A higher-order FDTD technique for the implementation of enhanced dispersionless perfectly matched layers combined with efficient absorbing boundary conditions

1998 ◽  
Vol 34 (5) ◽  
pp. 2736-2739 ◽  
Author(s):  
N.V. Kantartzis ◽  
T.D. Tsiboukis
Keyword(s):  
Boundary Conditions ◽  
Higher Order ◽  
Absorbing Boundary Conditions ◽  
Perfectly Matched Layers ◽  
Absorbing Boundary ◽  
Matched Layers

scholarly journals A Comparative Study of Absorbing Layer Methods to Model Radiating Boundary Conditions for the Wave Propagation in Infinite Medium

2018 ◽  
Vol 7 (3.35) ◽  
pp. 25
Author(s):  
Ravi Shankar Badry ◽  
Maruthi Kotti ◽  
Pradeep Kumar Ramancharla
Keyword(s):  
Boundary Conditions ◽  
Absorbing Boundary Conditions ◽  
Computational Time ◽  
Perfectly Matched Layers ◽  
Implementation Cost ◽  
Absorbing Boundary ◽  
Propagating Waves ◽  
Unbounded Media ◽  
Absorbing Layer ◽  
Matched Layers

Radiating boundary condition is an important consideration in the finite element modelling of unbounded media. Absorbing layer techniquessuch as Perfectly Matched Layers (PML) and Absorbing Layers by Increasing Damping (ALID) becoming popular as they are efficient in absorbing outward propagating waves energy. In this study, a comparative analysis has been carried out between PML and ALID+VABC (Absorbing Boundary conditions for Viscoelastic materials) methods. The methods are analyzedusing LS-DYNAexplicit solver and the efficiency is compared with standard solutions.The study concluded that PML requires less number of elements to model the boundary conditions when compared with ALID+VABC. But PMLrequires a smaller element length which increases overall computational time. Both the methods are efficient in absorbing the wave energy. However, PML requires additional implementation cost to solve the complex equations. 

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