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arXiv 2006.13201math.NAcs.NA
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对流-扩散方程反问题的稳定化有限元法。II:对流主导型状态

A stabilized finite element method for inverse problems subject to the convection-diffusion equation. II: convection-dominated regime

Erik Burman, Mihai Nechita, Lauri Oksanen

摘要:

本文考虑定常对流-扩散方程不适定数据同化问题的数值逼近,并推广了[Numer.数学144,451- 477,2020]到对流主导的状态。稍微调整稳定的有限元法提出的主导扩散,我们利用局部误差分析,通过数据集的对流场的特性,获得准最佳收敛。将与离散解相乘的权函数取为Lipschitz,并证明了相应的超逼近结果(离散交换子性质)。数据扰动的影响包括在分析中,我们总结了一些数值实验的文件。

英文摘要:

We consider the numerical approximation of the ill-posed data assimilation problem for stationary convection-diffusion equations and extend our previous analysis in [Numer. Math. 144, 451--477, 2020] to the convection-dominated regime. Slightly adjusting the stabilized finite element method proposed for dominant diffusion, we draw upon a local error analysis to obtain quasi-optimal convergence along the characteristics of the convective field through the data set. The weight function multiplying the discrete solution is taken to be Lipschitz and a corresponding super approximation result (discrete commutator property) is proven. The effect of data perturbations is included in the analysis and we conclude the paper with some numerical experiments.

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