Recent advances in feature extraction techniques for high-speed flowfields

S Unnikrishnan - Progress in Aerospace Sciences, 2023 - Elsevier
Abstract Space–time scale-resolved diagnostic and computational campaigns routinely
produce high-fidelity multi-disciplinary truth-model quality datasets for complex …

Krylov methods for large-scale dynamical systems: Application in fluid dynamics

RAS Frantz, JC Loiseau… - Applied …, 2023 - asmedigitalcollection.asme.org
In fluid dynamics, predicting and characterizing bifurcations, from the onset of unsteadiness
to the transition to turbulence, is of critical importance for both academic and industrial …

Data-driven resolvent analysis

B Herrmann, PJ Baddoo, R Semaan… - Journal of Fluid …, 2021 - cambridge.org
Resolvent analysis identifies the most responsive forcings and most receptive states of a
dynamical system, in an input–output sense, based on its governing equations. Interest in …

Kernel learning for robust dynamic mode decomposition: linear and nonlinear disambiguation optimization

PJ Baddoo, B Herrmann… - Proceedings of the …, 2022 - royalsocietypublishing.org
Research in modern data-driven dynamical systems is typically focused on the three key
challenges of high dimensionality, unknown dynamics and nonlinearity. The dynamic mode …

An invitation to resolvent analysis

LV Rolandi, JHM Ribeiro, CA Yeh, K Taira - … and Computational Fluid …, 2024 - Springer
Resolvent analysis is a powerful tool that can reveal the linear amplification mechanisms
between the forcing inputs and the response outputs about a base flow. These mechanisms …

On the role of nonlinear correlations in reduced-order modelling

JL Callaham, SL Brunton, JC Loiseau - Journal of Fluid Mechanics, 2022 - cambridge.org
This work investigates nonlinear dimensionality reduction as a means of improving the
accuracy and stability of reduced-order models of advection-dominated flows. Nonlinear …

Global stability analysis of full-aircraft transonic buffet at flight Reynolds numbers

A Sansica, A Hashimoto - AIAA Journal, 2023 - arc.aiaa.org
Fully three-dimensional (3D) global stability analysis (GSA) is performed on the NASA
Common Research Model at turbulent transonic buffet conditions. The framework here …

Compressibility effects on the secondary instabilities of the circular cylinder wake

LV Rolandi, J Fontane, T Jardin, J Gressier… - Journal of Fluid …, 2023 - cambridge.org
With a growing interest in low Reynolds number compressible flows, compressibility effects
on the secondary instabilities develo** on the circular cylinder periodic wake are …

A robust approach for stability analysis of complex flows using high-order Navier-Stokes solvers

R Ranjan, S Unnikrishnan, D Gaitonde - Journal of Computational Physics, 2020 - Elsevier
Global stability modes of flows provide significant insight into their dynamics. Direct methods
to obtain these modes are restricted by the daunting sizes and complexity of Jacobians …

Influence of freestream turbulence on the flow over a wall roughness

MA Bucci, S Cherubini, JC Loiseau, JC Robinet - Physical Review Fluids, 2021 - APS
The effect of freestream turbulence on the dynamics of an incompressible flow past a
cylindrical roughness element in subcritical conditions (ie, for Reynolds numbers below the …