710 citations · 1.6k across the 23 of their papers we have counts for
9 papers · 1 filter
Exact coherent states for grooved Couette flows
Sabarish Vadarevu, Ati Sharma, Bharathram Ganapathisubramani
Recent progress indicates that highly symmetric recurring solutions of the Navier-Stokes equations, such as equilibria and periodic orbits, provide a skeleton for turbulence dynami…
Scaling and interaction of self-similar modes in models of high-Reynolds number wall turbulence
A S Sharma, R Moarref, B J McKeon
Previous work has established the usefulness of the resolvent operator that maps the terms nonlinear in the turbulent fluctuations to the fluctuations themselves. Further work has…
Estimation of unsteady aerodynamic forces using pointwise velocity data
F. Gómez, A. S. Sharma, H. M. Blackburn
A novel method to estimate unsteady aerodynamic force coefficients from pointwise velocity measurements is presented. The methodology is based on a resolvent-based reduced-order mo…
A reduced-order model of three-dimensional unsteady flow in a cavity based on the resolvent operator
F Gómez, HM Blackburn, M Rudman +2
A novel reduced-order model for nonlinear flows is presented. The model arises from a resolvent decomposition in which the nonlinear advection terms of the Navier-Stokes equation a…
Steady streamwise transpiration control in turbulent pipe flow
F Gómez, HM Blackburn, M Rudman +2
A study of the the main features of low- and high amplitude steady streamwise wall transpiration applied to pipe flow is presented. The effect of the two transpiration parameters,…
On the design of optimal compliant walls for turbulence control
M. Luhar, A. S. Sharma, B. J. McKeon
This paper employs the theoretical framework developed by Luhar et al. (J. Fluid Mech., 768, 415-441) to consider the design of compliant walls for turbulent skin friction reductio…
On the correspondence between Koopman mode decomposition, resolvent mode decomposition, and invariant solutions of the Navier-Stokes equations
Ati S. Sharma, Igor Mezić, Beverley J. McKeon
The relationship between Koopman mode decomposition, resolvent mode decomposition and exact invariant solutions of the Navier-Stokes equations is clarified. The correspondence rest…
Adjoint-based Optimal Flow Control for Compressible DNS
J. Javier Otero, Ati S. sharma, Richard D. Sandberg
A novel adjoint-based framework oriented to optimal flow control in compressible direct numerical simulations is presented. Also, a new formulation of the adjoint characteristic bo…
Passivity-Based Output-Feedback Control of Turbulent Channel Flow
Peter H. Heins, Bryn Ll. Jones, Ati S. Sharma
This paper describes a robust linear time-invariant output-feedback control strategy to reduce turbulent fluctuations, and therefore skin-friction drag, in wall-bounded turbulent f…