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Local nonreflecting boundary condition for time-dependent multiple scattering

机译:时变多重散射的局部非反射边界条件

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摘要

Starting from a high-order local nonreflecting boundary condition (NBC) for single scattering [25], we derive a local NBC for time-dependent multiple scattering problems in three space dimensions, which is completely local both in space and time. To do so, we first develop an exterior evaluation formula for a purely outgoing wave field, given its values and those of certain auxiliary functions needed for the local NBC at the artificial boundary. By combining that evaluation formula with the decomposition of the total scattered field into purely outgoing contributions, we obtain a completely local NBC for time-dependent multiple scattering problems. The accuracy and stability of this new local NBC are evaluated by coupling it to a standard finite difference method.
机译:从单次散射的高阶局部非反射边界条件(NBC)[25]开始,我们推导了三个时间维度上与时间相关的多重散射问题的局部NBC,这在空间和时间上都是局部的。为此,我们首先为纯输出波场开发一个外部评估公式,给出其值以及在人工边界处局部NBC所需的某些辅助函数的值。通过将评估公式与总散射场的分解分解为纯粹的外向贡献,我们获得了针对时间相关的多重散射问题的完全局部的NBC。通过将其耦合到标准有限差分方法,可以评估这种新的本地NBC的准确性和稳定性。

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