  As the first endeavour, we have analyzed the pulsatile flow of Oldroyd-B
viscoelastic fluid where the combined effects of fluid elasticity and pulsation
parameters on the flow characteristics are numerically studied at a low
Reynolds number. Computations are performed using a finite-volume based
open-source solver OpenFOAM by appending the log-conformation tensor approach
to stabilize the numerical solution at high Deborah number. Significant flow
velocity enhancement is achieved by increasing the viscoelastic behaviour of
the fluid. High-velocity gradient zones and high polymeric stress regions are
observed near the channel wall. The magnitude of axial velocity attenuates with
increasing pulsation amplitude or pulsation frequency, and the extent of this
attenuation is highly dependent on the Deborah number or the retardation ratio.
This work finds application in the transport of polymeric solutions, extrusion,
and injection moulding of polymer melts in several process industries.
