COMPUTATIONAL MATERIAL DESIGN FOR ACOUSTIC CLOAKING

MENDEZ CARLOS; A E. HUESPE; J.M. PODESTA; J. OLIVER,

Crete Island, Greece

Conferencia; ECCOMAS Congress 2016 7th European Congress on Computational Methods in Applied Sciences and Engineering 5-10 June 2016,; 2016

ECCOMAS

Inspired by its electromagnetic counterpart, acoustic cloaking has been an active field of research in recentyears and now the theoretical background of what is called transformation acoustic (TA) is well established[1]. The ideal cloaking predicted by TA is for all frequencies and all directions; however, the feasibility ofreal devices is still under development because of the peculiar properties that are required for the constituentmaterials. With the help of topology optimization [2], in this work we show how these special (meta)materials can be designed. Specifically, we use topological derivative for the optimization and we considerquadrangular and hexagonal RVEs (representative volume elements). We also make the simulation of theacoustic wave propagation through the obstacle and we compare the effectiveness of the cloaking using thedesigned materials with theoretical predictions by the calculation of the scattering cross section. In addition,the influence of several parameters, like different sizes of the cloak or different materials for the obstacles,is analyzed.