Lagrangian Data-Driven Reduced Order Modeling of Finite Time Lyapunov Exponents
Lagrangian Data-Driven Reduced Order Modeling of Finite Time Lyapunov Exponents
复制标题
有限时间 Lyapunov 指数的拉格朗日数据驱动降阶建模
DOI:
--
复制
发表时间:
2018
期刊:
影响因子:
--
通讯作者:
T. Iliescu
中科院分区:
文献类型:
--
作者:
Xuping Xie;Peter J. Nolan;S. Ross;T. Iliescu
There are two main strategies for improving the projection-based reduced order model (ROM) accuracy: (i) improving the ROM, i.e., adding new terms to the standard ROM; and (ii) improving the ROM basis, i.e., constructing ROM bases that yield more accurate ROMs. In this paper, we use the latter. We propose new Lagrangian inner products that we use together with Eulerian and Lagrangian data to construct new Lagrangian ROMs. We show that the new Lagrangian ROMs are orders of magnitude more accurate than the standard Eulerian ROMs, i.e., ROMs that use standard Eulerian inner product and data to construct the ROM basis. Specifically, for the quasi-geostrophic equations, we show that the new Lagrangian ROMs are more accurate than the standard Eulerian ROMs in approximating not only Lagrangian fields (e.g., the finite time Lyapunov exponent (FTLE)), but also Eulerian fields (e.g., the streamfunction). We emphasize that the new Lagrangian ROMs do not employ any closure modeling to model the effect of discarded modes (which is standard procedure for low-dimensional ROMs of complex nonlinear systems). Thus, the dramatic increase in the new Lagrangian ROMs' accuracy is entirely due to the novel Lagrangian inner products used to build the Lagrangian ROM basis.
登录
查看更多内容
DOI:
10.1016/j.jcp.2020.109789
发表时间:
2019-09
期刊:
J. Comput. Phys.
影响因子:
--
作者:
Jesse Chan
通讯作者:
Jesse Chan
DOI:
10.1137/17m1140571
发表时间:
2015-12
期刊:
SIAM J. Sci. Comput.
影响因子:
--
作者:
J. Reiss;P. Schulze;J. Sesterhenn;V. Mehrmann
通讯作者:
J. Reiss;P. Schulze;J. Sesterhenn;V. Mehrmann
影响因子:
16.6
作者:
M. Serra;Pratik Sathe;I. Rypina;A. Kirincich;S. Ross;Pierre FJ Lermusiaux;Arthur Allen;T. Peacock;G. Haller
通讯作者:
M. Serra;Pratik Sathe;I. Rypina;A. Kirincich;S. Ross;Pierre FJ Lermusiaux;Arthur Allen;T. Peacock;G. Haller
影响因子:
5.6
作者:
Nolan, Peter J.;Serra, Mattia;Ross, Shane D.
通讯作者:
Ross, Shane D.
DOI:
10.1080/10618562.2020.1723556
发表时间:
2020
影响因子:
1.3
作者:
Mou, Changhong;Liu, Honghu;Wells, David R.;Iliescu, Traian
通讯作者:
Iliescu, Traian