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arXiv 1111.6287math.NAcs.NA
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两相类障碍物抛物问题的有限差分方法

A Finite Difference Method for Two-Phase Parabolic Obstacle-like Problem

Institute of mathematics, NAS of Armenia(亚美尼亚国家科学院数学研究所)

Avetik Arakelyan

AI总结:

针对两相类障碍物抛物问题,提出一种基于粘性解框架的投影Gauss-Seidel有限差分方法,并证明其收敛到唯一粘性解。

摘要:

本文研究两相类障碍物抛物问题的数值逼近:\[\Delta u -u_t =\lambda^+\cdot\chi_{\{u>0\}}-\lambda^-\cdot\chi_{\{u<0\}},\quad (t,x)\in (0,T)\times\Omega,\] 其中 $T < \infty$,$\lambda^+ ,\lambda^- > 0$ 是Lipschitz连续函数,$\Omega\subset\mathbb{R}^n$ 是有界区域。我们引入一种变分形式,从而定义粘性解的概念。利用所定义的粘性解框架,应用Barles-Souganidis理论。构造了数值投影Gauss-Seidel方法。尽管本文致力于两相类障碍物问题的抛物版本,但我们证明了离散格式对两相抛物类障碍物问题和标准两相膜问题均收敛到唯一粘性解。还给出了数值模拟。

英文摘要:

In this paper we treat the numerical approximation of the two-phase parabolic obstacle-like problem: \[Δu -u_t=λ^+\cdotχ_{\{u>0\}}-λ^-\cdotχ_{\{u<0\}},\quad (t,x)\in (0,T)\timesΩ,\] where $T < \infty, λ^+ ,λ^- > 0$ are Lipschitz continuous functions, and $Ω\subset\mathbb{R}^n$ is a bounded domain. We introduce a certain variational form, which allows us to define a notion of viscosity solution. We use defined viscosity solutions framework to apply Barles-Souganidis theory. The numerical projected Gauss-Seidel method is constructed. Although the paper is devoted to the parabolic version of the two-phase obstacle-like problem, we prove convergence of the discretized scheme to the unique viscosity solution for both two-phase parabolic obstacle-like and standard two-phase membrane problem. Numerical simulations are also presented.

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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