Spectral-Element Simulations of Acoustic Waves Induced by a Moving Underwater Source
Spectral-Element Simulations of Acoustic Waves Induced by a Moving Underwater Source
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移动水下源引起的声波的谱元模拟
DOI：
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发表时间：
2019
影响因子：
1.9
通讯作者：
J. Tromp
中科院分区：
文献类型：
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作者：
S. Lloyd;C. Jeong;H. N. Gharti;J. Vignola;J. Tromp
在这项研究中，我们基于谱元法 (SEM) 对三维 (3D) 水下环境中移动声源引起的声波进行了建模。数值实验是使用 SEM 软件包 SPECFEM3D_Cartesian 进行的，该软件包有利于流固耦合和吸收边界条件。本文提供的示例包括使用吸收边界截断的无界流体，以及基于域分解建模为流固耦合系统的浅水波导。在数值实验中，SEM 计算的压力与其分析对应的压力相匹配。模拟移动声源前后各点的压力 SEM 解显示出频移，即多普勒效应，与解析解相匹配。本文为基于无源声纳的移动声源检测领域做出了贡献，并解决了使用连续信号的移动源计算侧扫声纳生成的波响应的挑战。
In this study, we model acoustic waves induced by moving acoustic sources in three-dimensional (3D) underwater settings based on a spectral-element method (SEM). Numerical experiments are conducted using the SEM software package SPECFEM3D_Cartesian, which facilitates fluid–solid coupling and absorbing boundary conditions. Examples presented in this paper include an unbounded fluid truncated by using absorbing boundaries, and a shallow-water waveguide modeled as a fluid–solid coupled system based on domain decomposition. In the numerical experiments, the SEM-computed pressures match their analytical counterparts. SEM solutions of pressures at points behind and ahead of modeled moving acoustic sources show a frequency shift, i.e., a Doppler effect, which matches the analytical solution. This paper contributes to the field of passive sonar-based detection of moving acoustic sources, and addresses the challenge of computing wave responses generated by side-scan sonar by using moving sources of continuous signals.