Data-driven modal decomposition methods as feature detection techniques for flow problems: A critical assessment

B Begiashvili, N Groun, J Garicano-Mena… - Physics of …, 2023 - pubs.aip.org
Modal decomposition techniques are showing a fast growth in popularity for their wide range
of applications and their various properties, especially as data-driven tools. There are many …

[HTML][HTML] Spectral proper orthogonal decomposition of compressor tip leakage flow

X He, Z Fang, G Rigas, M Vahdati - Physics of Fluids, 2021 - pubs.aip.org
To identify the spatiotemporal coherent structure of compressor tip leakage flow, spectral
proper orthogonal decomposition (SPOD) is performed on the near-tip flow field and the …

Estimation of cavitation velocity fields based on limited pressure data through improved U-shaped neural network

Y Xu, Y Sha, C Wang, Y Wei - Physics of Fluids, 2023 - pubs.aip.org
In marine applications, estimating velocity fields or other states from limited data are
important as it provides a reference for active control. In this work, we propose PVNet …

Steady and unsteady coupling in twin weakly underexpanded round jets

TYM Wong, MN Stavropoulos, JR Beekman… - Journal of Fluid …, 2023 - cambridge.org
We investigate the intermittency of the coupling behaviour in screeching twin round
supersonic jets at low Mach numbers across a range of nozzle spacings. Application of …

Gappy spectral proper orthogonal decomposition

A Nekkanti, OT Schmidt - Journal of Computational Physics, 2023 - Elsevier
Experimental spatio-temporal flow data often contain gaps or other types of undesired
artifacts. To reconstruct flow data in the compromised or missing regions, a data completion …

Spectral proper orthogonal decomposition using multitaper estimates

OT Schmidt - Theoretical and Computational Fluid Dynamics, 2022 - Springer
The use of multitaper estimates for spectral proper orthogonal decomposition (SPOD) is
explored. Multitaper and multitaper-Welch estimators that use discrete prolate spheroidal …

Bend-twist coupling effects on the cavitation behavior and hydroelastic response of composite hydrofoils

Y Liu, H Zhang, Q Wu, Z Yao, B Huang… - International Journal of …, 2023 - Elsevier
The objective of this work is to investigate the influence of bend-twist coupling effects on the
cavitation behavior and hydroelastic response of four hydrofoils with identical geometry: one …

Reduced-order variational mode decomposition to reveal transient and non-stationary dynamics in fluid flows

ZM Liao, Z Zhao, LB Chen, ZH Wan, NS Liu… - Journal of Fluid …, 2023 - cambridge.org
A novel data-driven modal analysis method, reduced-order variational mode decomposition
(RVMD), is proposed, inspired by the Hilbert–Huang transform and variational mode …

Time-and frequency-domain spectral proper orthogonal decomposition of a swirling jet by tomographic particle image velocimetry

X Zeng, Y Zhang, C He, Y Liu - Experiments in Fluids, 2023 - Springer
This study investigated the performance of proper orthogonal decomposition (POD), discrete
Fourier transformation (DFT), time-domain spectral proper orthogonal decomposition (td …

Neural-network learning of SPOD latent dynamics

A Lario, R Maulik, OT Schmidt, G Rozza… - Journal of Computational …, 2022 - Elsevier
We aim to reconstruct the latent space dynamics of high dimensional, quasi-stationary
systems using model order reduction via the spectral proper orthogonal decomposition …