Accuracy controlled data assimilation for parabolic problems
Accuracy controlled data assimilation for parabolic problems
复制标题
抛物线问题的精度控制数据同化
DOI:
10.1090/mcom/3680
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发表时间:
2022
影响因子:
2
通讯作者:
Westerdiep, Jan
中科院分区:
文献类型:
--
作者:
Dahmen, Wolfgang;Stevenson, Rob;Westerdiep, Jan
This paper is concerned with the recovery of (approximate) solutions to parabolic problems from incomplete and possibly inconsistent observational data, given on a time-space cylinder that is a strict subset of the computational domain under consideration. Unlike previous approaches to this and related problems our starting point is a regularized least squares formulation in a continuous infinite-dimensional setting that is based on stable variational time-space formulations of the parabolic partial differential equation. This allows us to derive a priori as well as a posteriori error bounds for the recovered states with respect to a certain reference solution. In these bounds the regularization parameter is disentangled from the underlying discretization. An important ingredient for the derivation of a posteriori bounds is the construction of suitable Fortin operators which allow us to control oscillation errors stemming from the discretization of dual norms. Moreover, the variational framework allows us to contrive preconditioners for the discrete problems whose application can be performed in linear time, and for which the condition numbers of the preconditioned systems are uniformly proportional to that of the regularized continuous problem. In particular, we provide suitable stopping criteria for the iterative solvers based on the a posteriori error bounds. The presented numerical experiments quantify the theoretical findings and demonstrate the performance of the numerical scheme in relation with the underlying discretization and regularization. References
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影响因子:
2.1
作者:
Burman E;Oksanen L
通讯作者:
Oksanen L
影响因子:
2.1
作者:
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影响因子:
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作者:
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通讯作者:
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DOI:
--
发表时间:
--
期刊:
影响因子:
--
作者:
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通讯作者:
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DOI:
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发表时间:
2013
期刊:
影响因子:
--
作者:
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通讯作者:
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