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 …

In this numerical and theoretical work, we study the turbulent channel flow of Newtonian and
elastoviscoplastic fluids. The coherent structures in these flows are identified by means of …

In this work we study the influence of fluid viscoelasticity on the performance of lubricated
contacts in the presence of cavitation. Several studies of viscoelastic lubricants have been …

Lubricants can exhibit significant viscoelastic effects due to the addition of high molecular
weight polymers. The overall behavior of the mixture is vastly different from a simpler …

Lubrication is essential to minimize wear and friction between contacting surfaces in relative
motion. Oil based lubricants are often enhanced via polymer additives to minimize self …

We have performed direct numerical simulation of the turbulent flow of a polymer solution in
a square duct, with the FENE-P model used to simulate the presence of polymers. First, a …

Direct numerical simulations are carried out to study the effect of finite Weissenberg number
up to. The incompressible flow equations are coupled with the evolution equation for the …

The flow of three non-Newtonian fluids, comprising polymer and surfactant additives, in a
periodically constricted tube (PCT) are experimentally compared. The radius of the tube …

Drag reduction (DR) in plane Couette flow (PCF) induced by the addition of flexible
polymers has been studied via direct numerical simulation (DNS). The similarities and …

Interface-resolved direct numerical simulations are performed to examine the combined
effects of soluble surfactant and viscoelasticity on the structure of a bubbly turbulent channel …