This paper discusses the acoustic mitigation properties of an air–water mixture excited by a monopole source. The numerical study reproduces a flat plate immersed in water and covered by an air film, acting as a sound barrier. This configuration mimics a mitigation device potentially in use for ship noise reduction, considering the flat plate as archetypal of a portion of the ship hull that works as a non-negligible scattering surface. The film, in this case, may also be used as an isolator with respect to the noise produced by the engines operating within the hull and propagating in the water. The study uses a homogeneous mixture model to reproduce the fluid dynamic field of air injected into the water. Once the air–water mixture is fully developed, the density and speed of sound distributions are extrapolated and used as input parameters for the acoustic propagation model. The monopole source exits the mixture layer, and the attenuation properties are assessed by recording the time signal on a probe positioned on the reflecting wall. The results show the difference in the transmission of acoustic pressure considering different frequencies and distributions of the mixture. These findings have significant practical implications, as they demonstrate how the air film can effectively attenuate the signal, with the mitigation effectiveness varying with the source's frequency and the distribution of the mixture of air and water in space.
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November 2024
Research Article|
November 01 2024
Numerical study of noise attenuation by air-sheet barriers in water Available to Purchase
Giovanni Petris
;
Giovanni Petris
a)
(Conceptualization, Data curation, Investigation, Methodology, Validation, Visualization, Writing – original draft)
Department of Engineering and Architecture, University of Trieste
, Piazzale Europa, 1, Trieste 34127, Italy
a)Author to whom correspondence should be addressed: [email protected]
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Naira Hamid
;
Naira Hamid
b)
(Conceptualization, Investigation, Methodology, Visualization, Writing – original draft)
Department of Engineering and Architecture, University of Trieste
, Piazzale Europa, 1, Trieste 34127, Italy
Search for other works by this author on:
Marta Cianferra
;
Marta Cianferra
b)
(Conceptualization, Methodology, Supervision, Writing – original draft, Writing – review & editing)
Department of Engineering and Architecture, University of Trieste
, Piazzale Europa, 1, Trieste 34127, Italy
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Vincenzo Armenio
Vincenzo Armenio
b)
(Conceptualization, Funding acquisition, Methodology, Supervision, Writing – review & editing)
Department of Engineering and Architecture, University of Trieste
, Piazzale Europa, 1, Trieste 34127, Italy
Search for other works by this author on:
Giovanni Petris
Conceptualization, Data curation, Investigation, Methodology, Validation, Visualization, Writing – original draft
a)
Department of Engineering and Architecture, University of Trieste
, Piazzale Europa, 1, Trieste 34127, Italy
Naira Hamid
Conceptualization, Investigation, Methodology, Visualization, Writing – original draft
b)
Department of Engineering and Architecture, University of Trieste
, Piazzale Europa, 1, Trieste 34127, Italy
Marta Cianferra
Conceptualization, Methodology, Supervision, Writing – original draft, Writing – review & editing
b)
Department of Engineering and Architecture, University of Trieste
, Piazzale Europa, 1, Trieste 34127, Italy
Vincenzo Armenio
Conceptualization, Funding acquisition, Methodology, Supervision, Writing – review & editing
b)
Department of Engineering and Architecture, University of Trieste
, Piazzale Europa, 1, Trieste 34127, Italy
a)Author to whom correspondence should be addressed: [email protected]
b)
Electronic addresses: [email protected]; [email protected]; and [email protected]
Physics of Fluids 36, 113306 (2024)
Article history
Received:
August 20 2024
Accepted:
October 10 2024
Citation
Giovanni Petris, Naira Hamid, Marta Cianferra, Vincenzo Armenio; Numerical study of noise attenuation by air-sheet barriers in water. Physics of Fluids 1 November 2024; 36 (11): 113306. https://doi.org/10.1063/5.0234150
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