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Time Domain Acoustic Propagation Analysis Using 2-D Pseudo-spectral Modeling for Ocean Environment  

Kim Keesan (서울대학교 조선해양공학과)
Lee Keunhwa (서울대학교 조선해양공학과)
Seong Woojae (서울대학교 조선해양공학과)
Publication Information
The Journal of the Acoustical Society of Korea / v.23, no.8, 2004 , pp. 576-582 More about this Journal
Abstract
A computer code that is based on the Pseudo-spectral finite difference algorithm using staggered grid is developed for the wave propagation modeling in the time domain. The advantage of a finite difference approximation is that any geometrically complicated media can be modeled. Staggered grids are advantageous as it provides much more accuracy than using a regular grid. Pseudo-spectral methods are those that evaluate spatial derivatives by multiplying a wavenumber by the Fourier transform of a pressure wave-field and performing the inverse Fourier transform. This method is very stable and reduces memory and the number of computations. The synthetic results by this algorithm agree with the analytic solution in the infinite and half space. The time domain modeling was implemented in various models. such as half-space. Pekeris waveguide, and range dependent environment. The snapshots showing the total wave-field reveals the Propagation characteristic or the acoustic waves through the complex ocean environment.
Keywords
Wave equation; Pseudo-spectral method; Finite difference approximation; Staggered grid;
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