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arXiv 2107.09797math.NAcs.NA
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二维大波数Helmholtz方程基于近似波方向的平面波方法

A plane wave method based on approximate wave directions for two dimensional Helmholtz equations with large wave numbers

Qiya Hu, Zezhong Wang

摘要:

本文提出并分析了变波数Helmholtz方程几何光学解中波向的高精度计算方法。然后我们定义了一个“自适应”的小维平面波空间,其中每个平面波基函数由这样一个近似的波方向确定。我们建立了一个最佳的$L^2$近似的平面波空间的分析解齐次亥姆霍兹方程的大波数和报告的一些数值结果来说明所提出的方法的效率。

英文摘要:

In this paper we present and analyse a high accuracy method for computing wave directions defined in the geometrical optics ansatz of Helmholtz equation with variable wave number. Then we define an "adaptive" plane wave space with small dimensions, in which each plane wave basis function is determined by such an approximate wave direction. We establish a best $L^2$ approximation of the plane wave space for the analytic solutions of homogeneous Helmholtz equations with large wave numbers and report some numerical results to illustrate the efficiency of the proposed method.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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