An effective absorbing boundary algorithm for acoustical wave propagator  

作　　者：Lin Zhibin Lu Jing Xu Boling 

机构地区：[1]Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China

出　　处：《Progress in Natural Science:Materials International》2007年第9期1012-1017,共6页自然科学进展·国际材料（英文版）

基　　金：Supported by National Natural Science Foundation of China(Grant Nos.60340420325and10604030);the Research Fund for the Doctoral Program of Higher Education of China(Grant No.20040284038)

摘　　要：In this paper,Berenger's perfectly matched layer(PML)absorbing boundary condition for electromagnetic waves is introduced as the truncation area of the computational domain to absorb one-dimensional acoustic wave for the scheme of acoustical wave propagator(AWP).To guarantee the efficiency of the AWP algorithm,a regulated propagator matrix is derived in the PML medium.Numerical simulations of a Gaussian wave packet propagating in one-dimensional duct are carried out to illustrate the efficiency of the combination of PML and AWP.Compared with the traditional smoothing truncation windows technique of AWP,this scheme shows high computational accuracy in absorbing acoustic wave when the acoustical wave arrives at the computational edges.Optimal coefficients of the PML configurations are also discussed.In this paper, Berenger＇ s perfectly matched layer （PML） absorbing boundary condition for electromagnetic waves is introduced as the truncation area of the computational domain to absorb one-dimensional acoustic wave for the scheme of acoustical wave propagator （AWP）. To guarantee the efficiency of the AWP algorithm, a regulated propagator matrix is derived in the PML medium. Numerical simulations of a Gaussian wave packet propagating in one-dimensional duct are carried out to illustrate the efficiency of the combination of PML and AWP. Compared with the traditional smoothing truncation windows technique of AWP, this scheme shows high computational accuracy in absorbing acoustic wave when the acoustical wave arrives at the computational edges. Optimal coefficients of the PML configurations are also discussed.

关 键 词：acoustical wave propagator perfectly matched layer absorbing boundary conditions （ABC） 

分 类 号：O42[理学—声学]