Abstract
It was reported that the flow pattern in a model of aneurysms were complicated. In this study, the flow pattern in the aneurysms was obtained roughly comparison of the results in thought which were conjectured the flow pattern in the plane cut by a laser light sheet with the visualization experiment. This conjecture was done in considering possible next part for the fluid which exist at the specified part to flow down by dividing some planes into two or four parts. The visualization results nearly agree with those obtained by this conjec ture. Therefore this conjecture is effective as to the visualization about these complicated flows.