Improved Accuracy of Monotone Finite Difference Schemes on Point Clouds and Regular Grids

Improved Accuracy of Monotone Finite Difference Schemes on Point Clouds and Regular Grids
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提高点云和规则网格上单调有限差分格式的精度

DOI:
10.1137/18m1200269
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发表时间:
2018
期刊:
SIAM J. Sci. Comput.
影响因子:
--
通讯作者:
Adam M. Oberman
Adam M. Oberman
中科院分区:
--
文献类型:
--
作者:
Chris Finlay;Adam M. Oberman

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有限差分格式是求解非线性退化椭圆型偏微分方程的首选方法,因为Barles-Sougandis收敛框架[Barles和Sougandidis,Asymptotic Analysis,4(3):271-283,1991]提供了收敛到唯一粘性解的充分条件[Crandall,石井和Lions,Bull. Amer. Math Soc.,27(1):1-67,1992]。对于各向异性算子,例如Monge-Ampere方程,需要宽模板方案[Oberman,SIAM J. Numer.分析:44(2):879-895]。这些计划的精度取决于两个邻居的距离,$R$,和角分辨率,$d\θ $。在均匀网格上,精度为$\mathcal O(R^2 + d\theta)$。在点云上,最精确的方案是Froese的$\mathcal O(R + d\theta)$[Numerische Mathematik,138(1):75-99,2018]。在这项工作中,我们构造几何动机计划在这两种情况下更高的精度:为了$\mathcal O(R + d\theta^2)$上的点云,和$\mathcal O(R^2 + d\theta^2)$上的均匀网格。
Finite difference schemes are the method of choice for solving nonlinear, degenerate elliptic PDEs, because the Barles-Sougandis convergence framework [Barles and Sougandidis, Asymptotic Analysis, 4(3):271-283, 1991] provides sufficient conditions for convergence to the unique viscosity solution [Crandall, Ishii and Lions, Bull. Amer. Math Soc., 27(1):1-67, 1992]. For anisotropic operators, such as the Monge-Ampere equation, wide stencil schemes are needed [Oberman, SIAM J. Numer. Anal., 44(2):879-895]. The accuracy of these schemes depends on both the distances to neighbors, $R$, and the angular resolution, $d\theta$. On uniform grids, the accuracy is $\mathcal O(R^2 + d\theta)$. On point clouds, the most accurate schemes are of $\mathcal O(R + d\theta)$, by Froese [Numerische Mathematik, 138(1):75-99, 2018]. In this work, we construct geometrically motivated schemes of higher accuracy in both cases: order $\mathcal O(R + d\theta^2)$ on point clouds, and $\mathcal O(R^2 + d\theta^2)$ on uniform grids.
DOI: 10.1007/s00211-017-0898-2
发表时间: 2018
影响因子: 2.1
作者:
Froese, Brittany D.
通讯作者: Froese, Brittany D.
DOI: 10.1007/s10915-017-0586-5
发表时间: 2018-06-01
影响因子: 2.5
作者:
Hamfeldt, Brittany Froese;Salvador, Tiago
通讯作者: Salvador, Tiago