Numerical simulations of unsteady flows in a stenosed coronary bypass graft

被引:49
作者
Deplano, V [1 ]
Bertolotti, C [1 ]
Boiron, O [1 ]
机构
[1] Technopole Chateau Gombert, Lab Biomecan Cardiovasc, Marseille, France
关键词
coronary bypass; physiological flow; three-dimensional numerical modelling; wall shear stress; stenosis;
D O I
10.1007/BF02345372
中图分类号
TP39 [计算机的应用];
学科分类号
081203 [计算机应用技术]; 0835 [软件工程];
摘要
Using the finite element method, physiological blood flows through a three-dimensional model of a coronary graft are numerically analysed. The model includes a stenosis shape in the host artery upstream from the anastomosis. Recirculating areas, secondary flows, wall shear stress (WSS) and spatial wall shear stress gradients (WSSGs) are studied for different flow repartitions and at different times in the cycle. The temporal and spatial evolutions of the recirculating areas downstream from the stenosis, their interactions with the flow issued from the graft and their associated WSSs highlight that the presence of the stenosis in the recipient artery is essential for prediction of the evolution of a grafting at the beginning of its implantation. The areas downstream from the stenosis expansion, non-existent for a host artery without stenosis, are submitted to low and oscillating WSS between -0.5 and 0N m(-2). The stagnation point on the recipient artery floor is subjected to high positive and negative WSSG(nd) values, and its location is dependent on the residual flow through the stenosis.
引用
收藏
页码:488 / 499
页数:12
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