توصيفگر ها :
رگ داراي گرفتگي , جريان ضرباني , برهم كنش جامد_ سيال , ديواره الاستيك , مدل كارئو
چكيده انگليسي :
Abstract
Cardiovascular disease is one of the major causes of death in many countries. One of the most
common of these diseases is arteriosclerosis, which is caused by accumulation of lipid in the
artery wall. In this thesis, the effect of 75% stenosis of the actual model of the neck carotid artery
with elastic and rigid walls is investigated. The Carreue model is used to model non-newtonian
blood behavior, and the results are compared with the results of the newtonian blood model.
Laminar pulsatile blood flow is considered and simulation of one-way FSI and two-way FSI are
used in ANSYS software. According to results, maximum blood velocity and wall shear stress of
the stenosed artery is more than 3 times greater than the healthy artery, and changes of velocity
and wall shear stress in the elastic artery are less than the rigid artery. The elastic artery has more
pressure in the systolic phase and less pressure in the diastolic phase. Reducing systolic pressure
and increasing diastolic pressure is a consequence of arteriosclerosis. The back flow and the
separation zone of the rigid artery are less in the systolic phase and more in the diastolic phase,
and the reverse pressure gradient does not occur in the rigid artery. stenosis cause increasing wall
shear and von-mises stress, pressure drop, delaying separation, decreasing back flow in diastolic
phase and increasing back flow in systolic phase. Therfore, stenosis disrupt the circulation
system. The Carreue model is a suitable model for predicting blood behavior at low shear rates,
but at high shear rates, the behavior is similar to the newtonian fluid.
