Memoirs of the Faculty of Engineering, Okayama University
Published by Faculty of Enginerring, Okayama University

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Memoirs of the School of Engineering, Okayama University

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FDTD Simulations of Acoustic Waves in Two-DimensionalPhononic Crystals using Parallel Computer

Kurose Tomoyuki Graduate School of Natural Science and Technology Okayama University
鶴田 健二 Graduate School of Natural Science and Technology Okayama University ORCID Kaken ID publons researchmap
東辻 千枝子 Graduate School of Natural Science and Technology Okayama University
東辻 浩夫 Graduate School of Natural Science and Technology Okayama University
抄録
The finite-difference time-domain (FDTD) method has been applied to the calculation of the phonon band structure of two-dimensional (2D) phononic crystals, consisting of metal cylinders placed periodically in liquid. By comparing several combinations of materials for metal cylinder and liquid, we analyze the dependence of the band structures on sound speed and density of liquid media. Moreover, the negative refraction of the acoustic waves is observed at the interfaces between phononic crystal slab and the liquid. We find that an acoustic“lens effect”with the slab appears due to the negative refractions. The relationship between the focal intensity in the lens effect and the band structure is discussed.
ISSN
1349-6115
NCID
AA12014085
NAID