The objective of the present study is to carry out CFD simulations in a realistic 3D geometry of two coronary stents in physiological conditions and to assess the influence of the non-Newtonian behavior of blood, modeled as Casson fluid. The stents used are made of 12 rings and are similar to real coronary ones. Artery is modeled as a cylinder with rigid walls and the blood is assumed as incompressible non-Newtonian fluid in laminar flow. A commercial computational fluid dynamic code is used with a mesh composed of non uniform tetrahedrons. The simulations are performed in steady and unsteady state. Wall Shear Stress, as well as its time variations and the non-Newtonian behavior, are investigated in unsteady state. Results suggest that the Newtonian behavior is leading to an overestimation of the restenosis percent.

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