Recently, the intravascular therapy using microcoils and stents to treat aneurysms has
attracted researcher’s interest. In this study, in order to evaluate the effects of the stents, a numerical
simulation of two-dimensional flows has been carried out for a pipe with a model of an aneurismal
sac. Using aneurismal models with different inclined angles to the pipe, inflow conditions with
steady states or pulsations have been applied in the range of Reynolds number in human blood
flows. First, the computational results are compared with experiments under the steady inflow
condition, which has shown the reliability of the numerical simulation. Furthermore, the mechanism
of flows with an aneurismal model is discussed in the case with or without a stent, and consequently
the effect of the stent is clarified.