217 citations · 868 across the 46 of their papers we have counts for
11 papers · 1 filter
Synchronization of turbulence in channel flow
Mengze Wang, Tamer A. Zaki
Synchronization of turbulence in channel flow is investigated using continuous data assimilation. The flow is unknown within a region of the channel. Beyond this region the velocit…
Simulations of turbulence over compliant walls
Amir Esteghamatian, Joseph Katz, Tamer A. Zaki
Direct numerical simulations of turbulent flow in a channel with one rigid and one viscoelastic wall are performed. An Eulerian-Eulerian model is adopted with a level-set approach…
Vorticity amplification in viscoelastic channel flows with long-wave surface distortions
Jacob Page, Tamer A. Zaki
Surface distortions to an otherwise planar channel flow introduce vorticity perturbations. We examine this scenario in viscoelastic fluids, and identify new mechanisms by which sig…
Ensemble-variational assimilation of statistical data in large eddy simulation
Vincent Mons, Yifan Du, Tamer A. Zaki
A non-intrusive data assimilation methodology is developed to improve the statistical predictions of large-eddy simulations (LES). The ensemble-variational (EnVar) approach aims to…
From limited observations to the state of turbulence: Fundamental difficulties of flow reconstruction
Tamer A. Zaki, Mengze Wang
Numerical simulations of turbulence provide non-intrusive access to all the resolved scales, although they often invoke idealizations that can compromise realism. In contrast, expe…
A Lagrangian relaxation towards equilibrium wall model for large eddy simulation
Mitchell Fowler, Tamer A. Zaki, Charles Meneveau
A large eddy simulation wall model is developed based on a formal interpretation of quasi-equilibrium that governs the momentum balance integrated in the wall-normal direction. The…
From wall observations to turbulence: The difficulty of flow reconstruction
Qi Wang, Mengze Wang, Tamer A. Zaki
Estimation of the initial state of turbulent channel flow from spatially and temporally resolved wall data is performed using adjoint-variational data assimilation. The accuracy of…
Optimization of a Moving Sensor Trajectory for Observing a Point Scalar Source in Turbulent Flow
Constantinos F. Panagiotou, Davide Cerizza, Tamer A. Zaki +1
We propose a strategy for optimizing a sensor trajectory in order to estimate the time dependence of a localized scalar source in turbulent channel flow. The approach leverages the…
DeepONet prediction of linear instability waves in high-speed boundary layers
P. Clark Di Leoni, L. Lu, C. Meneveau +2
Deep operator networks (DeepONets) are trained to predict the linear amplification of instability waves in high-speed boundary layers and to perform data assimilation. In contrast…
Evolutional Deep Neural Network
Yifan Du, Tamer A. Zaki
The notion of an Evolutional Deep Neural Network (EDNN) is introduced for the solution of partial differential equations (PDE). The parameters of the network are trained to represe…
Concave-wall turbulent boundary layers without and with free-stream turbulence
Jiho You, David A. Buchta, Tamer A. Zaki
Direct numerical simulations are performed to contrast turbulent boundary layers over a concave wall without and with free-stream turbulence. Adverse pressure gradient near the ons…