Koopman analysis by the dynamic mode decomposition in wind engineering
The Koopman theory, a concept to globally model nonlinear signals by a linear Hamiltonian,
has been at the frontier of fluid mechanics research for the last decade. Wind engineering …
has been at the frontier of fluid mechanics research for the last decade. Wind engineering …
Primary instability, sensitivity and active control of flow past two tandem circular cylinders
The tandem two-cylinder configuration is frequently employed in engineering structures. Its
fluid force and vortex shedding are significantly greater than those of widely studied single …
fluid force and vortex shedding are significantly greater than those of widely studied single …
A parametric and feasibility study for data sampling of the dynamic mode decomposition: range, resolution, and universal convergence states
Scientific research and engineering practice often require the modeling and decomposition
of nonlinear systems. The dynamic mode decomposition (DMD) is a novel Koopman-based …
of nonlinear systems. The dynamic mode decomposition (DMD) is a novel Koopman-based …
Machine-learning prediction of aerodynamic damping for buildings and structures undergoing flow-induced vibrations
Aerodynamic damping, as the principal determinant of wind-induced vibrations, bears vast
significance in building engineering. This study presents a new modular framework, called …
significance in building engineering. This study presents a new modular framework, called …
Laminar flow over a rectangular cylinder experiencing torsional flutter: Dynamic response, forces and coherence modes
This study investigates the flutter response of a rectangular cylinder model with an aspect
ratio of 5 at the Reynolds number Re= 100 via direct numerical simulation. The effects of two …
ratio of 5 at the Reynolds number Re= 100 via direct numerical simulation. The effects of two …
A POD-DMD augmented procedure to isolating dominant flow field features in a street canyon
This work develops a data analysis procedure, namely, proper orthogonal decomposition
(POD)-dynamic mode decomposition (DMD) augmented analysis, to isolate the energy-and …
(POD)-dynamic mode decomposition (DMD) augmented analysis, to isolate the energy-and …
Best practice guidelines for the dynamic mode decomposition from a wind engineering perspective
This paper distills the serial work of Li et al., 2020a, Li et al., 2021, Li et al., 2022a, Li et al.,
2022b, Li et al., 2022c, Li et al., 2023a, Li et al., 2023b into a practice guide for the Dynamic …
2022b, Li et al., 2022c, Li et al., 2023a, Li et al., 2023b into a practice guide for the Dynamic …
CFD-and BPNN-based investigation and prediction of air pollutant dispersion in urban environment
This study employed a Computational Fluid Dynamics (CFD)-based back propagation
neural network (BPNN) to investigate and predict the pollutant dispersion in an ideal urban …
neural network (BPNN) to investigate and predict the pollutant dispersion in an ideal urban …
The linear-time-invariance notion to the Koopman analysis: The architecture, pedagogical rendering, and fluid–structure association
This work augments a Linear-Time-Invariance (LTI) notion to the Koopman analysis, finding
an invariant subspace on which consistent Koopman modes are expanded with fluid …
an invariant subspace on which consistent Koopman modes are expanded with fluid …
Decoupling bi-directional fluid–structure interactions by the Koopman theory: Actualizing one-way subcases and the role of crosswind structure motion
We propose a novel thinking of decoupling bi-directional fluid–structure interactions (bi-FSI)
into simpler mono-directional components for analytical insights. The decoupling aims to …
into simpler mono-directional components for analytical insights. The decoupling aims to …