[HTML][HTML] Reduced-order modeling of advection-dominated systems with recurrent neural networks and convolutional autoencoders

R Maulik, B Lusch, P Balaprakash - Physics of Fluids, 2021 - pubs.aip.org
A common strategy for the dimensionality reduction of nonlinear partial differential equations
(PDEs) relies on the use of the proper orthogonal decomposition (POD) to identify a reduced …

An artificial neural network framework for reduced order modeling of transient flows

O San, R Maulik, M Ahmed - Communications in Nonlinear Science and …, 2019 - Elsevier
This paper proposes a supervised machine learning framework for the non-intrusive model
order reduction of unsteady fluid flows to provide accurate predictions of non-stationary state …

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

R Maulik, A Mohan, B Lusch, S Madireddy… - Physica D: Nonlinear …, 2020 - Elsevier
We study the performance of long short-term memory networks (LSTMs) and neural ordinary
differential equations (NODEs) in learning latent-space representations of dynamical …

Data-driven filtered reduced order modeling of fluid flows

X Xie, M Mohebujjaman, LG Rebholz, T Iliescu - SIAM Journal on Scientific …, 2018 - SIAM
We propose a data-driven filtered reduced order model (DDF-ROM) framework for the
numerical simulation of fluid flows. The novel DDF-ROM framework consists of two steps:(i) …

Neural network closures for nonlinear model order reduction

O San, R Maulik - Advances in Computational Mathematics, 2018 - Springer
Many reduced-order models are neither robust with respect to parameter changes nor cost-
effective enough for handling the nonlinear dependence of complex dynamical systems. In …

Physically constrained data‐driven correction for reduced‐order modeling of fluid flows

M Mohebujjaman, LG Rebholz… - International Journal for …, 2019 - Wiley Online Library
We have recently proposed a data‐driven correction reduced‐order model (DDC‐ROM)
framework for the numerical simulation of fluid flows, which can be formally written as …

On closures for reduced order models—A spectrum of first-principle to machine-learned avenues

SE Ahmed, S Pawar, O San, A Rasheed, T Iliescu… - Physics of …, 2021 - pubs.aip.org
For over a century, reduced order models (ROMs) have been a fundamental discipline of
theoretical fluid mechanics. Early examples include Galerkin models inspired by the Orr …

A hybrid projection/data-driven reduced order model for the Navier-Stokes equations with nonlinear filtering stabilization

M Girfoglio, A Quaini, G Rozza - Journal of Computational Physics, 2023 - Elsevier
Abstract We develop a Reduced Order Model (ROM) for the Navier-Stokes equations with
nonlinear filtering stabilization. Our approach, that can be interpreted as a Large Eddy …

A POD-Galerkin reduced order model for a LES filtering approach

M Girfoglio, A Quaini, G Rozza - Journal of Computational Physics, 2021 - Elsevier
Abstract We propose a Proper Orthogonal Decomposition (POD)-Galerkin based Reduced
Order Model (ROM) for an implementation of the Leray model that combines a two-step …

[HTML][HTML] Machine learning closures for model order reduction of thermal fluids

O San, R Maulik - Applied Mathematical Modelling, 2018 - Elsevier
We put forth a data-driven closure modeling approach for stabilizing projection based
reduced order models for the Bousinessq equations. The effect of discarded modes is taken …