A FSI Simulation of Thromboembolism in Carotid Artery Bifurcation: Roles of Bifurcation Dividing Angle on Arterial Hemodynamics

Document Type : Research Article

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Abstract

Although embolism is important as a major cause of brain infarction, little information is available about the hemodynamic factors governing the path large emboli tend to follow. In this research, we simulated embolus movement in three carotid artery bifurcations, each of them having different dividing angles. Y-shaped geometries were investigated. The governing equations for blood flow are the Navier-Stokes formulations. In this paper, the phenomenon was modeled under laminar and Newtonian flow conditions. The measured stress-strain curve obtained from Ultrasound elasticity imaging of thrombus was set to the Sussman-Bathe material model for embolus material properties. Shear stresses in the inner wall of the internal carotid artery (ICA) were measured. High magnitude of wall shear stress (WSS) in the areas in which embolus and artery are in contact with each other was observed. Stress in the embolus was also calculated and areas prone to rapture were identified.

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