Meshfree finite difference approximations for functions of the eigenvalues of the Hessian

Meshfree finite difference approximations for functions of the eigenvalues of the Hessian
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Hessian 特征值函数的无网格有限差分近似

DOI:
10.1007/s00211-017-0898-2
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发表时间:
2018
影响因子:
2.1
通讯作者:
Froese, Brittany D.
Froese, Brittany D.
中科院分区:
数学2区
文献类型:
--
作者:
Froese, Brittany D.

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我们引入无网格有限差分方法来逼近依赖于二阶方向导数或Hessian特征值的非线性椭圆算子。在非结构化点云上定义近似,这允许非常复杂的域和离散点的非均匀分布。格式是单调的,只要方程具有比较原理,就能保证格式收敛到方程的粘性解。数值实验表明,收敛性的各种方程,包括随机点云,复杂的区域,退化方程和奇异解的问题。
We introduce meshfree finite difference methods for approximating nonlinear elliptic operators that depend on second directional derivatives or the eigenvalues of the Hessian. Approximations are defined on unstructured point clouds, which allows for very complicated domains and a non-uniform distribution of discretisation points. The schemes are monotone, which ensures that they converge to the viscosity solution of the underlying PDE as long as the equation has a comparison principle. Numerical experiments demonstrate convergence for a variety of equations including problems posed on random point clouds, complex domains, degenerate equations, and singular solutions.
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