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 …

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 …

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 …

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 …

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 …

The Oldroyd-B fluid has become the starting point for almost all complex flow calculations
and analysis involving the behavior of dilute polymer solutions. The reasons for this are …

Turbulence generally arises in shear flows if velocities and hence, inertial forces are
sufficiently large. In striking contrast, viscoelastic fluids can exhibit disordered motion even at …

A modal stability analysis shows that pressure-driven pipe flow of an Oldroyd-B fluid is
linearly unstable to axisymmetric perturbations, in stark contrast to its Newtonian counterpart …

Dissolving small amounts of polymer into a Newtonian fluid can dramatically change the
dynamics of transitional and turbulent flows. We investigate the spatiotemporal dynamics of …