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Influence of Inlet Secondary Curvature on Hemodynamics in Subject-Specific Model of Carotid Bifurcations  

Lee, Sang-Wook (School of Mechanical Engineering, University of Ulsan)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.31, no.5, 2011 , pp. 479-486 More about this Journal
Abstract
In image-based CFD modeling of carotid bifurcation hemodynamics, it is often not possible (or at least not convenient) to impose measured velocity profiles at the common carotid artery inlet. Instead, fully-developed velocity profiles are usually imposed based on measured flow rates. However, some studies reported a pronounced influence of inflow boundary conditions that were based on actual velocity profiles measured by magnetic resonance imaging which showing the unusual presence of a high velocity band in the middle of the vessel during early diastole inconsistent with a Dean-type velocity profile. We demonstrated that those velocity profiles were induced by the presence of modest secondary curvature of the inlet and set about to test whether such more "realistic" velocity profiles might indeed have a more pronounced influence on the carotid bifurcation hemodynamics. We found that inlet boundary condition with axisymmetric fully-developed velocity profile(Womersley flow) is reasonable as long as sufficient CCA inlet length of realistic geometry is applied.
Keywords
Hemodynamics; Carotid Bifurcation; Secondary Curvature; Inlet Boundary Condition; Wall Shear Stress; Computational Fluid Dynamics; Magnetic Resonance Imaging;
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