TY - EJOU
AU - Shen, Jianxin Zhu, Zengsi Chen, Zheqi
TI - The Mode Relation for Open Acoustic Waveguide Terminated by PML with Varied Sound Speed
T2 - Computer Modeling in Engineering \& Sciences
PY - 2012
VL - 83
IS - 5
SN - 1526-1506
AB - An acoustic waveguide with continuously varying sound speed is discussed in this paper. When the waveguide is open along the depth, the perfectly matched layer (PML) is used to terminate the infinite domain. Since the sound speed is gradually varied, the density is assumed as constant in each fluid layer. For this waveguide, it is shown that the mode relation is derived by using the differential transfer matrix method (DTMM). To solve leaky and PML modes, Newton's iteration is applied, and Chebyshev pseudospectral method is used for obtaining initial guesses. The solutions are with high accuracy.
KW - acoustic waveguide
KW - perfectly matched layer
KW - differential transfer matrix method
KW - Chebyshev pseudospectral method
KW - PML modes
KW - leaky modes
DO - 10.3970/cmes.2012.083.547