TY - JOUR
T1 - Spectral-Element Simulations of Acoustic Waves Induced by a Moving Underwater Source
AU - Lloyd, S. F.
AU - Jeong, C.
AU - Gharti, H. N.
AU - Vignola, J.
AU - Tromp, J.
N1 - Publisher Copyright:
© 2019 Institute for Theoretical and Computational Acoustics, Inc.
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019/9/1
Y1 - 2019/9/1
N2 - 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.
AB - 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.
KW - Doppler effect
KW - Spectral-element method
KW - moving underwater acoustic sources
KW - underwater acoustic wave responses
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U2 - 10.1142/S2591728518500408
DO - 10.1142/S2591728518500408
M3 - Article
AN - SCOPUS:85072962291
SN - 2591-7285
VL - 27
JO - Journal of Theoretical and Computational Acoustics
JF - Journal of Theoretical and Computational Acoustics
IS - 3
M1 - 1850040
ER -