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 …

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 …

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 …

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 …

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 …

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 …

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 …

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 …

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 …

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 …