Pulsatile Non-Newtonian Laminar Blood Flows through Arterial Double Stenoses

Abstract EN

The paper presents a numerical investigation of non-Newtonian modeling effects on unsteady periodic flows in a two-dimensional (2D) pipe with two idealized stenoses of 75% and 50% degrees, respectively.

The governing Navier-Stokes equations have been modified using the Cartesian curvilinear coordinates to handle complex geometries.

The investigation has been carried out to characterize four different non-Newtonian constitutive equations of blood, namely, the (i) Carreau, (ii) Cross, (iii) Modified Casson, and (iv) Quemada models.

The Newtonian model has also been analyzed to study the physics of fluid and the results are compared with the non-Newtonian viscosity models.

The numerical results are represented in terms of streamwise velocity, pressure distribution, and wall shear stress (WSS) as well as the vorticity, streamlines, and vector plots indicating recirculation zones at the poststenotic region.

The results of this study demonstrate a lower risk of thrombogenesis at the downstream of stenoses and inadequate blood supply to different organs of human body in the Newtonian model compared to the non-Newtonian ones.