arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1101.0897math.NAcs.NA
收藏

匹配层的分析

The Analysis of Matched Layers

Université Paris XIII(巴黎第十三大学);University of Michigan(密歇根大学)

Laurence Halpern, Sabrina Petit-Bergez, Jeffrey Rauch

AI总结:

本文系统分析匹配层,特别是Bérenger方法,证明其适定性、完美匹配性,并给出导数损失的条件及非放大层构造。

摘要:

对匹配层进行了系统分析,特别关注更好地理解Bérenger的卓越方法。我们证明Bérenger层及密切相关的层在很大 generality 上定义了适定的传输问题。当Bérenger方法或其近亲适定时,证明了完美匹配。证明使用了能量法、Fourier-Laplace变换以及Laplace变换方程的实际坐标变换。证明了对于椭圆生成元,Bérenger方法不会出现导数损失。更一般地,证明了Bérenger方法中导数损失的一个本质必要且充分的条件。充分性依赖于带有伪微分乘子的能量法。通过几何光学计算识别了放大层和非放大层。在Maxwell方程的各种Bérenger算法中,我们偏好的选择导致一个强适定的增广系统,并且在很大 generality 上既完美又非放大。我们通过外推论证构建了一种替代的匹配层方法,该方法保留了原始问题的强双曲性,并且尽管不是完美匹配,但在所有入射角下主导反射系数为零。

英文摘要:

A systematic analysis of matched layers is undertaken with special attention to better understand the remarkable method of Bérenger. We prove that the Bérenger and closely related layers define well posed transmission problems in great generality. When the Bérenger method or one of its close relatives is well posed, perfect matching is proved. The proofs use the energy method, Fourier-Laplace transform, and real coordinate changes for Laplace transformed equations. It is proved that the loss of derivatives associated with the Bérenger method does not occur for elliptic generators. More generally, an essentially necessary and sufficient condition for loss of derivatives in Bérenger's method is proved. The sufficiency relies on the energy method with pseudodifferential multiplier. Amplifying and nonamplifying layers are identified by a geometric optics computation. Among the various flavors of Bérenger's algorithm for Maxwell's equations our favorite choice leads to a strongly well posed augmented system and is both perfect and nonamplifying in great generality. We construct by an extrapolation argument an alternative matched layer method which preserves the strong hyperbolicity of the original problem and though not perfectly matched has leading reflection coefficient equal to zero at all angles of incidence.

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。

↑