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arXiv 0912.0180math.NAcs.NA
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关于不定亥姆霍兹方程:复拉伸吸收边界层、迭代分析与预处理

On the indefinite Helmholtz equation: complex stretched absorbing boundary layers, iterative analysis, and preconditioning

University of Antwerp(安特卫普大学)

Bram Reps, Wim Vanroose, Hisham bin Zubair

AI总结:

本文研究并分析了针对基于复坐标拉伸的吸收边界层亥姆霍兹问题的预处理Krylov求解器,通过引入内部区域复坐标的预处理子实现多重网格可逆性,并基于特征值进行数值分析与实验验证。

摘要:

本文研究并分析了针对基于复坐标拉伸的吸收边界层亥姆霍兹问题的预处理Krylov求解器。预处理子是一个亥姆霍兹问题,其中不仅吸收层中的坐标具有虚部,内部区域中的坐标也具有虚部。这导致预处理子问题可通过多重网格循环求逆。我们基于特征值进行了数值分析,并通过多个数值实验评估了性能。该方法是复平移拉普拉斯算子的替代方案,在所研究的模型问题上表现出可比的性能。

英文摘要:

This paper studies and analyzes a preconditioned Krylov solver for Helmholtz problems that are formulated with absorbing boundary layers based on complex coordinate stretching. The preconditioner problem is a Helmholtz problem where not only the coordinates in the absorbing layer have an imaginary part, but also the coordinates in the interior region. This results into a preconditioner problem that is invertible with a multigrid cycle. We give a numerical analysis based on the eigenvalues and evaluate the performance with several numerical experiments. The method is an alternative to the complex shifted Laplacian and it gives a comparable performance for the studied model problems.

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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