Optimum Loss Factor for a Perfectly Matched Layer in Finite-Difference Time-Domain Acoustic Simulation

被引：7
|
作者：
Mokhtari, Parham [1 ]
Takemoto, Hironori [1 ]
Nishimura, Ryouichi [1 ]
Kato, Hiroaki [1 ]
机构：
[1] Natl Inst Informat & Commun Technol, Kyoto 6190288, Japan
来源：
IEEE TRANSACTIONS ON AUDIO SPEECH AND LANGUAGE PROCESSING | 2010年 / 18卷 / 05期
关键词：
Acoustic simulation; finite-difference time-domain (FDTD); perfectly matched layer (PML); MAXWELLS EQUATIONS; NUMERICAL-SOLUTION; ABSORPTIVE MEDIA; WAVES;
D O I：
10.1109/TASL.2009.2035036
中图分类号：
O42 [声学];
学科分类号：
070206 ; 082403 ;
摘要：
A perfectly matched layer (PML) is commonly used in finite-difference time-domain (FDTD) simulation to absorb outgoing waves and thereby reduce artifactual reflections from the computational domain boundaries. However, previous two-dimensional studies have noted that increasing the PML loss factor does not monotonically improve the PML's performance. This paper evaluates the PML in three-dimensional FDTD acoustic simulations. It confirms the existence of an optimum loss factor, with higher values degrading PML performance. An empirical formula is offered for estimating the optimum loss factor for a linear or a quadratic profile, that depends on the PML depth, sound speed, and grid resolution.
引用
收藏
页码：1068 / 1071
页数：4
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