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H-matrix based second moment analysis for rough random fields and finite element discretizations

机译:基于H矩阵的粗糙随机场和有限元离散的二阶矩分析

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摘要

We consider the efficient solution of strongly elliptic partial differential equations with random load based on the finite element method. The solution's two-point correlation can efficiently be approximated by means of an H- matrix, in particular if the correlation length is rather short or the correlation kernel is nonsmooth. Since the inverses of the finite element matrices which correspond to the differential operator under consideration can likewise efficiently be approximated in the H- matrix format, we can solve the correspondent H- matrix equation in essentially linear time by using the H -matrix arithmetic. Numerical experiments for three-dimensional finite element discretizations for several correlation lengths and different smoothness are provided. They validate the presented method and demonstrate that the computation times do not increase for nonsmooth or shortly correlated data.
机译:我们考虑了基于有限元方法的带随机载荷的强椭圆偏微分方程的有效解。解决方案的两点相关可以通过H矩阵有效地近似,尤其是在相关长度很短或相关内核不平滑的情况下。由于对应于所考虑的微分算子的有限元矩阵的逆可以以H矩阵格式有效地近似,因此我们可以使用H矩阵算法在基本上线性的时间内求解对应的H矩阵方程。提供了几种相关长度和不同平滑度的三维有限元离散化的数值实验。他们验证了所提出的方法并证明,对于不平滑或短相关的数据,计算时间不会增加。

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