scholarly journals Acoustic Wave Propagation Modeling by a Two-dimensional Finite-difference Summation-by-parts Algorithm

2016 ◽  
Author(s):  
K. Kim ◽  
N. A. Petersson ◽  
A. Rodgers
Keyword(s):  
Wave Propagation ◽  
Finite Difference ◽  
Acoustic Wave ◽  
Two Dimensional ◽  
Acoustic Wave Propagation ◽  
Summation By Parts ◽  
Propagation Modeling ◽  
Wave Propagation Modeling

Application of the nearly perfectly matched layer in acoustic wave modeling

Geophysics ◽  
2007 ◽  
Vol 72 (5) ◽  
pp. SM169-SM175 ◽  
Author(s):  
Wenyi Hu ◽  
Aria Abubakar ◽  
Tarek M. Habashy
Keyword(s):  
Wave Propagation ◽  
Acoustic Wave ◽  
Computation Time ◽  
Velocity Model ◽  
Perfectly Matched Layer ◽  
Alternative Formulation ◽  
Acoustic Wave Propagation ◽  
Time Saving ◽  
Propagation Modeling ◽  
Wave Propagation Modeling

In this work, we successfully applied an alternative formulation of the perfectly matched layer (PML), the so-called nearly PML (NPML), to acoustic wave propagation modeling. The NPML formulation shows great advantages over the standard complex stretched coordinate PML. The NPML formulation deviates from the standard PML through an inexact variable change, but this fact only affects the wave behavior in the NPML layer, which is outside the region of interest. The equivalence of the wave-absorbing performance between these two PML formulations (the standard complex stretched coordinate PML formulation and the NPML formulation) in 3D Cartesian coordinates for acoustic wave propagation modeling is proved mathematically in this work. In time-domain methods, the advantages of the NPML over the standard PML were explained by both the analytical analysis and the numerical simulations in terms of implementation simplicity and computational efficiency. The computation time saving is up to 17% for the 2D example used in this work. For 3D problems, this computational saving is more significant. After theoretically analyzing the numerical reflections from the NPML and the standard PML, we concluded that these two PML formulations have exactly the same performance, even after spatial discretization. This conclusion is validated by numerical experiment. Finally, we tested the NPML in the Marmousi velocity model and found its wave-absorbing rate is high enough, even for this realistic structure.

Acoustic wave propagation in two dimensional sheared ducted flows

1997 ◽  
Author(s):  
E. Longatte ◽  
P. Lafon ◽  
S. Candel ◽  
E. Longatte ◽  
P. Lafon ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Acoustic Wave ◽  
Two Dimensional ◽  
Acoustic Wave Propagation
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