[HTML][HTML] A review on turbulent flow over rough surfaces: Fundamentals and theories
Surface roughness can significantly influence the fluid dynamics and heat transfer in
convective flows by inducing perturbations in the velocity profile which affect surface drag …
convective flows by inducing perturbations in the velocity profile which affect surface drag …
Scientific multi-agent reinforcement learning for wall-models of turbulent flows
HJ Bae, P Koumoutsakos - Nature Communications, 2022 - nature.com
The predictive capabilities of turbulent flow simulations, critical for aerodynamic design and
weather prediction, hinge on the choice of turbulence models. The abundance of data from …
weather prediction, hinge on the choice of turbulence models. The abundance of data from …
Wall turbulence at high friction Reynolds numbers
A new direct numerical simulation of a Poiseuille channel flow has been conducted for a
friction Reynolds number of 10 000, using the pseudospectral code LISO. The mean …
friction Reynolds number of 10 000, using the pseudospectral code LISO. The mean …
Machine learning building-block-flow wall model for large-eddy simulation
A Lozano-Durán, HJ Bae - Journal of Fluid Mechanics, 2023 - cambridge.org
A wall model for large-eddy simulation (LES) is proposed by devising the flow as a
combination of building blocks. The core assumption of the model is that a finite set of simple …
combination of building blocks. The core assumption of the model is that a finite set of simple …
Linear-model-based study of the coupling between velocity and temperature fields in compressible turbulent channel flows
C Cheng, L Fu - Journal of Fluid Mechanics, 2023 - cambridge.org
It is generally believed that the temperature and the velocity fields are highly coupled in
compressible wall-bounded turbulence. In the present study, we employ a linear model, ie …
compressible wall-bounded turbulence. In the present study, we employ a linear model, ie …
Non-equilibrium three-dimensional boundary layers at moderate Reynolds numbers
Non-equilibrium wall turbulence with mean-flow three-dimensionality is ubiquitous in
geophysical and engineering flows. Under these conditions, turbulence may experience a …
geophysical and engineering flows. Under these conditions, turbulence may experience a …
Causality of energy-containing eddies in wall turbulence
Turbulent flows in the presence of walls may be apprehended as a collection of momentum-
and energy-containing eddies (energy-eddies), whose sizes differ by many orders of …
and energy-containing eddies (energy-eddies), whose sizes differ by many orders of …
Self-critical machine-learning wall-modeled LES for external aerodynamics
A Lozano-Durán, HJ Bae - arXiv preprint arXiv:2012.10005, 2020 - arxiv.org
The prediction of aircraft aerodynamic quantities of interest remains among the most
pressing challenges for computational fluid dynamics. The aircraft aerodynamics are …
pressing challenges for computational fluid dynamics. The aircraft aerodynamics are …
Cause-and-effect of linear mechanisms sustaining wall turbulence
A Lozano-Durán, NC Constantinou… - Journal of Fluid …, 2021 - cambridge.org
Despite the nonlinear nature of turbulence, there is evidence that part of the energy-transfer
mechanisms sustaining wall turbulence can be ascribed to linear processes. The different …
mechanisms sustaining wall turbulence can be ascribed to linear processes. The different …
Effect of wall boundary conditions on a wall-modeled large-eddy simulation in a finite-difference framework
HJ Bae, A Lozano-Durán - Fluids, 2021 - mdpi.com
We studied the effect of wall boundary conditions on the statistics in a wall-modeled large-
eddy simulation (WMLES) of turbulent channel flows. Three different forms of the boundary …
eddy simulation (WMLES) of turbulent channel flows. Three different forms of the boundary …