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Noise from sub-boundary layer steps

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conference contribution
posted on 2023-05-23, 09:50 authored by Doolan, CJ, Moreau, DJ, Paul BrandnerPaul Brandner, Bryce PearceBryce Pearce, De Graaf, KL
Flow-induced noise data has been obtained under a wide range of conditions for a forward-backward sub-boundary layer steppair, using both hydroacoustic and aeroacoustic experimental facilities. The unscaled noise data show that sound generation behaves similarly in air and water. A non-dimensional analysis was used to develop scaling laws of the noise generation process. Appropriate scaling shows the results from each facility collapse when the wavelength of sound is approximately lower than the dimensions of the hydroacoustic facility test section. Noise was found to radiate in both cross-stream and streamwise directions, thus suggesting that a new noise generation model is required for these types of steps. Noise scaled with velocity raised to a power of seven, in agreement with previous forward facing sub-boundary layer step experiments.


Publication title

Proceedings of the 19th Australasian Fluid Mechanics Conference


H Chowdhury & F Alam






Australian Maritime College


RMIT University

Place of publication

Melbourne, Australia

Event title

19th Australasian Fluid Mechanics Conference

Event Venue

Melbourne, Australia

Date of Event (Start Date)


Date of Event (End Date)


Rights statement

Copyright 2014 Australasian Fluids Mechanics Society

Repository Status

  • Open

Socio-economic Objectives

Nautical equipment