Comparison of Newtonian and Non-Newtonian Blood Flow through Arterial Stenosis

M. Moshkelani, S. Gh. Etemad, and A. Moheb (Iran)

Keywords

Numerical simulations, Flow separation, Wall shearstress, Stenosis, Non-Newtonian, Pulsatile blood flow

Abstract

Stenosis in arteries of mammals is a common occurance and hemodynamics factors play a significant role in the formation and proliferation of this disease. In this study a 3-D model of physiological pulsatile, laminar blood flow through Carotid artery with rigid wall and axisymmetric stenosis in the case of 75% area reduction is developed. Blood is assumed to have Newtonian and non-Newtonian behavior. The usual Cauchy, continuity and power law equations (in the case of non-Newtonian model) are solved using finite volume technique. Flow features, such as velocity profiles, flow separation zones and wall shear stress distributions in poststenotic region are presented. According to obtained results, there are flow separation zones and vortex formation in poststenotic region. In pulsatile model reverse flows are strong but vortices are weak, also in non-Newtonian case secondary flow and vortices become stronger than Newtonian case. The results show good agreement with previous studies and analytical calculations.

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