Survey of machine-learning wall models for large-eddy simulation

A Vadrot, XIA Yang, M Abkar - Physical Review Fluids, 2023 - APS
This survey investigates wall modeling in large-eddy simulations (LES) using data-driven
machine-learning (ML) techniques. To this end, we implement three ML wall models in an …

Data-enabled recalibration of the Spalart–Allmaras model

Y Bin, G Huang, XIA Yang - AIAA Journal, 2023 - arc.aiaa.org
We use experimental and simulation data to recalibrate the standard Spalart–Allmaras
model. Free-shear flow, the buffer layer, the log layer, and flows with adverse pressure …

Differentiable turbulence ii

V Shankar, R Maulik, V Viswanathan - arXiv preprint arXiv:2307.13533, 2023 - arxiv.org
Differentiable fluid simulators are increasingly demonstrating value as useful tools for
developing data-driven models in computational fluid dynamics (CFD). Differentiable …

[HTML][HTML] Progressive augmentation of Reynolds stress tensor models for secondary flow prediction by computational fluid dynamics driven surrogate optimisation

MJ Rincón, A Amarloo, M Reclari, XIA Yang… - International Journal of …, 2023 - Elsevier
Generalisability and the consistency of the a posteriori results are the most critical points of
view regarding data-driven turbulence models. This study presents a progressive …

On the benefits and limitations of echo state networks for turbulent flow prediction

MS Ghazijahani, F Heyder… - Measurement …, 2022 - iopscience.iop.org
The prediction of turbulent flow by the application of machine learning (ML) algorithms to big
data is a concept currently in its infancy which requires further development. It is of special …

Log-law recovery through reinforcement-learning wall model for large eddy simulation

A Vadrot, XIA Yang, HJ Bae, M Abkar - Physics of Fluids, 2023 - pubs.aip.org
This paper focuses on the use of reinforcement learning (RL) as a machine-learning (ML)
modeling tool for near-wall turbulence. RL has demonstrated its effectiveness in solving high …

[HTML][HTML] Constrained re-calibration of two-equation Reynolds-averaged Navier–Stokes models

Y Bin, X Hu, J Li, SJ Grauer, XIA Yang - Theoretical and Applied Mechanics …, 2024 - Elsevier
Abstract Machine-learned augmentations to turbulence models can be advantageous for
flows within the training dataset but can often cause harm outside. This lack of …

[HTML][HTML] An Investigation of LES Wall Modeling for Rayleigh–Bénard Convection via Interpretable and Physics-Aware Feedforward Neural Networks with DNS

A Wang, XIA Yang… - Journal of the Atmospheric …, 2024 - journals.ametsoc.org
The traditional approach of using the Monin–Obukhov similarity theory (MOST) to model
near-surface processes in large-eddy simulations (LESs) can lead to significant errors in …

A priori screening of data-enabled turbulence models

PES Chen, Y Bin, XIA Yang, Y Shi, M Abkar, GI Park - Physical Review Fluids, 2023 - APS
Assessing the compliance of a white-box turbulence model with known turbulent knowledge
is straightforward. It enables users to screen conventional turbulence models and identify …

Progressive augmentation of turbulence models for flow separation by multi-case computational fluid dynamics driven surrogate optimization

A Amarloo, MJ Rincón, M Reclari, M Abkar - Physics of Fluids, 2023 - pubs.aip.org
In the field of data-driven turbulence modeling, the consistency of the a posteriori results and
generalizability are the most critical aspects of new models. In this study, we combine a multi …