Perfectly matched layer for an elastic parabolic equation model in ocean acoustics
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- 作者：Chuanxiu Xu ; Haigang Zhang ; Shengchun Piao…
- 关键词：Key wordselastic parabolic equation ; perfectly matched layer ; artificial absorbing layer
- 刊名：Journal of Ocean University of China
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：16
- 期：1
- 页码：57-64
- 全文大小：
- 刊物主题：Oceanography; Meteorology;
- 出版者：Science Press
- ISSN：1993-5021
- 卷排序：16
文摘
The perfectly matched layer (PML) is an effective technique for truncating unbounded domains with minimal spurious reflections. A fluid parabolic equation (PE) model applying PML technique was previously used to analyze the sound propagation problem in a range-dependent waveguide (Lu and Zhu, 2007). However, Lu and Zhu only considered a standard fluid PE to demonstrate the capability of the PML and did not take improved one-way models into consideration. They applied a [1/1] Padé approximant to the parabolic equation. The higher-order PEs are more accurate than standard ones when a very large angle propagation is considered. As for range-dependent problems, the techniques to handle the vertical interface between adjacent regions are mainly energy conserving and single-scattering. In this paper, the PML technique is generalized to the higher order elastic PE, as is to the higher order fluid PE. The correction of energy conserving is used in range-dependent waveguides. Simulation is made in both acoustic cases and seismo-acoustic cases. Range-independent and range-dependent waveguides are both adopted to test the accuracy and efficiency of this method. The numerical results illustrate that a PML is much more effective than an artificial absorbing layer (ABL) both in acoustic and seismo-acoustic sound propagation modeling.