Continuous data assimilation reduced order models of fluid flow
Continuous data assimilation reduced order models of fluid flow
复制标题
流体流动的连续数据同化降阶模型
DOI:
10.1016/j.cma.2019.112596
复制
发表时间:
2019
影响因子:
7.2
通讯作者:
Iliescu, Traian
中科院分区:
文献类型:
--
作者:
Zerfas, Camille;Rebholz, Leo G.;Schneier, Michael;Iliescu, Traian
We propose, analyze, and test a novel continuous data assimilation reduced order model (DA-ROM) for simulating incompressible flows. While ROMs have a long history of success on certain problems with recurring dominant structures, they tend to lose accuracy on more complicated problems and over longer time intervals. Meanwhile, continuous data assimilation (DA) has recently been used to improve accuracy and, in particular, long time accuracy in fluid simulations by incorporating measurement data into the simulation. This paper synthesizes these two ideas, in an attempt to address inaccuracies in ROM by applying DA, especially over long time intervals and when only inaccurate snapshots are available. We prove that with a properly chosen nudging parameter, the proposed DA-ROM algorithm converges exponentially fast in time to the true solution, up to discretization and ROM truncation errors. Finally, we propose a strategy for nudging adaptively in time, by adjusting dissipation arising from the nudging term to better match true solution energy. Numerical tests confirm all results, and show that the DA-ROM strategy with adaptive nudging can be highly effective at providing long time accuracy in ROMs.
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DOI:
--
发表时间:
2018
期刊:
影响因子:
--
作者:
Xuping Xie;Peter J. Nolan;S. Ross;T. Iliescu
通讯作者:
T. Iliescu
影响因子:
3.9
作者:
Iliescu, Traian;Wang, Zhu
通讯作者:
Wang, Zhu
影响因子:
5
作者:
M. Benosman;J. Borggaard;O. San;B. Kramer
通讯作者:
B. Kramer
DOI:
10.1016/j.jcp.2016.05.037
发表时间:
2015-04
期刊:
J. Comput. Phys.
影响因子:
--
作者:
Maciej Balajewicz;I. Tezaur;E. Dowell
通讯作者:
Maciej Balajewicz;I. Tezaur;E. Dowell
影响因子:
4.1
作者:
Carlberg, Kevin;Barone, Matthew;Antil, Harbir
通讯作者:
Antil, Harbir