EFFECT OF FLUID SOLID INTERACTION IN AXISYMMETRIC CAROTID ARTERY STENOSIS

High blood pressure, severe stenosis and stiffened plaque make fluid–structure interaction (FSI) plays an intensive role in simulating blood flow in stenotic arteries. This work is concerned with the study of plaque severity and stiffness effects on arterial hemodynamic parameters in models of atherosclerotic carotid arteries using fluid-solid interaction (FSI). The parameters include blood flows, pressure drop, wall shear stress, wall stress concentration and deformation. The investigation is done with the aid of finite element method for solving the structure and TDMA and SIMPLE methods in CFD for the fluid domain solution using ANSYS software. To overcome the software inconsistency in FSI mode, a new mathematical program is designed using incremental boundary iteration method. A linear elasticity approach is implemented in modeling the arterial wall and Navier- Stokes equations govern the fluid domain. Minimum structural deformation, high pressure drop and high shear stress at the throat of the stenosis, flow recirculation and low shear stress just distal to the stenoses were observed under physiological conditions. Critical condition is determined due to severity variations which may lead to thrombus formation and possible plaque rupture. To illustrate the accuracy of proposed method, the results are compared with published experimental and numerical.

کلیدواژه ها:

Stenosis ، Blood Flow ، Fluid Solid Interaction ، Plaque rupture ، Finite Element method