[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 …

Deep learning for reduced order modelling and efficient temporal evolution of fluid simulations

P Pant, R Doshi, P Bahl, A Barati Farimani - Physics of Fluids, 2021 - pubs.aip.org
Reduced order modeling (ROM) has been widely used to create lower order,
computationally inexpensive representations of higher-order dynamical systems. Using …

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 …

[HTML][HTML] Machine learning for nonintrusive model order reduction of the parametric inviscid transonic flow past an airfoil

SA Renganathan, R Maulik, V Rao - Physics of Fluids, 2020 - pubs.aip.org
Fluid flow in the transonic regime finds relevance in aerospace engineering, particularly in
the design of commercial air transportation vehicles. Computational fluid dynamics models …

Model reduction of convection-dominated partial differential equations via optimization-based implicit feature tracking

MA Mirhoseini, MJ Zahr - Journal of Computational Physics, 2023 - Elsevier
This work introduces a new approach to reduce the computational cost of solving partial
differential equations (PDEs) with convection-dominated solutions: model reduction with …

[HTML][HTML] Memory embedded non-intrusive reduced order modeling of non-ergodic flows

SE Ahmed, SM Rahman, O San, A Rasheed… - Physics of …, 2019 - pubs.aip.org
Generating a digital twin of any complex system requires modeling and computational
approaches that are efficient, accurate, and modular. Traditional reduced order modeling …

FastSVD-ML–ROM: A reduced-order modeling framework based on machine learning for real-time applications

GI Drakoulas, TV Gortsas, GC Bourantas… - Computer Methods in …, 2023 - Elsevier
Digital twins have emerged as a key technology for optimizing the performance of
engineering products and systems. High-fidelity numerical simulations constitute the …

Blood flow imaging by optimal matching of computational fluid dynamics to 4D‐flow data

J Töger, MJ Zahr, N Aristokleous… - Magnetic resonance …, 2020 - Wiley Online Library
Purpose Three‐dimensional, time‐resolved blood flow measurement (4D‐flow) is a powerful
research and clinical tool, but improved resolution and scan times are needed. Therefore …

A globally convergent method to accelerate large-scale optimization using on-the-fly model hyperreduction: application to shape optimization

T Wen, MJ Zahr - Journal of Computational Physics, 2023 - Elsevier
We present a numerical method to efficiently solve optimization problems governed by large-
scale nonlinear systems of equations, including discretized partial differential equations …

Time-series machine-learning error models for approximate solutions to parameterized dynamical systems

EJ Parish, KT Carlberg - Computer Methods in Applied Mechanics and …, 2020 - Elsevier
This work proposes a machine-learning framework for modeling the error incurred by
approximate solutions to parameterized dynamical systems. In particular, we extend the …