Dispersion of waves in two and three-dimensional periodic media
Dispersion of waves in two and three-dimensional periodic media
复制标题
波在二维和三维周期介质中的色散
DOI:
10.1080/17455030.2020.1810822
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发表时间:
2020
影响因子:
--
通讯作者:
Vainberg, Boris
中科院分区:
文献类型:
--
作者:
Godin, Yuri A.;Vainberg, Boris
We consider acoustic wave propagation through a periodic array of the inclusions of arbitrary shape. The inclusion size is much smaller than the array period while the wavelength is fixed. We derive and rigorously justify the dispersion relation for general frequencies and show that there are exceptional frequencies for which the solution is a cluster of waves propagating in different directions with different frequencies so that the dispersion relation cannot be defined uniquely. Examples are provided for the spherical inclusions.
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