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arXiv 1802.05904math.NAcs.NA
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二阶椭圆型偏微分方程最小二乘变分核方法的误差和稳定性估计

Error and Stability Estimates of a Least-Squares Variational Kernel-Based Method for Second Order Elliptic PDEs

Salar Seyednazari, Mehdi Tatari, Davoud Mirzaei

摘要:

本文研究了多维区域上二阶椭圆型偏微分方程的最小二乘变分核方法。在这种情况下,并不假设微分算子是自伴的或正定的,因为它应该在瑞利-里兹设置。然而,新的计划导致一个对称和正定的代数系统的方程。此外,所得到的方法不依赖于满足边界条件的某些子空间。用于离散化的试验空间是通过标准内核提供的,标准内核将索伯列夫空间复制为其原生空间。给出了该方法的误差分析,但该方法部分受制于边界上的逆不等式,这仍然是一个悬而未决的问题。最终线性系的条件数根据核的光滑性和离散质量来近似。最后,一些计算实验的结果支持理论误差界。

英文摘要:

We consider a least-squares variational kernel-based method for numerical solution of second order elliptic partial differential equations on a multi-dimensional domain. In this setting it is not assumed that the differential operator is self-adjoint or positive definite as it should be in the Rayleigh-Ritz setting. However, the new scheme leads to a symmetric and positive definite algebraic system of equations. Moreover, the resulting method does not rely on certain subspaces satisfying the boundary conditions. The trial space for discretization is provided via standard kernels that reproduce the Sobolev spaces as their native spaces. The error analysis of the method is given, but it is partly subjected to an inverse inequality on the boundary which is still an open problem. The condition number of the final linear system is approximated in terms of the smoothness of the kernel and the discretization quality. Finally, the results of some computational experiments support the theoretical error bounds.

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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