64 citations · 305 across the 12 of their papers we have counts for
8 papers · 1 filter
Extension of QSQH theory of scale interaction in near-wall turbulence to all velocity components
Sergei Chernyshenko
The QSQH theory is extended to all three velocity components taking into account the fluctuations of the direction of the large-scale component of the wall friction. This effect is…
Global stability of fluid flows despite transient growth of energy
Federico Fuentes, David Goluskin, Sergei Chernyshenko
Verifying nonlinear stability of a laminar fluid flow against all perturbations is a central challenge in fluid dynamics. Past results rely on monotonic decrease of a perturbation…
Turbulent skin-friction reduction by wavy surfaces
Sacha Ghebali, Sergei I. Chernyshenko, Michael A. Leschziner
Direct numerical simulations of fully-developed turbulent channel flows with wavy walls are undertaken. The wavy walls, skewed with respect to the mean flow direction, are introduc…
Relationship between the methods of bounding time averages
Sergei Chernyshenko
The problem of finding bounds of time-averaged characteristics of dynamical systems, such as the bound on the mean energy dissipation rate in a turbulent flow governed by incompres…
Sum-of-Squares approach to feedback control of laminar wake flows
Davide Lasagna, Deqing Huang, Owen R. Tutty +1
A novel nonlinear feedback control design methodology for incompressible fluid flows aiming at the optimisation of long-time averages of flow quantities is presented. It applies to…
Drag reduction by a solid wall emulating spanwise oscillations. Part 1
Sergei Chernyshenko
A new idea for turbulent skin-friction reduction is proposed, wherein the shape of the solid wall is designed to create the spanwise pressure gradient acting similarly to the well-…