Enhanced alternating energy minimization methods for stochastic galerkin matrix equations
Enhanced alternating energy minimization methods for stochastic galerkin matrix equations
复制标题
随机伽辽金矩阵方程的增强交变能量最小化方法
DOI:
10.1007/s10543-021-00903-x
复制
发表时间:
2022
影响因子:
1.5
通讯作者:
Lee, Dongeun
中科院分区:
文献类型:
--
作者:
Lee, Kookjin;Elman, Howard C.;Powell, Catherine E.;Lee, Dongeun
In uncertainty quantification, it is commonly required to solve a forward model consisting of a partial differential equation (PDE) with a spatially varying uncertain coefficient that is represented as an affine function of a set of random variables, or parameters. Discretizing such models using stochastic Galerkin finite element methods (SGFEMs) leads to very high-dimensional discrete problems that can be cast as linear multi-term matrix equations (LMTMEs). We develop efficient computational methods for approximating solutions of such matrix equations in low rank. To do this, we follow an alternating energy minimization (AEM) framework, wherein the solution is represented as a product of two matrices, and approximations to each component are sought by solving certain minimization problems repeatedly. Inspired by proper generalized decomposition methods, the iterative solution algorithms we present are based on a rank-adaptive variant of AEM methods that successively computes a rank-one solution component at each step. We introduce and evaluate new enhancement procedures to improve the accuracy of the approximations these algorithms deliver. The efficiency and accuracy of the enhanced AEM methods is demonstrated through numerical experiments with LMTMEs associated with SGFEM discretizations of parameterized linear elliptic PDEs.
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DOI:
--
发表时间:
2020
期刊:
影响因子:
--
作者:
S. Pranesh
通讯作者:
S. Pranesh
影响因子:
4.3
作者:
D. Kressner;Petar Sirkovic
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影响因子:
1.5
作者:
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DOI:
10.1137/1.9780898718003
发表时间:
2003-05
期刊:
--
影响因子:
--
作者:
Y. Saad
通讯作者:
Y. Saad
DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
H. Elman;Darran G. Furnival
通讯作者:
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