Simulation of acoustic wave propagation in dispersive media with relaxation losses by using FDTD method with PML absorbing boundary condition

1999 ◽  
Vol 46 (1) ◽  
pp. 14-23 ◽  
Author(s):  
Xiaojuen Yuan ◽  
D. Borup ◽  
J. Wiskin ◽  
M. Berggren ◽  
S.A. Johnson
Keyword(s):  
Boundary Condition ◽  
Wave Propagation ◽  
Acoustic Wave ◽  
Fdtd Method ◽  
Absorbing Boundary Condition ◽  
Dispersive Media ◽  
Acoustic Wave Propagation ◽  
Absorbing Boundary

An absorbing boundary condition for acoustic-wave propagation using a mesh-free method

Geophysics ◽  
2016 ◽  
Vol 81 (4) ◽  
pp. T145-T154 ◽  
Author(s):  
Junichi Takekawa ◽  
Hitoshi Mikada
Keyword(s):  
Boundary Condition ◽  
Wave Propagation ◽  
Acoustic Wave ◽  
Boundary Conditions ◽  
Absorbing Boundary Conditions ◽  
Absorbing Boundary Condition ◽  
Acoustic Wave Propagation ◽  
Absorbing Boundary ◽  
Mesh Free ◽  
Mesh Free Method

We have developed an absorbing boundary condition for acoustic-wave propagation using a mesh-free method without sacrificing the flexibility of the mesh-free framework. When we simulate acoustic-wave propagation using a numerical method, artificial reflections from model edges induced by a truncated computational domain should be avoided. Although many absorbing boundary conditions have been developed, most of them have been based on a regular latticed alignment of grids or nodes, and the efficiency of such absorbing boundary conditions for irregular arrangement of grids or nodes has not been examined yet. We have studied the artificial reflections generated at the boundaries of a model for a mesh-free method, and we have proposed a novel approach for suppressing the artifacts. The method uses a hybrid approach with a transition zone, in which the wavefield is estimated by a weighted average of solutions from the one- and two-way wave equations. Numerical experiments indicate that the proposed method can provide good performance in suppression of the artificial edge reflections even for irregular distributions of calculation points in the vicinity of model edges.

A novel UPML FDTD absorbing boundary condition for dispersive media

2010 ◽  
Vol 20 (3) ◽  
pp. 511-527 ◽  
Author(s):  
Bing Wei ◽  
Shi-quan Zhang ◽  
Fei Wang ◽  
Debiao Ge
Keyword(s):  
Boundary Condition ◽  
Absorbing Boundary Condition ◽  
Dispersive Media ◽  
Absorbing Boundary
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