Elasto-inertial turbulence

Y Dubief, VE Terrapon, B Hof - Annual Review of Fluid …, 2023 - annualreviews.org
The dissolution of minute concentration of polymers in wall-bounded flows is well-known for
its unparalleled ability to reduce turbulent friction drag. Another phenomenon, elasto-inertial …

Exact coherent states and the nonlinear dynamics of wall-bounded turbulent flows

MD Graham, D Floryan - Annual Review of Fluid Mechanics, 2021 - annualreviews.org
Wall-bounded turbulence exhibits patterns that persist in time and space: coherent
structures. These are important for transport processes and form a conceptual framework for …

Perspectives on viscoelastic flow instabilities and elastic turbulence

SS Datta, AM Ardekani, PE Arratia, AN Beris… - Physical Review …, 2022 - APS
Viscoelastic fluids are a common subclass of rheologically complex materials that are
encountered in diverse fields from biology to polymer processing. Often the flows of …

[HTML][HTML] Turbulent drag reduction by polymer additives: Fundamentals and recent advances

L Xi - Physics of Fluids, 2019 - pubs.aip.org
A small amount of polymer additives can cause substantial reduction in the energy
dissipation and friction loss of turbulent flow. The problem of polymer-induced drag …

Understanding viscoelastic flow instabilities: Oldroyd-B and beyond

HAC Sánchez, MR Jovanović, S Kumar… - Journal of Non …, 2022 - Elsevier
The Oldroyd-B model has been used extensively to predict a host of instabilities in shearing
flows of viscoelastic fluids, often realized experimentally using polymer solutions. The …

Exact traveling wave solutions in viscoelastic channel flow

J Page, Y Dubief, RR Kerswell - Physical Review Letters, 2020 - APS
Elasto-inertial turbulence (EIT) is a new, two-dimensional chaotic flow state observed in
polymer solutions with possible connections to inertialess elastic turbulence and drag …

Continuous pathway between the elasto-inertial and elastic turbulent states in viscoelastic channel flow

M Khalid, V Shankar, G Subramanian - Physical Review Letters, 2021 - APS
Viscoelastic plane Poiseuille flow is shown to become linearly unstable in the absence of
inertia, in the limit of high elasticities, for ultradilute polymer solutions. While inertialess …

The centre-mode instability of viscoelastic plane Poiseuille flow

M Khalid, I Chaudhary, P Garg, V Shankar… - Journal of Fluid …, 2021 - cambridge.org
A modal stability analysis shows that plane Poiseuille flow of an Oldroyd-B fluid becomes
unstable to a 'centre mode'with phase speed close to the maximum base-flow velocity,. Our …

Critical-layer structures and mechanisms in elastoinertial turbulence

A Shekar, RM McMullen, SN Wang, BJ McKeon… - Physical review …, 2019 - APS
Simulations of elastoinertial turbulence (EIT) of a polymer solution at low Reynolds number
are shown to display localized polymer stretch fluctuations. These are very similar to …

Viscoelastic pipe flow is linearly unstable

P Garg, I Chaudhary, M Khalid, V Shankar… - Physical review …, 2018 - APS
Newtonian pipe flow is known to be linearly stable at all Reynolds numbers. We report, for
the first time, a linear instability of pressure-driven pipe flow of a viscoelastic fluid, obeying …