Numerical and experimental models of post-operative realistic flows in stenosed coronary bypasses

By means of both experimental and finite element methods, we simulated thre e-dimensional unsteady flows through coronory bypass anastomosis. The host artery includes a stenosis shape located at two different distances of graf ting. The inflow rates are issued ti-om in vivo measurements in patients wh o had undergone coronary bypass surgery a few days before. We provide a com parison between experimental and numerical velocity profiles coupled with t he numerical analysis of spatial and temporal wall shear stress evolution. The interaction between the graft and coronary flows has been demonstrated. The phase inflow difference can partly be responsible for specific flow ph enomena: jet deflection towards a preferential wall or feedback phenomenon that causes the flapping of the post-stenotic jet during the cardiac cycle. In conclusion, we showed the sensitivity of these typical flows to distanc e of grafting, inflows waveforms but also to their phase difference. (C) 20 01 Elsevier Science Ltd. All rights reserved.