Linear and nonlinear dimensionality reduction from fluid mechanics to machine learning

MA Mendez - Measurement Science and Technology, 2023 - iopscience.iop.org
Dimensionality reduction is the essence of many data processing problems, including
filtering, data compression, reduced-order modeling and pattern analysis. While traditionally …

Comparing different nonlinear dimensionality reduction techniques for data-driven unsteady fluid flow modeling

H Csala, S Dawson, A Arzani - Physics of Fluids, 2022 - pubs.aip.org
Computational fluid dynamics (CFD) is known for producing high-dimensional
spatiotemporal data. Recent advances in machine learning (ML) have introduced a myriad …

Nonlinear model reduction to fractional and mixed-mode spectral submanifolds

G Haller, B Kaszás, A Liu, J Axås - Chaos: An Interdisciplinary Journal …, 2023 - pubs.aip.org
ABSTRACT A primary spectral submanifold (SSM) is the unique smoothest nonlinear
continuation of a nonresonant spectral subspace E of a dynamical system linearized at a …

Physics-agnostic and physics-infused machine learning for thin films flows: modelling, and predictions from small data

CP Martin-Linares, YM Psarellis… - Journal of Fluid …, 2023 - cambridge.org
Numerical simulations of multiphase flows are crucial in numerous engineering applications,
but are often limited by the computationally demanding solution of the Navier–Stokes (NS) …

Manifold learning-based reduced-order model for full speed flow field

R Li, S Song - Physics of Fluids, 2024 - pubs.aip.org
Reduced-order models (ROMs) can effectively balance the accuracy and efficiency of
computational fluid dynamics (CFD). The nonlinear flow field characteristics cannot be …

Dynamics-augmented cluster-based network model

C Hou, N Deng, BR Noack - Journal of Fluid Mechanics, 2024 - cambridge.org
In this study we propose a novel data-driven reduced-order model for complex dynamics,
including nonlinear, multi-attractor, multi-frequency and multiscale behaviours. The starting …

Machine-learned control-oriented flow estimation for multi-actuator multi-sensor systems exemplified for the fluidic pinball

S Li, W Li, BR Noack - Journal of Fluid Mechanics, 2022 - cambridge.org
We propose the first machine-learned control-oriented flow estimation for multiple-input,
multiple-output plants. The starting point is constant actuation with open-loop actuation …

Prediction of pressure fields on cavitation hydrofoil based on improved compressed sensing technology

Y Sha, Y Xu, Y Wei, C Wang - Physics of Fluids, 2024 - pubs.aip.org
In the face of mounting economic constraints, researchers are increasingly turning to data-
driven methods for reconstructing unknown global fields from limited data. While traditional …

[HTML][HTML] Complete flow characterization from snapshot PIV, fast probes and physics-informed neural networks

ÁM Soto, A Güemes, S Discetti - Computer Methods in Applied Mechanics …, 2024 - Elsevier
Physics-informed neural networks (PINNs) are function approximators that can incorporate
physics laws during training. In recent years, PINNs have been shown to be capable of …

Features and mechanisms of asymmetric wake evolution downstream of two parallel circular cylinders

Y Yan, W Chen, Z Zhang, C Ji, N Srinil - Physics of Fluids, 2023 - pubs.aip.org
Uniform flow past side-by-side circular cylinders is a classical fluid dynamic model that
triggers rich phenomena, from which asymmetric wakes usually emerge. Such asymmetry …