Operator inference for non-intrusive model reduction of systems with non-polynomial nonlinear terms
Journal Article
·
· Computer Methods in Applied Mechanics and Engineering
- Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg (Germany); Univ. of California, San Diego, CA (United States)
- Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg (Germany)
- Univ. of California, San Diego, CA (United States)
- New York Univ. (NYU), NY (United States)
- Univ. of Texas, Austin, TX (United States)
Here in this work we present a non-intrusive model reduction method to learn low-dimensional models of dynamical systems with non-polynomial nonlinear terms that are spatially local and that are given in analytic form. In contrast to state-of-the-art model reduction methods that are intrusive and thus require full knowledge of the governing equations and the operators of a full model of the discretized dynamical system, the proposed approach requires only the non-polynomial terms in analytic form and learns the rest of the dynamics from snapshots computed with a potentially black-box full-model solver. The proposed method learns operators for the linear and polynomially nonlinear dynamics via a least-squares problem, where the given non-polynomial terms are incorporated on the right-hand side. The least-squares problem is linear and thus can be solved efficiently in practice. The proposed method is demonstrated on three problems governed by partial differential equations, namely the diffusion–reaction Chafee–Infante model, a tubular reactor model for reactive flows, and a batch-chromatography model that describes a chemical separation process. The numerical results provide evidence that the proposed approach learns reduced models that achieve comparable accuracy as models constructed with state-of-the-art intrusive model reduction methods that require full knowledge of the governing equations.
- Research Organization:
- New York Univ. (NYU), NY (United States); Univ. of Texas, Austin, TX (United States)
- Sponsoring Organization:
- Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF); US Air Force Center of Excellence; USDOE; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
- Grant/Contract Number:
- SC0019303; SC0019334
- OSTI ID:
- 1853047
- Alternate ID(s):
- OSTI ID: 1670814
- Journal Information:
- Computer Methods in Applied Mechanics and Engineering, Journal Name: Computer Methods in Applied Mechanics and Engineering Journal Issue: C Vol. 372; ISSN 0045-7825
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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