Hemodynamic analysis of coronary artery bypass grafting with elastic walls and different stenoses

Abstract

In this study, hemodynamic analysis of a complete coronary bypass graft with elastic walls and different percentages of stenosis was carried out numerically. Blood flow was considered Newtonian and unsteady. The objective of this study was to deal with the effect of the wall elasticity, flow pulsatility, and stenosis percentage on the flow configuration, Wall Shear Stress (WSS), and rotational flows. By comparing the rigid and elastic wall results of WSS, it was found that WSS had lower values for the toe, heel, and bed of the host vessel under bifurcation in the elastic mode, which was closer to reality. Moreover, it was found that upon increasing the stenosis percentage, the occurrence possibility of rotational flow would increase. The maximum and minimum values for WSS were observed at a stenosis of 70%. From the pulsatility of flow, unsteady flow exhibited more accurate results and also, velocity and WSS were of lower values than the steady state results.