Numerical investigation of pulsed flow in aortic aneurism with and without stent by lattice Boltzmann method

Abstract

Endovascular treatment of aortic aneurysms with an endoprosthesis is proposed for the prevention of the aneurysms' rupture risk and clogging of blood vessels. This paper aims to study the impact of stents with different porosities, placed in fusiform aortic aneurysms, on the hemodynamic parameters: velocity and shear rate of the flow inside the aneurysms, using pulsed boundary conditions derived from real measurements. The numerical investigations are performed with the Lattice Boltzmann method. The blood is treated as a Newtonian fluid and then as a non- Newtonian fluid with the Carreau-Yasuda and Cross models. The reduction obtained by a single stent is modest and unfavorable to thrombotic occlusion. Overlapping of several stents is proposed to promote occlusion. The results found show good agreement with medical theory.