[HTML][HTML] A review on turbulent flow over rough surfaces: Fundamentals and theories

M Kadivar, D Tormey, G McGranaghan - International Journal of …, 2021 - Elsevier
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 …

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 …

Wall turbulence at high friction Reynolds numbers

S Hoyas, M Oberlack, F Alcántara-Ávila… - Physical Review …, 2022 - APS
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 …

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 …

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 …

Non-equilibrium three-dimensional boundary layers at moderate Reynolds numbers

A Lozano-Durán, MG Giometto, GI Park… - Journal of Fluid …, 2020 - cambridge.org
Non-equilibrium wall turbulence with mean-flow three-dimensionality is ubiquitous in
geophysical and engineering flows. Under these conditions, turbulence may experience a …

Causality of energy-containing eddies in wall turbulence

A Lozano-Durán, HJ Bae, MP Encinar - Journal of Fluid Mechanics, 2020 - cambridge.org
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 …

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 …

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 …

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 …