Fig. 3

Visualized flow patterns at peak systole in two cutting planes with a 40% opaque surface of model A (a) and model B (b). The black circles correspond to vortex cores and the red arrows point to the recirculating zones with slow flow due to flow separation at the blebs. The two ruptured aneurysms (models A2 & B2) present a feature of complex unstable flow patterns with multiple vortices and one recirculation zone at the blebs, while models A1 and B1 (unruptured) show relatively simple stable flows with a single vortex