Absorbing boundary condition vs. Perfectly matched layer (PML) on Acoustic FDTD model

Comparison of an absorbing boundary condition (ABC) vs. perfectly matched layer (PML) on the finite-difference time-domain (FDTD) model for acoustic wave propagation.

The ABC employs one dimensional advective form of acoustic wave equation. It requires quite small computational effort. But the ABC induces reflection of sound waves at the boundaries. In contrast, PML suppresses the reflection but it takes additional computational effort for the PML domain.

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