Hemodynamic analysis of pulsatile blood flow in a complete bypass graft with different anastomois angles

The uid ow through a bypass graft of 100% stenosed artery can substantially in uence the outcome of bypass surgery. To help improve our understanding of this and related issues, unsteady ows for Newtonian/non-Newtonian uids using Carreauʹs shear thinning model are numerically simulated in an arterial bypass system with complete occluded host artery. The objective of this study is to deal with the in uence of the non-Newtonian property of uid, eect of dierent bypass-host artery angle , and ow pulsatility on ow conguration, Wall Shear Stress (WSS), Oscillatory Shear Index (OSI), and ow phenomena during the pulse cycle. Here we use  = 30, 45, 60 and 75 to study the eect of geometry. It is found that  has strong in uence on hemodynamic in distal femoral artery anastomoses. Results show that a bypass femoral anastomosis with a moderate , like  = 45, enhances its long-term performance. Also, signicant dierence between the non-Newtonian and Newtonian pulsatile ows is revealed. This shows the necessity of using non-Newtonian model rather than Newtonian model for such ows. The unsteadiness of ow using the femoral pulse shows complex ow characteristics, and requires the use of unsteady analysis