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关于 $p$-双调和与 $\infty$-双调和函数的数值近似

On the numerical approximation of $p$-Biharmonic and $\infty$-Biharmonic functions

University of Reading(雷丁大学)

Nikos Katzourakis, Tristan Pryer

AI总结:

本文提出一种数值方法用于研究 $\infty$-双调和函数的性质,设计了 $p$-双调和方程的混合有限元方案,并证明了数值解收敛到弱解,且能处理 $p\to\infty$ 的极限情况。

摘要:

在[KP16]中,作者引入了在 $L^{\infty}$ 中的二阶变分问题。所关联的方程,称为 $\infty$-双调和方程,是一个三阶非线性偏微分方程,形式为 $Δ^2_\infty u\, := (Δu)^3 | D (Δu) |^2 = 0$。本文构建了数值方法以量化该问题的解性质,称为 $\infty$-双调和函数。对于固定的 $p$,我们设计了混合有限元方案用于预限制方程,即 $p$-双调和方程 $Δ^2_p u\, := Δ(| Δu |^{p-2} Δu) = 0$。我们证明了数值解收敛到 $Δ^2_p u = 0$ 的弱解,并展示了能够处理 $p\to\infty$ 的极限。我们进行了多种测试以理解 $Δ^2_\infty u$ 的解性质,并在1维情况下证明了我们的离散化方法收敛到该问题的适当弱解概念,即 $\mathcal D$-解。

英文摘要:

In [KP16] (arXiv:1605.07880) the authors introduced a second-order variational problem in $L^{\infty}$. The associated equation, coined the $\infty$-Bilaplacian, is a \emph{third order} fully nonlinear PDE given by $Δ^2_\infty u\, := (Δu)^3 | D (Δu) |^2 = 0.$ In this work we build a numerical method aimed at quantifying the nature of solutions to this problem which we call $\infty$-Biharmonic functions. For fixed $p$ we design a mixed finite element scheme for the pre-limiting equation, the $p$-Bilaplacian $Δ^2_p u\, := Δ(| Δu |^{p-2} Δu) = 0.$ We prove convergence of the numerical solution to the weak solution of $Δ^2_p u = 0$ and show that we are able to pass to the limit $p\to\infty$. We perform various tests aimed at understanding the nature of solutions of $Δ^2_\infty u$ and in 1-$d$ we prove convergence of our discretisation to an appropriate weak solution concept of this problem, that of $\mathcal D$-solutions.

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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