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Acoustic invisibility in turbulent fluids by optimised cloaking

Published online by Cambridge University Press:  16 May 2014

Xun Huang ,
Siyang Zhong  and
Xin Liu
Xun Huang*
Affiliation:
State Key Laboratory of Turbulence and Complex Systems, Aeronautics and Astronautics, College of Engineering, Peking University, Beijing, 100871, China
Siyang Zhong
Affiliation:
State Key Laboratory of Turbulence and Complex Systems, Aeronautics and Astronautics, College of Engineering, Peking University, Beijing, 100871, China
Xin Liu
Affiliation:
State Key Laboratory of Turbulence and Complex Systems, Aeronautics and Astronautics, College of Engineering, Peking University, Beijing, 100871, China
*
†Email address for correspondence: huangxun@pku.edu.cn
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Abstract

Acoustic invisibility of a cloaking system in turbulent fluids is poorly understood. Here we show that evident scattering would appear in turbulent wakes due to the submergence of a classical cloaking device. The inherent physical mechanism is explained using our theoretical model, which eventually inspires us to develop an optimised cloaking approach. Both the near- and far-field scattered fields are examined using computational methods. The remarkably low scattering demonstrates the effectiveness of the proposed approach, in particular for acoustic cloaking in turbulent fluids.

JFM classification

Acoustics: Acoustics Acoustics: Aeroacoustics Acoustics: Waves in random media
Type
Papers
Information
Journal of Fluid Mechanics , Volume 749 , 25 June 2014 , pp. 460 - 477
Copyright
© 2014 Cambridge University Press 

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