Numerical Evaluation of Stenosis Effects on Hemodynamics and Shear Stress through Curved Artery

In the present investigation, the numerical simulation of steady and Newtonian flows in S-shaped bends with sweep angle of 45º is performed at Reynolds number of 300. It is examined blood flow in a model of the femoral artery with and without obstruction to simulate conditions, which are common in arterial disease. The impact of both conditions on the flow behavior are evaluated and found significant differences in the two models. Hemodynamic characteristics such as secondary flow, vorticity, and axial velocity profiles are analyzed thoroughly. It is noted that the combinedeffects of stenosis and curvature on flow characteristics are also investigated. The results indicate that inner regions with high wall shear stress values are vulnerable sites to the initiation and development of thrombus formation lesions which leads to stroke. The results have demonstrated that the formation of shear stress by the stenotic region is higher than by curved tube without stenosis. The probability of flow separation as one ofthe important flow features contributing to the onset of arterial wall diseases is studied. It is worthy to mention that the model was created in Solid Work 10 (geometry creation). Subsequently it was imported into Cosmos software package and a structured hexahedral mesh was applied to the geometry and governing equations are solved

کلیدواژه ها:

hemodynamics ، blood ، wall shear stress