Design method for an acoustic cloak in flows by topology optimization
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In this paper, a design method for an acoustic cloak in the presence of background mean flows is proposed by using topology optimization, which enables the associated fabrication of the cloaking design. The density-based topology optimization method is used to allocate the designated materials, thus providing the structure of the cloak. The optimization problem is efficiently solved with the gradient-based globally convergent method of moving asymptotes, which utilizes the derivative information from the finite element simulation studies of the linearized acoustic potential equation. This paper introduces the whole design method first then numerically demonstrates the corresponding performance, which shall constitute the main contribution of the present work.
KeywordsAeroacoustics Acoustic cloaking Topology optimization
This work was supported by the Beijing Municipal Science & Technology Commission (Grant Z181100001018030), the National Natural Science Foundation of China (Grant 11561130148) and the Newton Advanced Fellowship from the Royal Society (Ref. NA14081).