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arXiv 2102.03504math.NAcs.NA
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非光滑边界上右端奇异的Fredholm第二类积分方程的求解

Solving Fredholm second-kind integral equations with singular right-hand sides on non-smooth boundaries

Johan Helsing, Shidong Jiang

摘要:

本文给出了求解Fredholm第二类边界积分方程的一个数值格式,该方程的右端在有限集边界点处奇异.边界本身可能不平滑。该方案建立在递归压缩逆预处理(RCIP)的基础上,具有通用性,因为它与奇点的性质无关。强右手边奇点,如$1/|r|^α$,其中$α$接近于$1$,可以完全机器精度处理。自适应细化仅用于递归构造的预条件,导致离散化点的最佳数量和优越的稳定性,在解决阶段。通过几个数值例子,包括应用程序的积分方程来自线性化的BGKW动力学方程的稳定Couette流的计划的性能进行说明。

英文摘要:

A numerical scheme is presented for the solution of Fredholm second-kind boundary integral equations with right-hand sides that are singular at a finite set of boundary points. The boundaries themselves may be non-smooth. The scheme, which builds on recursively compressed inverse preconditioning (RCIP), is universal as it is independent of the nature of the singularities. Strong right-hand-side singularities, such as $1/|r|^α$ with $α$ close to $1$, can be treated in full machine precision. Adaptive refinement is used only in the recursive construction of the preconditioner, leading to an optimal number of discretization points and superior stability in the solve phase. The performance of the scheme is illustrated via several numerical examples, including an application to an integral equation derived from the linearized BGKW kinetic equation for the steady Couette flow.

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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