Effect of compressibility and non-uniformity in flow on the scattering pattern of acoustic cloak

Abstract During the last decade, most of acoustic cloak research has been done within a theoretical framework in which the medium is at rest. However, such an acoustic cloak cannot preserve its unique properties or functions to make an object acoustically invisible in the presence of flow. In this s...

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Autores principales:	Hyeonbin Ryoo, Wonju Jeon
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1d19643a4d3b4c648da4b22a2c2c4837
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spelling	oai:doaj.org-article:1d19643a4d3b4c648da4b22a2c2c48372021-12-02T15:04:54ZEffect of compressibility and non-uniformity in flow on the scattering pattern of acoustic cloak10.1038/s41598-017-02143-y2045-2322https://doaj.org/article/1d19643a4d3b4c648da4b22a2c2c48372017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02143-yhttps://doaj.org/toc/2045-2322Abstract During the last decade, most of acoustic cloak research has been done within a theoretical framework in which the medium is at rest. However, such an acoustic cloak cannot preserve its unique properties or functions to make an object acoustically invisible in the presence of flow. In this study, we propose a theoretical framework to accurately investigate the effect of compressibility and non-uniformity in flow on the scattering pattern of acoustic cloak. In the formulation, the wave operator is coupled with the non-uniform velocity vector, and the equivalent source terms due to mean flow are divided into the compressibility effect and the non-uniformity effect with their own physical meanings. Numerical simulation shows the difference in far-field directivity between previous and present formulations. The polarity of the equivalent sources in the present formulation shows hexapole and skewed quadrupole patterns for non-uniformity and compressibility effects, respectively, and their magnitudes increase with power laws of Mach number as the Mach number increases. As an application, we make use of the present formulation for predicting the acoustic scattering from newly designed convective cloaks. The simulation results show better performance compared to the existing convective cloak.Hyeonbin RyooWonju JeonNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hyeonbin Ryoo Wonju Jeon Effect of compressibility and non-uniformity in flow on the scattering pattern of acoustic cloak
description	Abstract During the last decade, most of acoustic cloak research has been done within a theoretical framework in which the medium is at rest. However, such an acoustic cloak cannot preserve its unique properties or functions to make an object acoustically invisible in the presence of flow. In this study, we propose a theoretical framework to accurately investigate the effect of compressibility and non-uniformity in flow on the scattering pattern of acoustic cloak. In the formulation, the wave operator is coupled with the non-uniform velocity vector, and the equivalent source terms due to mean flow are divided into the compressibility effect and the non-uniformity effect with their own physical meanings. Numerical simulation shows the difference in far-field directivity between previous and present formulations. The polarity of the equivalent sources in the present formulation shows hexapole and skewed quadrupole patterns for non-uniformity and compressibility effects, respectively, and their magnitudes increase with power laws of Mach number as the Mach number increases. As an application, we make use of the present formulation for predicting the acoustic scattering from newly designed convective cloaks. The simulation results show better performance compared to the existing convective cloak.
format	article
author	Hyeonbin Ryoo Wonju Jeon
author_facet	Hyeonbin Ryoo Wonju Jeon
author_sort	Hyeonbin Ryoo
title	Effect of compressibility and non-uniformity in flow on the scattering pattern of acoustic cloak
title_short	Effect of compressibility and non-uniformity in flow on the scattering pattern of acoustic cloak
title_full	Effect of compressibility and non-uniformity in flow on the scattering pattern of acoustic cloak
title_fullStr	Effect of compressibility and non-uniformity in flow on the scattering pattern of acoustic cloak
title_full_unstemmed	Effect of compressibility and non-uniformity in flow on the scattering pattern of acoustic cloak
title_sort	effect of compressibility and non-uniformity in flow on the scattering pattern of acoustic cloak
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/1d19643a4d3b4c648da4b22a2c2c4837
work_keys_str_mv	AT hyeonbinryoo effectofcompressibilityandnonuniformityinflowonthescatteringpatternofacousticcloak AT wonjujeon effectofcompressibilityandnonuniformityinflowonthescatteringpatternofacousticcloak
_version_	1718389002419044352

Effect of compressibility and non-uniformity in flow on the scattering pattern of acoustic cloak

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