Achieving acoustic cloak by using compressible background flow

doi:10.1088/1674-1056/25/8/084702

Abstract

We propose a scheme of acoustic spherical cloaking by means of background irrotational flow in compressible fluid. The background flow forms a virtual curved spacetime and directs the sound waves to bypass the cloaked objects. To satisfy the laws of real fluid, we show that spatially distributed mass source and momentum source are necessary to supply. The propagation of sound waves in this system is studied via both geometric acoustics approximation and full wave approach. The analytic solution of sound fields is obtained for plane wave incidence. The results reveal the effect of phase retardation (or lead) in comparison with the ordinary transformation-acoustic cloak. In addition, the ability of cloaking is also evaluated for unideal background flows by analyzing the scattering cross section.

Keywords: invisibility cloaking transformation acoustics compressible flow

Received: 01 March 2016
Revised: 10 April 2016
Accepted manuscript online:

PACS:	47.35.Rs	(Sound waves)
	47.40.-x	(Compressible flows; shock waves)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 11475088 and 11275024) and the Fund from the Ministry of Science and Technology of China (Grant No. 2013YQ030595-3).

Corresponding Authors: Mo-Lin Ge
E-mail: geml@nankai.edu.cn

Cite this article:

Ruo-Yang Zhang(张若洋), Qing Zhao(赵清), Mo-Lin Ge(葛墨林) Achieving acoustic cloak by using compressible background flow 2016 Chin. Phys. B 25 084702

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