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arXiv 1909.08598math.NAcs.NA
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奇摄动反应扩散方程的一阶系统最小二乘有限元

First-order system least squares finite-elements for singularly perturbed reaction-diffusion equations

James H. Adler, Scott MacLachlan, Niall Madden

摘要:

提出了一种新的奇摄动反应扩散方程的一阶系统最小二乘(FOSLS)有限元离散方法。这些问题的解决方案的特点层现象,并普遍存在于应用数学和建模的许多领域。有一个长期的历史发展的专门数值方案,其精确的数值逼近。我们遵循一个行之有效的做法,采用先验层适应网格,但与一种新的有限元法,产生一个对称的制定,同时也引起了所谓的“平衡”规范。我们证明了FOSLS弱形式的连续性和稳定性,提出了一个合适的分段均匀网格,并报告了数值实验的结果,证明了该方法的准确性和鲁棒性。

英文摘要:

We propose a new first-order-system least squares (FOSLS) finite-element discretization for singularly perturbed reaction-diffusion equations. Solutions to such problems feature layer phenomena, and are ubiquitous in many areas of applied mathematics and modelling. There is a long history of the development of specialized numerical schemes for their accurate numerical approximation. We follow a well-established practice of employing a priori layer-adapted meshes, but with a novel finite-element method that yields a symmetric formulation while also inducing a so-called "balanced" norm. We prove continuity and coercivity of the FOSLS weak form, present a suitable piecewise uniform mesh, and report on the results of numerical experiments that demonstrate the accuracy and robustness of the method.

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