Use of eddy viscosity in resolvent analysis of turbulent channel flow

S Symon, A Madhusudanan, SJ Illingworth, I Marusic - Physical Review Fluids, 2023 - APS
The predictions obtained from resolvent analysis with and without an eddy viscosity model
for turbulent channel flow at Re τ= 550 are compared to direct numerical simulation data to …

Energy transfer in turbulent channel flows and implications for resolvent modelling

S Symon, SJ Illingworth, I Marusic - Journal of Fluid Mechanics, 2021 - cambridge.org
We analyse the inter-scale transfer of energy for two types of plane Poiseuille flow: the P4U
exact coherent state of Park & Graham (J. Fluid Mech., vol. 782, 2015, pp. 430–454) and …

Characterization of energy transfer and triadic interactions of coherent structures in turbulent wakes

DK Kinjangi, D Foti - Journal of Fluid Mechanics, 2023 - cambridge.org
Turbulent wakes are often characterized by dominant coherent structures over disparate
scales. Dynamics of their behaviour can be attributed to interscale energy dynamics and …

Extended spectral proper orthogonal decomposition for analysis of correlated surrounding flow structures and wind load components of a building

B Zhang, L Zhou, KT Tim, L Wang, J Niu… - Journal of Wind …, 2023 - Elsevier
Proper orthogonal decomposition (POD) has been used in numerous studies in wind
engineering to extract key features of a building's surrounding flow field and surface …

Mode-to-mode nonlinear energy transfer in turbulent channel flows

J Ding, D Chung, SJ Illingworth - Journal of Fluid Mechanics, 2025 - cambridge.org
We investigate nonlinear energy transfer for channel flows at friction Reynolds numbers. The
key feature of the analysis is that we quantify the energy transferred from a source mode to a …

[HTML][HTML] Mesh-free hydrodynamic stability

T Chu, OT Schmidt - Journal of Computational Physics, 2024 - Elsevier
A specialized mesh-free radial basis function-based finite difference (RBF-FD) discretization
is used to solve the large eigenvalue problems arising in hydrodynamic stability analyses of …

Passive stabilization of crossflow instabilities by a reverse lift-up effect

J Casacuberta, S Hickel, M Kotsonis - Physical Review Fluids, 2024 - APS
A novel mechanism is identified, through which a spanwise-invariant surface feature (a two-
dimensional forward-facing step) significantly stabilizes the stationary crossflow instability of …

Energy exchanges in the flow past a cylinder with a leeward control rod

N Biswas, MM Cicolin, ORH Buxton - Journal of Fluid Mechanics, 2022 - cambridge.org
We study the energy exchanges between coherent structures and the mean flow in the wake
of a cylinder in the presence of a leeward control rod using particle image velocimetry data …

Hysteresis of two-dimensional flows around a NACA0012 airfoil at Re= 5000 and linear analyses of their mean flow.

O Marquet, JS Leontini, J Zhao… - International Journal of …, 2022 - Elsevier
Two-dimensional numerical simulations of the flow around a NACA0012 profile at Reynolds
number Re= 5000 show that unsteady periodic flows reach different saturated states when …

Nonlinear dynamics of vortex pairing in transitional jets

A Nekkanti, T Colonius, OT Schmidt - arXiv preprint arXiv:2407.16851, 2024 - arxiv.org
This study investigates the onset of linear instabilities and their later nonlinear interactions in
the shear layer of an initially-laminar jet using a combination of stability analysis and data …