Local on-surface radiation condition for multiple scattering of waves from convex obstacles

Local on-surface radiation condition for multiple scattering of waves from convex obstacles
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凸障碍物多次散射波的局部表面辐射条件

DOI:
10.1016/j.cma.2021.113697
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发表时间:
2021
影响因子:
7.2
通讯作者:
Acosta, Sebastián
Acosta, Sebastián
中科院分区:
工程技术1区
文献类型:
--
作者:
Acosta, Sebastián

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We propose a novel on-surface radiation condition to approximate the outgoing solution to the Helmholtz equation in the exterior of several impenetrable convex obstacles. Based on a local approximation of the Dirichlet-to-Neumann operator and a local formula for wave propagation, this new formulation simultaneously accounts for the outgoing behavior of the solution as well as the reflections arising from the multiple obstacles. The method involves tangential derivatives only, avoiding the use of integration over the surfaces of the obstacles. As a consequence, the method leads to sparse matrices and O (N) complexity. Numerical results are presented to illustrate the performance and limitations of the proposed formulation. Possible improvements and extensions are also discussed.
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