@Article{CiCP-31-2,
author = {Min, Cai and Kharazmi, Ehsan and Li, Changpin and Karniadakis, George, Em},
title = {Fractional Buffer Layers: Absorbing Boundary Conditions for Wave Propagation},
journal = {Communications in Computational Physics},
year = {2022},
volume = {31},
number = {2},
pages = {331--369},
abstract = {<p style="text-align: justify;">We develop fractional buffer layers (FBLs) to absorb propagating waves
without reflection in bounded domains. Our formulation is based on variable-order
spatial fractional derivatives. We select a proper variable-order function so that dissipation is induced to absorb the coming waves in the buffer layers attached to the
domain. In particular, we first design proper FBLs for the one-dimensional one-way
and two-way wave propagation. Then, we extend our formulation to two-dimensional
problems, where we introduce a consistent variable-order fractional wave equation. In
each case, we obtain the fully discretized equations by employing a spectral collocation
method in space and Crank-Nicolson or Adams-Bashforth method in time. We compare our results with a finely tuned perfectly matched layer (PML) method and show
that the proposed FBL is able to suppress reflected waves including corner reflections
in a two-dimensional rectangular domain. We also demonstrate that our formulation
is more robust and uses less number of equations.</p>},
issn = {1991-7120},
doi = {https://doi.org/10.4208/cicp.OA-2021-0063},
url = {https://global-sci.com/article/79515/fractional-buffer-layers-absorbing-boundary-conditions-for-wave-propagation}
}