Development and Validation of Multiphase Model in an Idealized Right Coronary Artery
摘要
Blood is a complex fluid in which flexible particles such as red blood cells, white blood cells and platelets are suspended in plasma. Most of the studies in the literature consider blood as a single phase and successfully capture several features of the flow. However, some specific features such as distribution of red blood cells in an arterial segment can only be captured by considering blood to be a multiphase system. In this work, we employ the Euler–Euler approach to model the flow of blood in an idealized right coronary artery and validate the model by comparing it with existing numerical results. CFD simulations are performed in ANSYS Fluent 19 using Euler–Euler multiphase modeling approach. In the simulations two phases are considered—plasma (continuous phase) and RBCs (disperesed phase). RBCs are considered to be non-Newtonian. To account for the pulsatile nature of blood flow, a transient velocity profile is applied at the inlet. The volume fraction of RBCs at the inlet is specified to be 0.45. Zero-gauge pressure boundary condition is applied at the outlet. The RBC velocity distribution is investigated at a cross-sectional plane at the bend. Qualitatively, the velocity distribution at diastole matches with literature. But at systole, the maximum of the velocity is slightly shifted toward the outer wall in the present study.