M. Navidbakhsh and M.R. Naghavi (Iran)
Non-Newtonian flow; CFD Simulation; Carotid Artery Bifurcation; Atherosclerosis.
From clinical practice, it is known that the carotid artery bifurcation is a zone where the flux is strongly perturbed, and is sensitive to the development of atherosclerotic lesions. In this work the computerized simulation of the hemodynamic behavior of non-Newtonian blood flow in the 3D model of carotid artery bifurcation with 3 different apex angle and varying mass flow rates at the entrance of CCA, using CFD method is studied. A considerable approach toward the realistic physiological conditions, such as applying the shear thinning behavior of viscoelastic blood flow by employing Carreau-Yasuda model in a practical geometry has been made. It is observed that the lesions might be appeared at the apex of the bifurcation junction and represents a risk factor by modification the blood flow pattern, flow separation, recirculation regions and wall shear stress gradients. Also sites within the carotid artery that experience low and oscillating shear stress namely the posterior wall of carotid sinus in ICA, are more likely to develop atherosclerotic plaque which could lead to stroke.
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