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Title: Time-series learning of latent-space dynamics for reduced-order model closure

Journal Article · · Physica. D, Nonlinear Phenomena
 [1]; ORCiD logo [2];  [1];  [3];  [4]; ORCiD logo [2]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Argonne Leadership Computing Facility (ALCF)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Argonne Leadership Computing Facility (ALCF) and Mathematics and Computer Science Division

In this work, we study the performance of long short-term memory networks (LSTMs) and neural ordinary differential equations (NODEs) in learning latent-space representations of dynamical equations for an advection-dominated problem given by the viscous Burgers equation. Our formulation is devised in a nonintrusive manner with an equation-free evolution of dynamics in a reduced space with the latter being obtained through a proper orthogonal decomposition. In addition, we leverage the sequential nature of learning for both LSTMs and NODEs to demonstrate their capability for closure in systems that are not completely resolved in the reduced space. We assess our hypothesis for two advection-dominated problems given by the viscous Burgers equation. We observe that both LSTMs and NODEs are able to reproduce the effects of the absent scales for our test cases more effectively than does intrusive dynamics evolution through a Galerkin projection. This result empirically suggests that time-series learning techniques implicitly leverage a memory kernel for coarse-grained system closure as is suggested through the Mori–Zwanzig formalism.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Argonne Leadership Computing Facility (ALCF); Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21)
Grant/Contract Number:
89233218CNA000001; AC02-06CH11357
OSTI ID:
1597352
Report Number(s):
LA-UR--19-28714
Journal Information:
Physica. D, Nonlinear Phenomena, Journal Name: Physica. D, Nonlinear Phenomena Journal Issue: C Vol. 405; ISSN 0167-2789
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Turbulence forecasting via Neural ODE preprint January 2019
Meta-modeling strategy for data-driven forecasting preprint January 2020
Neural Closure Models for Dynamical Systems text January 2020
Stiff Neural Ordinary Differential Equations text January 2021