Figure 2.

(a) Generation process of the hybrid mesh: first, an internal cylinder is created inside the geometrical model and discretized using hexahedral elements (top); second, the region between the cylinder and the arterial wall is meshed with tetrahedral mesh obtaining the final grid (bottom). (b) Example of a cross section of the proximal region of case A characterized by the hybrid mesh. Hexahedral elements are clearly visible in the core region of the section. Tetrahedral elements are present in the external regions and they are smaller near the wall and the stent struts. It is possible to notice that the top stent struts are in contact with the arterial wall while the bottom struts are malapposed. A magnification of the tetrahedral mesh around two malapposed struts is shown in the box. (Online version in colour.)