for gaining new insight and understanding of these complex flows, and the continuous wavelet transform (CWT) is a powerful tool to aid in their elucidation. Five case studies are presented involving many of these phenomena in which the CWT was key to data analysis and interpretation. A diverse set of experiments are presented involving a range of physical and temporal scales and experimental techniques. Bubble turbulent break-up is investigated using hydroacoustics, bubble dynamics and high-speed imaging; microbubbles are sized using light scattering and ultrasonic sensing, and large-scale coherent shedding driven by various mechanisms are analysed using simultaneous high-speed imaging and physical measurement techniques. The experimental set-up, aspect of cavitation being addressed, how the wavelets were applied, their advantages over other techniques and key findings are presented for each case study.

Item Details

Item Type:Refereed Article
Keywords:cavitation, nucleation, bubble dynamics, wavelets
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Ship and Platform Hydrodynamics
Objective Division:Defence
Objective Group:Defence
Objective Field:Navy
UTAS Author:Brandner, PA (Professor Paul Brandner)
UTAS Author:Venning, JA (Dr James Venning)
UTAS Author:Pearce, BW (Dr Bryce Pearce)
ID Code:129159
Year Published:2018
Web of Science® Times Cited:2
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2018-11-13
Last Modified:2018-12-14
Downloads:0

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