Abstract
In this paper, in order to investigate movement of Red Blood Cells (RBCs) toward the centre area of blood vessels CFD modeling is done. Subjects of this study are a sample of arteriole vessel with 8 mm inside diameter without any branch (1st model) and another vessel which has 8 mm inside diameter, with a side branch by 2 mm inside diameter (2nd model). In 1st model, four different inlet velocities are applied to see the effect of boundary condition on wall shear stress and volume fraction. The multiphase model is extended to include the blood rheological properties at low shear rates that present the non-Newtonian CFD model. In addition, Eulerian multiphase CFD approach is adopted for describing the hemodynamic of blood flows. The migration and segregation of red blood cells in disturbed flow regions are evaluated. This behavior of blood was attributed to flow-dependent interactions of RBCs in blood flow. Moreover, the effect of inlet velocity on RBCs aggregation and WSS is clearly recognizable from results. This two-phase hemodynamic analysis may have application to study those kinds of vascular diseases which are dealing with RBCs change in size and shape with in vivo complex flow conditions.
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